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8.1. SR 03-18-2013 E1kkREQUEST FOR ACTION River TO ITEM NUMBER Mayor and City Council 8.1 AGENDA SECTION MEETING DATE PREPARED BY General Business March 18,2013 Justin Femrite,City Engineer ITEM DESCRIPTION REVIEWED By Resolution Adopting Wastewater Treatment Facility Plan Gary Leirmoe, Chief Operator REVIEWED BY Suzanne Fischer, COD Director ACTION REQUESTED Adopt by motion the attached resolution to formally adopt the attached Wastewater Facility Plan and approves the submittal of it to the Minnesota Pollution Control Agency (MPCA). BACKGROUND/DISCUSSION As authorized on March 19,2012,Bolton and Menk, Inc. has prepared the attached Facility Plan which details current and future wastewater loads and treatment options for the Wastewater Treatment Facility. Representatives from Bolton&Menk, Inc.will be at the City Council meeting to present the findings of the plan. ATTACHMENTS • Wastewater Treatment Facility Plan • Resolution Action Motion by Second by Vote Follow Up rIVERED If r NATURE RESOLUTION 13- A RESOLUTION OF THE CITY OF ELK RIVER A RESOLUTION TO ADOPT A WASTEWATER TREATMENT FACILITY PLAN FOR SUBMISSION TO THE MINNESOTA POLLUTION CONTROL AGENCY WHEREAS, The City Council of the City of Elk River recognizes the need to modernize and update its Wastewater Treatment methods and has identified future capacity problems of its existing Wastewater Treatment Facility,and WHEREAS, Bolton&Menk,Inc. has been retained as Consulting Engineers to prepare a Wastewater Treatment Facility Plan for the purpose of submitting such plan to the Minnesota Pollution Control Agency,and NOW THEREFORE, BE IT RESOLVED,by the City Council in and for the City of Elk River, Minnesota as follows: 1. The City Council does hereby adopt the proposed Elk River Wastewater Treatment Facility Plan as presented by Bolton&Menk,Inc. as Consulting Engineers. 2. That the appropriate city Officials are hereby authorized and directed to submit the city's Wastewater Treatment Facility Plan to the Minnesota Pollution Control Agency for review and approval. Passed and adopted this 18th day of March 2013. John J. Dietz,Mayor ATTEST: Tina Allard, City Clerk N:\Public Bodies\City Council\Council RCA\Agenda Packet\03-18-2013\Resolution-FacPlan.docx BOLTON M E N K , I NCB Consulting Engineers & Surveyors WASTEWATER TREATMENT FACILITY PLAN Elk River CITY OF ELK RIVER MINNESOTA BMI PROJECT N0. T21.104758 FEBRUARY 2013 Wastewater Treatment Facility Plan for Elk River, Minnesota I hereby certify that this plan, specification, or report was prepared by me or under my direct supervision, and that I am a duly Licensed Professional Engineer under the laws of the State of Minnesota. . R By: fir � Seth Peterson, P.E. License No. 26468 Date: February 28, 2013 TABLE OF CONTENTS SECTION 1.0 INTRODUCTION 1.1 Purpose......................................................................................................................1 1.2 Report Organization...................................................................................................I SECTION 2.0 DESIGN CONSIDERATIONS AND PARAMETERS 2.1 Planning Period..........................................................................................................2 2.2 Planning Area.............................................................................................................2 2.3 Customer/User Projections.........................................................................................3 2.4 Wastewater Flows......................................................................................................4 2.4.1. Historical Flows..............................................................................................4 2.4.2. Projected Wastewater Flows...........................................................................5 2.5 Wastewater Loadings.................................................................................................6 2.5.1. Historical Wastewater Loadings......................................................................6 2.5.2. Projected Wastewater Loadings......................................................................6 2.6 Effluent Discharge Limits...........................................................................................8 SECTION 3.0 EVALUATION OF EXISTING WASTEWATER TREATMENT FACILITIES 3.1 General......................................................................................................................9 3.2 Liquid Treatment Process...........................................................................................9 3.2.1. Screening........................................................................................................9 3.2.2. Flow Measurement.........................................................................................9 3.2.3. Grit Removal................................................................................................10 3.2.4. Primary Clarifiers..........................................................................................10 3.2.5. Trickling Filters............................................................................................10 3.2.6. Aeration Basin..............................................................................................11 3.2.7. Final Clarifiers..............................................................................................11 3.2.8. Filters...........................................................................................................11 3.2.9. Disinfection..................................................................................................11 3.2.10. Electrical/Controls........................................................................................12 3.3 Biosolids Treatment Process ....................................................................................12 3.3.1. Anaerobic Digestion.....................................................................................12 3.3.2. Biosolids Storage Tank.................................................................................14 SECTION 4.0 WASTEWATER TREATMENT FACILITY IMPROVEMENTS 4.1 General....................................................................................................................16 4.1.1. Optimum Operation/Expansion of Existing Facilities.....................................16 4.1.2. Regionalization.............................................................................................16 4.1.3. Construction of a New Facility......................................................................16 4.2 Wastewater Treatment Facility Improvements—Liquid Process................................17 4.2.1. Design Option No. 1.....................................................................................17 4.2.1.1. Screening..................................................................................................17 City of Elk River,Minnesota T12.104758 Page i Wastewater Treatment Facility Plan Prepared by Bolton&Menk,Inc. 4.2.1.2. Flow Measurement............... .............17 ........................................................ 4.2.1.3. Grit Removal............................................................................................17 4.2.1.4. Primary Clarifiers......................................................................................18 4.2.1.5. Trickling Filters.........................................................................................18 4.2.1.6. Activated Sludge Process..........................................................................18 4.2.1.7. Final Clarifiers...........................................................................................19 4.2.1.8. Filters........................................................................................................20 4.2.1.9. Disinfection...............................................................................................20 4.2.1.10. Electrical/Controls ..................................................................................20 4.2.2. Design Option No. 2.....................................................................................20 4.2.2.1. Screening..................................................................................................21 4.2.2.2. Flow Measurement....................................................................................21 4.2.2.3. Grit Removal ............................................................................................21 4.2.2.4. Primary Clarifiers......................................................................................21 4.2.2.5. Trickling Filters.........................................................................................22 4.2.2.6. Activated Sludge Process..........................................................................22 4.2.2.7. Final Clarifiers...........................................................................................23 4.2.2.8. Filters........................................................................................................23 4.2.2.9. Disinfection...............................................................................................24 4.2.2.10. Electrical/Controls ..................................................................................24 4.3 Biosolids Treatment Process ....................................................................................24 4.3.1. Pump to Great River Energy (GRE) .............................................................24 4.3.2. Expansion of Existing Anaerobic Digestion System.......................................25 4.3.3. Heat Drying..................................................................................................26 4.3.4. Regionalization.............................................................................................26 SECTION 5.0 COST ESTIMATE 5.1 GENERAL ..............................................................................................................27 5.2 LIQUID STREAM IMPROVEMENTS...................................................................27 5.3 BIOSOLIDS HANDLING IMPROVEMENTS........................................................29 5.3.1. Pump to Great River Energy (GRE) .............................................................29 5.3.2. Heat Drying..................................................................................................29 5.3.3. Regionalization.............................................................................................30 SECTION 6.0 RECOMMENDATIONS AND IMPLEMENTATION 6.1 Recommended Wastewater Treatment Improvements...............................................31 6.2 Project Funding........................................................................................................32 6.2.1. Bonding........................................................................................................32 6.2.2. Assessment...................................................................................................32 6.2.3. State Revolving Fund Loan (PFA)................................................................32 6.2.4. Other Funding Mechanisms...........................................................................33 6.3 Allocation and Impact on User Fees.........................................................................33 6.4 Implementation Schedule .........................................................................................34 City of Elk River,Minnesota T12104758 Page ii Wastewater Treatment Facility Plan Prepared by Bolton&Menk,Inc. LIST OF TABLES 2.1 User Projections...................................................................................................3 2.2 Average Daily Flows ...........................................................................................4 2.3 Summary of Projected Flows................................................................................5 2.4 Historical Wastewater Loadings ..........................................................................6 2.5 Projected Design Loadings...................................................................................7 2.6 Summary of Design Parameters............................................................................7 2.7 Effluent Discharge Limits.....................................................................................8 3.1 Digestion Facilities.............................................................................................13 3.2 Evaluation of Existing Treatment Units Summary..........................................14-15 5.1 Preliminary Cost Estimates for Liquid Stream Improvements..............................28 5.2 Preliminary Cost Estimate for Great River Energy Biosolids Option ...................29 5.3 Preliminary Cost Estimate for Heat Drying Biosolids Option ..............................30 5.4 Preliminary Cost Estimate for Regionalization Biosolids Option..........................30 6.1 Preliminary Cost Estimate for Recommended Improvements ..............................32 6.2 Wastewater User Rates ......................................................................................34 6.3 Implementation Schedule....................................................................................34 LIST OF FIGURES 2.1 Urban Service Area.................................................................................Follows 2 2.2 Future Development within the Urban Service Area.................................Follows 2 2.3 Future Development outside the Urban Service Area...............................Follows 2 2.4 Historical Flow Data ...............................................................................Follows 4 3.1 Existing Site Plan ........................................................ ..........................Follows 9 4.1 Proposed Site Plan Design Option No. 1 ...............................................Follows 17 4.2 Process Flow Diagram Design Option No. 1..........................................Follows 17 4.3 Proposed Site Plan Design Option No. 2 ...............................................Follows 20 4.4 Biosolids Process Flow Diagram for Great River Energy Option............Follows 25 4.5 Biosolids Process Flow Diagram for Heat Drying Option.......................Follows 26 City of Elk River,Minnesota T12104758 Page iii Wastewater Treatment Facility Plan Prepared by Bolton&Menk,Inc. APPENDICES Appendix A Projected Flow Calculations Appendix B National Pollutant Discharge Elimination System(NPDES) Permit MN 0020788 Appendix C Significant Industrial User Agreements Appendix D Public Hearing Presentation Material, Notice and Publication, and Comments Appendix E SERP Mailing List Appendix F Signed Resolution Adopting Facility Plan Appendix G Ordinances Appendix H Environmental Information Worksheet (EIW) City of Elk River,Minnesota T12.104758 Page iv Wastewater Treatment Facility Plan Prepared by Bolton&Menk,Inc. SECTION 1.0 INTRODUCTION 1.1 Purpose The City of Elk River owns and operates a mechanical wastewater treatment facility serving the residents of Elk River as well as commercial and industrial users within the community. The wastewater treatment facility was originally constructed in 1977 and has gone through several upgrades since. The current draft of the National Pollutant Discharge Elimination System/State Disposal System (NPDES/SDS) for this facility includes new discharge limitations. As a result of the new permit limits and projected increased loads, the treatment facility must be evaluated. The purpose of this report is to evaluate the capacity of the existing facility and the ability to reliably achieve the reduced effluent limits at design flows and loads and develop a plan for plant modifications. The design flow and load projections presented in this report are consistent with the City's vision of anticipated residential and industrial growth. This report is intended to provide the City of Elk River with a basis for facility improvements required to serve the projected growth through a 20-year planning period based on the limits in the current Draft NPDES permit. 1.2 Report Organization To address the treatment facility evaluation the report is organized into the following sections: Section 1: Introduction Section 2: Design Considerations and Parameters Section 3: Evaluation of Existing Treatment Facilities Section 4: Wastewater Treatment Facility Improvements Section 5: Cost Estimate Section 6: Recommendations and Implementation City of Elk River—T12.104758 Page I Wastewater Treatment Facility Plan Prepared by Bolton&Menk,Inc. SECTION 2.0 DESIGN CONSIDERATIONS AND PARAMETERS 2.1 Planning Period Wastewater treatment facilities are typically designed based on a 20-year planning period as it is generally not feasible to make numerous changes in the capacity of a wastewater treatment facility. In addition, a 20-year planning period is required for the project to be eligible for funding assistance with the Public Facilities Authority (PFA). A design year of 2035 is used for this evaluation with population projection being the primary basis of the design criteria. Projected wastewater flows and loadings are determined using a combination of population trends and expected commercial and industrial growth. 2.2 Planning Area The City of Elk River has a land area of approximately 28,000 acres within the city limits. A land use analysis was done by the city, which divided the city into areas based on intended use. The City has also delineated the area into either rural areas or the urban service area. The City provides water and sewer services to residents within the urban service area. Figure 2.1 shows the City map of the urban service area. Within the urban service area there are three areas that are not connected to the sanitary sewer system and one area which has a mixture of sewer hook-ups and individual septic systems. The urban service area has regions of various acreage and different land use classifications that are not currently developed. A plan for future development was established after discussions with the City staff. It is the City of Elk River's belief that urban service area will be fully developed in the next 20 years and that additional land areas will be added to the urban service area. Figure 2.2 shows area that has not been developed within the urban service area while Figure 2.3 shows areas that the City intends to add to the urban service area. City of Elk River—T12.104758 Page 2 Wastewater Treatment Facility Plan Prepared by Bolton&Menk,Inc. 2 k ]EE- Fz _ / ® } § % � § 2 ,7 \ a w / 2 2 & ; ) 2 C-4 \ o « L e § © e ® v . 2 e . p ' .- —— --— .—.-------. .---.--. ' r ) p - —• / � s! � | \A - Z | y - | | : 22 / .■ � | m � • : . � r ® / . A o . � p � � 2 v ® e § p .0 £ # . G p LL E N b z N w E N Q O E E E = a = c N N N 3 E o 3 s _ E m 3 E H (D ^` LL U) v ao Ln ®® 99 M N ®® ��10 ®®® = Iv N t0 v R ® N � ® �\� I R i -All � r N�N ®al N � B M 1 9 r N o •_ u �® u m d M o ®� ®o C 21 L6 r® a n � g R Lnt0 V N R El t0 � t0 J n R i � � J N .'LLZb'L E L6X'n'p Sale. pxw'Llxll ewtl aauaS uegi.uiy1�M luawtlolana.awln j BSLb6L\stley�R153\BSLb6LLZ1WJll3\sib\yanias�iy\1'IUawnaoO tley� 1 INK C: _ CD CL I � s R IN RES, RRION • — 3'x I R= ' e 1 f \ N. � I+'• s.a� Inn �� ,01ktiiL•tllL� �.�fi�� I � �� I1 _ I - E sm I o\\ oo\\\\ ,\ \\\ �\o\\�� .oo 1■ � x as w 2.3 Customer/User Projections Several methods exist which are used to predict population trends for cities such as Elk River. Historical city and county population trends are reviewed. Mathematical projections can be performed including arithmetic, geometric, and linear regression methods. Often, a combination of methods, along with local intuition and State Demographic data are involved in any sort of future population estimate. The City of Elk River only serves a portion of its total population for sanitary sewer needs. Therefore, the number of users was projected based on land use within the urban service area and areas intended to be added to urban service area for the design year 2035. To project the number of users for various land use classifications, the standard user/acre or flow/acre was used. Table 2.1 shows various assumptions used and the projected number of users for the design year 2035 for the urban service area and outside the urban service area. Table 2.1 User Projections Elk River Wastewater Treatment Facility Urban Service Area Population Projection Outside of the Urban Service Area Population Projection Residential Area Residential Area Acres 1,016 Acres 462 Houses/Acre 2* Houses/Acre 2* People/House 2.82* People/House 2.82* Users 5,731 Users 2,605 Light Industrial Area Light Industrial Area Acres 223 Acres 499 d/Acre 1,000 d/Acre 1,000 Equivalent Users 2,231 Equivalent Users 4,992 Highway Business Commercial Area Acres 316 d/Acre 1,200* Equivalent Users 3,796 High Density Residential Area (Apartments) High Density Residential Area A artments Acres 52 Acres 74 d/Acre 1,500* d/Acre 1,500* Equivalent Users 773 Equivalent Users 1,106 Total Users 12,531 Total Users 8,703 *Assumed Value City of Elk River T12.104758 Page 3 Wastewater Treatment Facility Plan Prepared by Bolton&Menk,Inc. 2.4 Wastewater Flows 2.4.1. Historical Flows The Elk River Wastewater Treatment Facility (WWTF) records flows to the facility by a parshall flume. The daily total values are recorded each day along with precipitation received on Discharge Monitoring Reports (DMR). These recorded flows are used to evaluate current flow trends and develop future flow projections. A summary of average daily and monthly flows to the WWTF for 2006 to 2011 are presented in Table 2.2. The historical flow variation data is shown in Figure 2.4. Average yearly flows vary significantly during this period showing seasonal affects. Average monthly flows spike briefly during spring and summer months each year. This type of flow pattern indicates inflow and infiltration (I & I) into the collection system. I & I flows are heavily influenced by seasonal and precipitation events and are present in essentially all gravity collection systems. From the observed historical data, the Average Dry Weather (ADW) flow is 1.142 MGD and the Average Wet Weather (AWW) flow is 1.302 MGD yielding an AWW/ADW ratio of 1.14. Table 2.2 Average Daily Flows Elk River Wastewater Treatment Facility Monthly 2006 2007 2008 2009 2010 2011 Average Month (gallons) (gallons) (gallons) (gallons) (gallons) (gallons) (gallons) January 1,532,516 1,190,516 1,204,903 1,214,065 1,222,903 1,200,323 1,260,871 February 1,329,286 1,193,286 1,209,897 1,176,214 1,215,536 1,195,000 1,219,870 March 1,310,645 1,166,516 1,216,581 1,346,774 1,199,129 1,225,484 1,251,688 April 1,019,000 1,173,133 1,291,500 1,506,767 1,176,067 1,181,000 1,224,578 May 1,116,774 1,162,258 1,249,774 1,454,387 1,158,032 1,223,548 1,227,462 June 1,071,533 1,189,867 1,239,367 1,236,167 1,206,933 1,206,333 1,191,700 July 1,116,774 1,161,677 1,162,806 1,126,903 1,190,677 1,244,226 1,167,177 August 986,097 1,179,806 1,165,194 1,137,677 1,190,677 1,275,355 1,155,801 September 1,014,367 1,186,667 1,196,267 1,183,700 1,194,367 1,198,367 1,162,289 October 1,040,935 1,216,000 1,173,226 1,187,516 1,166,032 1,147,419 1,155,188 November 1,057,367 1,190,967 1,152,700 1,155,667 1,188,433 1,117,733 1,143,811 December 1,113,839 1,188,839 1,226,226 1,191,097 1,159,032 1,112,968 1,165,333 Yearly Average 1,142,428 1,183,294 1,211,120 1,243,078 1,188,985 1,193,980 1,193,814 City of Elk River—T12.104758 Page 4 Wastewater Treatment Facility Plan Prepared by Bolton&Menk,Inc. C13 ti ti c 2� �O �� C7 C15 m� a� � o I GC ,Q t 3 LL o p � E � 3 r o 00 � O�v� ao O � O 1 � T m� O� O O O O O O O O O O O O U� O O U� O N N c-I -1 O O awy 'mold 2.4.2. Projected Wastewater Flows Future wastewater flows were estimated using user projections based on land use classifications. The Ten States Standard of 100 gallons per capita per day was used in projection of flows. The wastewater flows were projected for two design options. Design Option No. 1 = Urban Service Area Only Design Option No. 2 = Urban Service Area& Outside Developments From here onward the above two options will be referred to as "Design Option No. 1" and "Design Option No. 2" in this report. The ADW flow for the design year 2035 was calculated by adding the existing flow to flow from projected areas of developments and flow from un-sewered connections. The AWW flows were projected using an AWW/ADW flow ratio of 1.14. Peak Hourly Wet Weather (PHWW) flows were calculated by multiplying AWW flows by a peaking factor of 1.60, which was calculated from existing flow data. To calculate Peak Instantaneous Wet Weather (PIWW) flow the peaking factor was increased by 25 percent to provide a peaking factor of 2.0. Detailed calculations for flow projections are provided in Appendix A. A summary of projected flows is given in Table 2.3 for both design options. Table 2.3 Summary of Projected Flows Elk River Wastewater Treatment Facility Design Option No. 1 Design Option No. 2 ADW MGD 3.11 ADW MGD 3.98 AWW MGD 3.55 AWW MGD 4.54 PHWW MGD 5.68 PHWW MGD 7.27 PIWW MGD 7.10 PIWW MGD 9.08 City of Elk River—T12.104758 Page 5 Wastewater Treatment Facility Plan Prepared by Bolton&Menk,Inc. 2.5 Wastewater Loadings 2.5.1. Historical Wastewater Loadings The historical wastewater loading data was taken from DMR's submitted to the MPCA. The City records influent loading data for the Five Day Carbonaceous Biochemical Oxygen Demand (CBOD5), Total Suspended Solids (TSS) and Phosphorous. Influent loadings for years 2006 through 2011 are presented in Table 2.4. Table 2.4 Historical Wastewater Loadings Elk River Wastewater Treatment Facility Year 2006 2007 2008 2009 2010 2011 Average Flow,MGD 1.142 1.183 1.211 1.243 1.189 1.194 1.194 CBOD5 mg/1 336 273 268 270 261 313 286 lbs/day 3198 2691 2704 2794 2585 3117 2848 lbs/ca ita/da 0.28 0.23 0.22 0.22 0.22 0.26 0.24 TSS Mg/1 170 127 170 140 154 237 156 lbs/day 1623 1253 1083 1449 1528 2359 1549 lbs/ca ita/da 0.14 0.11 0.09 0.12 0.13 0.20 0.13 Phosphorous Mg/1 7.3 6.9 6.3 6.6 6.8 6.9 6.8 lbs/day 69 68 64 68 68 68 67 lbs/capita/day 0.006 0.006 0.005 0.005 0.006 0.006 0.006 2.5.2. Projected Wastewater Loadings Typical loading rates provide by Ten States Standards for normal domestic strength wastewater range from 0.17-0.22 lb CBOD5/capita/day and 0.20-0.25 lb TSS/capita/day. Recommendations for total phosphorus and total Kjeldahl nitrogen(TKN) by Metcalf and Eddy in Wastewater Engineering- Treatment and Reuse are 0.009 lb P/capita/day and 0.03 lb TKN/capita/day. City of Elk River—T12.104758 Page 6 Wastewater Treatment Facility Plan Prepared by Bolton&Menk,Inc. Therefore, the following loading rates were used based on historical analysis and standard rates: CBOD5 =0.241b/capita/day TSS =0221b/capita/day Phosphorus =0.0061b/capita/day TKN =0.031b/capita/day Based on the above loading rates, total loadings were developed for the design year for both design options. The total design loadings are shown in Table 2.5 while a summary of design flows and loadings for both options is presented in Table 2.6. Table 2.5 Projected Design Loadings Elk River Wastewater Treatment Facility Parameter Design Option Design Option No. 1 No. 2 CBODS lbs/day 8,518 10,899 TSS, lbs/day 7,808 9,990 Phosphorous, lbs/day 213 273 TKN, lbs/day 1,065 1,362 Table 2.6 Summary of Design Parameters Elk River Wastewater Treatment Facility Parameter Design Option No. 1 Design Option No. 2 Average Daily Flow ADF 3.11 MGD 3.98 MGD Average Wet Weather Flow (AWW) 3.55 MGD 4.54 MGD Peak Hourly Wet Weather Flow PHWW 5.68 MGD 7.27 MGD Peak Instant Wet Weather Flow PIWW 7.10 MGD 9.08 MGD CBOD5 8,518 lbs/day 10,899 lbs/da TSS 7,808 lbs/day 9,990 lbs/da Phosphorous 213 lbs/day 273 lbs/da TKN 1,065 lbs/day 1,362 lbs/da City of Elk River—T12.104758 Page 7 Wastewater Treatment Facility Plan Prepared by Bolton&Menk,Inc. 2.6 Effluent Discharge Limits A summary of the effluent discharge limits for the Elk River WWTF is presented in Table 2.7. The complete permit is included in Appendix B. As shown, current limits do not include a phosphorus limit. However, the next permit that will be issued in 2013 will include a phosphorus limit. Therefore, design considerations in this report will take into account the affects of chemical phosphorus removal on the existing and future processes. Table 2.7 Effluent Discharge Limits Elk River Wastewater Treatment Facility Parameter Limit Units Limit Type CBODS 25 mg/1 Calendar Month Average Fecal Coliform 200 #/100m1 Calendar Month Geometric Mean Mercury, Total as H 6.9 n 1 12 Month Moving Average H 6.0-9.0 SU Calendar Month Average Phosphorus, Total as P 1 mg/1 Calendar Month Average Total Suspended Solids 30 mg/1 Calendar Month Average City of Elk River—T12.104758 Page 8 Wastewater Treatment Facility Plan Prepared by Bolton&Menk,Inc. SECTION 3.0 EVALUATION OF EXISTING WASTEWATER TREATMENT FACILITIES 3.1 General This section evaluates the existing wastewater treatment facility and its ability to treat the proposed design flows and loadings. Any problems with the existing equipment will also be discussed. The overall wastewater treatment facility is best evaluated by analyzing each of the main process units and their respective treatment capacities. The current process consists of screening, vortex grit removal, primary clarifiers, trickling filters, final clarifiers, sand filters, ultraviolet (UV) disinfection, and anaerobic sludge digestion and storage. The existing site plan is presented in Figure 3.1. The current rated capacity as stated in the NPDES permit is 2.2 MGD (AWW) and a CBOD5 loading of 200 mg/L. In this report, the existing treatment processes are evaluated to handle the requirements of hydraulic and organic loadings for Design Option No. 1 and No. 2. 3.2 Liquid Treatment Process 3.2.1. Screening Wastewater enters the treatment facility and flows through two mechanical bar screens. The screens are installed in 2 1/2 foot wide by 3 foot deep channels. Each screen has a capacity of 7.00 MGD with a clear opening of 3/4 inch. Each screen is redundant to the other in case of mechanical breakdown. The existing screens would meet the design requirements for Design Option No. 1, but would need modifications to meet the requirements for Design Option No. 2. 3.2.2. Flow Measurement Following the screens, wastewater flows through a parshall flume for flow measurement. The existing parshall flume has a 12-inch throat width with a maximum flow measurement capacity of 10.4 MGD. The existing parshall flume would meet the flow measurement requirements for both Design Options. City of Elk River—T12.104758 Page 9 Wastewater Treatment Facility Plan Prepared by Bolton&Menk,Inc. ri X X X X X 0 - pZ N NFpF Mo pN — O 1 I 3 \ FUZ ' Z � a� rNVi W NOLLtltl3tl 1', at �� XII 1 / ZEE- rz X11 �WW i 1 ¢p V '� ❑p �-- �� wp z- - in m �m �w �Nlanlne IYJIW3H� Y. �� 3.2.3. Grit Removal Following flow measurement, wastewater flows to the vortex grit removal process. The existing grit tank is an exterior tank located just east of the Headworks Building. The existing grit tank has a 10 foot diameter and a side water depth of 11 1/2 feet. The maximum capacity of the existing grit removal system is 7.0 MGD with a bypass inplace for peak instantaneous flows. The grit settled at the bottom of the tank is pumped to a grit classifier, where grit is further washed before it is discharged into a dumpster for disposal. The existing grit removal process would meet the requirements for Design Option No. I and No. 2. 3.2.4. Primary Clarifiers Following grit removal, wastewater flows to a splitter structure where it is evenly split between two primary clarifiers. The existing primary clarifiers are each 40 feet in diameter with a side water depth of 9 feet. Maximum AWW flow and PHWW flow of each clarifier are 1.25 MGD and 1.51 MGD, respectively. The combined maximum AWW and PHWW flows are 2.50 MGD and 3.02 MGD, respectively. The existing clarifiers do not meet AWW and PHWW flow requirements for Design Options No. I and No. 2. In Addition, the existing collection mechanism in both primary clarifiers is in need of replacement due to their age. 3.2.5. Trickling Filters Following the primary clarifiers, wastewater flows to the trickling filter pump station where it is pumped to the top of the trickling filters. The existing filters consist of two trickling filters that are each 26 feet deep with a 45 foot diameter. The top 2 feet of media is a cross flow type while the bottom 24 feet is a vertical flow type plastic media. The specific surface area of the media is 30 square feet per cubic foot. Each trickling filter has a two-arm distributor to evenly apply wastewater on the media. City of Elk River—T12.104758 Page 10 Wastewater Treatment Facility Plan Prepared by Bolton&Menk,Inc. Maximum hydraulic and organic loading capacity of each trickling filter is 1.43 MGD and 3,308 lbs CBOD5/day, respectively. When the filters are run in parallel the total hydraulic and organic loading rates are 2.86 MGD and 6,616 lbs/day, respectively. 3.2.6. Aeration Basin The existing aeration basin is 40 feet by 20 feet with a side water depth of 12 feet. The tank was built in 1994 with an adjacent blower building and was intended to be used as a future aeration tank. However, aeration diffusers and blowers were never installed and the tank has never been put into service. 3.2.7. Final Clarifiers From the trickling filters wastewater flows to the final clarifier splitter structure where flow is evenly split to three final clarifiers. The existing clarifiers are 50 feet in diameter with a side water depth of 16 feet. Using the Ten States Standard of 900 gpd/ft2 at Peak Hourly Flow, maximum capacity of each clarifier is 1.76 MGD (PHWW). The combined total PHWW flow capacity of all three final clarifiers is 5.28 MGD. The existing facility is 0.40 MGD short in capacity for Design Option No. 1 and 1.99 MGD short in capacity for Design Option No. 2. 3.2.8. Filters After final clarification, wastewater flows to the gravity sand filters. The existing facility has six (6) gravity sand filters with a total design flow of 7.0 MGD. Each filter is 12 feet by 20 feet with a surface area of 240 square feet. Each filter has 10 inches of silica sand filter media placed directly over the underdrains. The filtration system has two low pressure air wash blowers. Each blower has a 3.0 HP motor with a capacity of 300 scfin at 3.0 psi. 3.2.9. Disinfection Following the filters wastewater flows to the Disinfection Building for final treatment. The facility uses ultraviolet (UV) light for effluent wastewater disinfection. The UV building has two channels, one equipped with UV equipment for current treatment and City of Elk River—T12.104758 Page 11 Wastewater Treatment Facility Plan Prepared by Bolton&Menk,Inc. one for future needs. The existing system is designed for an AWW flow of 1.1 MGD and a PHWW flow of 3.0 MGD. The existing UV system was designed based on the following wastewater characteristics. TSS 30 mg/L BOD 25 mg/L UV Transmittal @ 253.7 nm, 65% 50% Effluent Standard 200/100 ML For both Design Option No. 1 and No. 2, the existing UV disinfection system would need upgrades to meet disinfection requirements. 3.2.10. Electrical/Controls The current controls system at the Elk River WWTF does not include a central control system to operate the entire facility. Each treatment unit has its own control system that is not tied into the control systems of the other treatment units. The existing controls system is in fine working conditions, but it is not user friendly. Upgrades to the control system would be beneficial for Design Options No. 1 and No. 2. 3.3 Biosolids Treatment Process Biosolids produced during the treatment process are collected in the final and primary clarifiers. From the final clarifiers the biosolids are transferred by gravity to the primary clarifiers for thickening. The biosolids are wasted from the primary clarifiers using progressive cavity pumps with a capacity of 100 gpm. The biosolids treatment process includes one primary and one secondary anaerobic digester and a biosolids storage tank. The capacity of the existing processes is discussed below. 3.3.1. Anaerobic Digestion The existing anaerobic digestion system includes one completely mixed primary digester and a secondary digester which is used for biosolids and gas holding. Sizes and capacities of the digesters are present in Table 3.1. City of Elk River—T12.104758 Page 12 Wastewater Treatment Facility Plan Prepared by Bolton&Menk,Inc. Table 3.1 Digestion Facilities Elk River Wastewater Treatment Facility Primary Digester Secondary Digester Diameter, ft 55 35 SWD, ft 20 19.5 Volume, ft' 47,460 18,700 gallons 355,000 140,000 Temperature, °F 98 Ambient Biosolids Concentrations, % 1-4 2 The digestion process reduces both the total biosolids volume and the amount of pathogens and vectors found in the biosolids, resulting in biosolids of less quantity and better quality. The anaerobic digester capacities are determined by Volatile Suspended Solids (VSS) loading and minimum time and temperature requirements. For completely mixed digesters, a loading rate of 80 lb VSS/1,000 ft3 is allowed. A minimum detention time of 15 days is required to meet the US EPA 503 regulations for Class B biosolids. From the existing data, the concentration of biosolids wasted to the primary digester is 1.9 percent solids with a VSS content of 85 percent. If the solids are continuously wasted at the above mentioned characteristics the maximum capacity of the primary digester would be 23,700 gallons per day. To run the primary digester at the maximum volatile solids loading rate, the City would need to thicken the influent sludge to 2.25 percent solids. At a concentration of 2.25 percent solids concentration the primary digester can process 4,470 lbs/day of biosolids. The estimated biosolids production rate for Design Option No. 1 and No. 2 are 13,400 lbs/day and 17,150 lbs/day, respectively. Based upon the future loadings the City would need to expand the biosolids handling facilities. City of Elk River T12.104758 Page 13 Wastewater Treatment Facility Plan Prepared by Bolton&Menk,Inc. 3.3.2. Biosolids Storage Tank After digestion, the biosolids are transferred to an unheated storage tank. The existing biosolids storage tank has two basins with a total volume of 700,000 gallons. The biosolids are thickened in the storage tank to further reduce the volume and stored until land application. A summary of the evaluation of the various unit processes at the Elk River WWTF is presented in Table 3.2. Table 3.2 Evaluation of Existing Treatment Units Summary Elk River Wastewater Treatment Facility 2035 Design Requirement Unit Process Existing Notes Facility USA Only USA+ Outside Preliminary Treatment Screen 7.0 MGD 7.09 MGD 9.08 MGD Grit Removal 7.0 MGD 7.09 MGD 9.08 MGD Flow Measurement(Parshall Flume) 10.4 MGD 7.09 MGD 9.08 MGD 12"throat Primary Clarifiers Number 2 Diameter, ft 40 SWD, ft 9 Max AWWA Capacity(Total) 2.50 MGD 3.55 MGD 4.54 MGD Max PHWW Capacity(Total) 3.76 MGD 5.68 MGD 7.27 MGD Trickling Filter Number 2 Diameter, ft 45 SWD, ft 26 Media Plastic Top 2' cross flow& bottom 24' vertical flow Total Max Hydraulic Capacity 2.86 MGD 5.68 MGD 7.27 MGD Total Max Organic Capacity 6616 lbs/day In parallel operation Aeration Tank Volume Needed,MG 1.8 2.6 Final Clarifiers Number 3 Diameter, ft 50 SWD, ft 16 Max PHWW Capacity/Clarifier 1.76 MGD Total Max Capacity 5.28 MGD 5.68 MGD 7.27 MGD City of Elk River—T12.104758 Page 14 Wastewater Treatment Facility Plan Prepared by Bolton&Menk,Inc. Table 3.2 Continued Evaluation of Existing Treatment Units Summary Elk River Wastewater Treatment Facilit Filters Number 6 Size, ft x ft 12 x 20 Area, ft' 240 Media Silica Sand Media Depth,inches 10 Total Max Capacity 7.0 MGD 5.68 MGD 7.27 MGD UV Disinfection No. of Channels 1 Capacity can double with installation of UV Max PHWW Capacity 3.0 MGD 5.67 MGD 7.26 MGD equipment in the existing spare channel Primary Digester Diameter, ft 55 Depth, ft 20 Volume,gallons 355,000 Capacity,lbs dry solids/day 4,470 13,400 17,150 Secondary Digester Diameter, ft 35 Depth, ft 19.5 Volume,gallons 140,000 Biosolids Storage Number 1 (with two basins) Volume,gallons 700,000 Volume, ft' 93,583 Dry Solids Production,lbs/day 2,377 13,400 17,150 Dry Solids Production After Anaerobic Digestion,lbs/day 1,379 5,363 6,863 Number of Days of Storage for Digested Sludge,at 2% Solids 84.7 17.8 13.9 3% Solids 127.0 26.7 20.8 Storage capacity should 4% Solids 169.4 35.5 27.8 be a minimum of 180 5% Solids 211.7 44.4 34.7 days. 6% Solids 254.1 53.3 41.7 City of Elk River—T12.104758 Page 15 Wastewater Treatment Facility Plan Prepared by Bolton&Menk,Inc. SECTION 4.0 WASTEWATER TREATMENT FACILITY IMPROVEMENTS 4.1 General In the following paragraphs, several categories of alternatives are given general consideration. Potentially feasible alternatives will be further evaluated. Generally, alternative solutions include: 1) optimum operation and/or expansion of existing facilities; 2) regionalization; 3) construction of a new facility. 4.1.1. Optimum Operation/Expansion of Existing Facilities The existing facility has operated successfully at loads that have exceeded the current rated organic treatment capacity. The existing facility operations can be modified or expanded to meet the treatment levels required. 4.1.2. Regionalization This category includes the possibility of diverting wastewater from the City to a wastewater treatment facility of a nearby community. Due to the distance associated with regionalizing in comparison to the magnitude of the required plant expansion, regionalization was not considered feasible at this time. 4.1.3. Construction of a New Facility The current facility is a mechanical treatment facility with continuous discharge including a main lift station, mechanical screen, primary clarifiers, chemical feed, final clarifiers, sand filters, UV disinfection, and biosolids facilities. The plant has received upgrades over the years with the most recent upgrade done in 2005. Most of the plant components are in excellent condition. At this time, it is not feasible to abandon the existing treatment facility and construct a new facility as many of the unit processes are in good condition and can be utilized to meet the proposed design flows and loadings. The recommended improvements discussed are then based on optimization and expansion of the existing facility. City of Elk River—T12.104758 Page 16 Wastewater Treatment Facility Plan Prepared by Bolton&Menk,Inc. 4.2 Wastewater Treatment Facility Improvements — Liquid Process Based on the design flows and loadings presented in Section 2, liquid stream process improvements have been developed for both design options. A detailed discussion of the needed improvements for both design conditions is given below. 4.2.1. Design Option No. 1 Detailed descriptions of the improvements for each unit process for Design Option No. 1 are presented in the following sections. A site plan with the needed improvements is present in Figure 4.1 and an updated process flow diagram is presented in Figure 4.2. 4.2.1.1. Screening Ten States Standards states that the capacity of the screens should meet the design peak instantaneous flow with one unit out of service. By these criteria the screening process is 0.10 MGD short of capacity for Design Option 1. The existing screening process was installed in 2005 during the Headworks Improvements Project. Due to the age and capacity of the existing screening process, it is recommended that the City revaluate the screening process when the peak flows to the facility reaches 90% of the capacity of the existing screens. 4.2.1.2. Flow Measurement The existing facility has 12-inch throat parshall flume for flow measurement with maximum capacity of 10.4 MGD. The existing parshall flume would meet the flow measurement needs for Design Option No. 1. 4.2.1.3. Grit Removal The maximum capacity of the existing grit removal process is 7.0 MGD at PHWW flows. Therefore, the current grit removal system has adequate capacity for Design Option No. 1. A bypass is provided for peak instantaneous flows. Addition of a grit cyclone to the grit classifier will also be investigated to alleviate plugging issues that have occurred with the existing classifier. City of Elk River—T12.104758 Page 17 Wastewater Treatment Facility Plan Prepared by Bolton&Menk,Inc. w — W�W� r--- ------- N zo of r iii \ X Oz �Y Yr� Wmm I V tiUU -og �1 i os�° ;1 m m x � z a oN a-inO /i� o N --------g IF I i I Q` I ' I LTT-I — . — -- Z � . I I ----- ------I I I � �s I --——— ———— —— — I I I I � I �I I oz�1 30- d v 4.2.1.4. Primary Clarifiers To meet the PHWW flow requirements for Design Option No. 1 the existing facility would need an additional 2.66 MGD of capacity. This could be accomplished by the addition of two 40-foot diameter clarifiers that could be brought in to service in two phases. One additional 40-foot clarifier would provide enough total capacity for a PHWW flow of 4.52 MGD. Once PHWW flows reached 90% of the capacity of the three clarifiers the fourth clarifier could be brought on line which would increase the total PHWW capacity of the primary clarifiers to 6.03 MGD. With all four primary clarifiers online the system would meet the design requirements for Design Option No. 1. Staging the addition of the third and fourth clarifiers would provide easier operation at current flows. Sizing of the additional clarifiers was based on Ten States Standards which states that the primary clarifiers receiving waste activated sludge would be designed for a surface overflow rate of 1200 gpd/ft2. The new 40-foot diameter clarifiers will be sited just south of the existing primary clarifiers as shown in Figure 4.1. 4.2.1.5. Trickling Filters Improvements to the trickling filters will include modifications to the trickling filter operation and recirculation piping. The modifications would include operation of the two trickling filters in parallel with pumping and piping modifications to achieve a recirculation rate of 100 percent. Other possible modifications include improvements to the distribution arm, controls, ventilation, and access ways. When the trickling filters are run in the above mentioned configuration, each trickling filter would be able to treat 1.43 MGD. The remaining flow will be by-passed to a new activated sludge process. 4.2.1.6. Activated Sludge Process Since the existing trickling filters do not have enough capacity to treat all the flows and loadings, an additional biological wastewater treatment process is required. In order to provide a reliable, easy to operate system, an extended aeration activated sludge process would be constructed. City of Elk River—T12.104758 Page 18 Wastewater Treatment Facility Plan Prepared by Bolton&Menk,Inc. The extended aeration basin will be designed with a solids retention time of 20 days, organic loading of 15 lb/day/1,000 cubic feet of basin volume, a food to mass (F/M) ratio between 0.04-0.10 lbs CBOD5/lbs MLVSS/day, a Mixed Liquor Suspended Solids (MLSS) between 2,000-5,000 mg/l, and 1.1 lbs OZ/lbs of peak hourly CBOD5. A series of concrete aeration basins with a total volume of 1.8 MG would be provided to meet the design loading conditions. The basins would be approximately 80 feet wide by 160 feet long with a side water depth of 18 feet. A selector basin for biological phosphorus removal would also be provided with an approximate volume of 240,000 gallons. During the activated sludge process the biomass grows and reproduces as the organic matter in the wastewater is consumed. To avoid excessively high MLSS and effluent solid losses, periodic solids wasting is required. Wasting of solids would occur from the final clarifiers after settling and would be used to maintain a desired MLSS concentration within the aeration basin. In addition, Return Activated Sludge (RAS) would be returned to the aeration basins from the final clarifiers to maintain a healthy and active biomass within the system. To accommodate the RAS/WAS pumping needs a new RAS/WAS building would be constructed. This building would house new sludge pumps and flow meters so return and waste flows could be accurately controlled and measured. The location of the aeration basins and RAS/WAS building are shown in Figure 4.1. 4.2.1.7. Final Clarifiers The existing Final Clarifiers have maximum PHWW flow capacity of 5.28 MGD which is 0.40 MGD short of design year PHWW flow. It is proposed that the City reevaluate the final clarifiers in the future when the peak hourly flows to the facility reach 90 percent of the capacity of the final clarifiers. Although the capacity of the final clarifiers is adequate for Design Option No. 1, other improvements will be investigated to improve the operation of the existing clarifiers. Those improvements will include the addition of covers to inhibit algae growth and improved flow control and measurement for return and waste flows. City of Elk River—T12.104758 Page 19 Wastewater Treatment Facility Plan Prepared by Bolton&Menk,Inc. 4.2.1.8. Filters The existing gravity filters have a design flow of 7.0 MGD and will have adequate capacity to meet the PHWW flow of 5.68MGD for the design year 2035. To optimize filter operation, modifications of the filter controls, media, and the chlorine feed system will be evaluated. Modifications to the chlorine feed system shall include an inline chlorine analyzer to protect against over chlorination. 4.2.1.9. Disinfection Capacity of the existing UV system at PHWW flow is 3.0 MGD which is 2.67 MGD short in capacity for Design Option No. 1. To meet the design requirements, new UV equipment would need to be installed in the existing spare channel which would increase the total capacity at PHWW flow to 6.0 MGD. Additional improvements would include replacing the effluent weir on the existing UV channel with a fixed depth finger weir. 4.2.1.10. Electrical/Controls The existing control system does not include a central control system for the entire wastewater treatment facility. Upgrades to the control system will include a new control building with a centralized control system that will allow the operators to monitor and control all units of the treatment process from one location. A new control building and garage area is needed since the activated sludge process will require removal of the existing control building and garage space. The new control building will house the upgraded control system and will also include laboratory and garage areas. 4.2.2. Design Option No. 2 Detailed descriptions of the improvements for each unit process for Design Option No. 2 are presented in the following sections. An updated site plan with the needed improvements is present in Figure 4.3. The process flow diagram for Design Option No. 2 is identical to the process flow diagram for Design Option No. 1 which was presented in Figure 4.2. City of Elk River—T12.104758 Page 20 Wastewater Treatment Facility Plan Prepared by Bolton&Menk,Inc. --x X-X x X X X x x y 6 lo ----------- ox l Z = .g rT w 11 I'v PI ZEE- ---------------- c_ - Z, zzl- 4.2.2.1. Screening Ten States Standards states that the capacity of the screens should meet the design peak instantaneous flow with one unit out of service. By these criteria the screening process is 2.08 MGD short in capacity for Design Option 2. Addition of a new screen would require an addition to the pretreatment building with substantial capital costs. Therefore, a manual screen insert would be constructed that could be placed in the existing channel if one of the screens was down for maintenance. The addition of the manual screen will meet the design requirements. 4.2.2.2. Flow Measurement The existing facility has 12-inch throat parshall flume for flow measurement with maximum capacity of 10.4 MGD. The existing parshall flume would meet the flow measurement needs for the Design Option No. 2. 4.2.2.3. Grit Removal The maximum capacity of the existing grit removal process of 7.0 MGD at PHWW flows is slightly less that the design PHWW flow of 7.27 MGD for Design Option No. 2. Due to the age and the capacity of the existing grit removal process, it is recommended that the City reevaluate the grit removal process when peak flows to the facility reach 90 percent of the capacity of the grit system. Addition of a grit cyclone to the grit classifier will also be investigated to alleviate plugging issues that have occurred with the existing classifier. 4.2.2.4. Primary Clarifiers To meet the PHWW flow of 7.27 MGD at the design year the existing facility would need an additional capacity of 4.23 MGD of capacity. Due to land area constraints the maximum clarifier area that can be added is two 40 foot diameter clarifiers as was discussed in Design Option No. 1. Two 40 foot diameter clarifiers would provide an additional 3.02 MGD of capacity at PHWW. However, this capacity could increase if City of Elk River—T12.104758 Page 21 Wastewater Treatment Facility Plan Prepared by Bolton&Menk,Inc. wasting was no longer done to the primary clarifiers. Ten States Standards states that the primary clarifiers not receiving waste activated sludge would be designed for a surface overflow rate of 1,500—2,000 gpd/ft2 instead of 1200 gpd/ft2 for primary clarifiers that receive waste activated sludge. Using this design standard, the total capacity of four, 40 foot diameter clarifiers would be 7.54 MGD which would meet the design conditions for Design Option No. 2. Consequently,modifications to the sludge handling process would be required as waste activated sludge would no longer be sent to the primary clarifiers. The new 40 foot diameter clarifiers will be sited just south of the existing primary clarifiers as shown in Figure 4.3. 4.2.2.5. Trickling Filters Improvements to the trickling filters will include modifications to the trickling filter operation and recirculation piping. The modifications would include operation of the two trickling filters in parallel with pumping and piping modifications to achieve a recirculation rate of 100 percent. Other possible modifications include improvements to the distribution arm, controls, ventilation, and access ways. When the trickling filters are run in the above mentioned configuration, each trickling filter would be able to treat 1.43 MGD of flow. The remaining flow will be by-passed to a new activated sludge process. 4.2.2.6. Activated Sludge Process Since the existing trickling filters do not have enough capacity to treat all the flows and loadings, an additional biological wastewater treatment process is required. In order to provide a reliable, easy to operate system, an extended aeration activated sludge process would be constructed. The extended aeration basin will be designed with a solids retention time of 20 days, organic loading of 15 lb/day/1000 cubic feet of basin volume, a foot to mass (F/M)ratio between 0.04-0.10 lbs CBOD5/lbs MLVSS/D,MLSS between 2,000-5,000 mg/l and 1.1 lbs 02/lbs of peak hourly CBOD5. A series of concrete aeration basins with a total volume of 2.6 MG would be provided to meet the design loading conditions. The basins City of Elk River—T12.104758 Page 22 Wastewater Treatment Facility Plan Prepared by Bolton&Menk,Inc. would be designed to provide biological phosphorus removal and would be approximately 110 feet wide by 180 feet long with a side water depth of 18 feet. During the activated sludge process more biomass is produced as bacteria consume the organic matter in the wastewater. To avoid excessively high MLSS and effluent solid losses, periodic solids wasting is required. Wasting of solids would occur from the final clarifiers and would be used to maintain a desired MLSS concentration within the aeration basin. In addition, RAS would be returned to the aeration basins from the final clarifiers to maintain a healthy and active biomass within the system. To accommodate the RAS/WAS pumping needs a new RAS/WAS building would be constructed. This building would house new sludge pumps and flow meters so return and waste flows could be accurately controlled and measured. The location of the aeration basins and RAS/WAS building are shown in Figure 4.3. 4.2.2.7. Final Clarifiers The existing Final Clarifiers have a maximum PHWW flow capacity of 5.28 MGD. Ten States Standards recommends that the Final Clarifiers receiving activated sludge with chemical phosphorous removal should be designed for a surface overflow rate of 900 gpd/ft2. To meet the PHWW flow of 7.27 MGD at the design year the existing facility would need an additional 55 foot diameter secondary clarifier. Since the existing Final Clarifiers have adequate capacity for future flows over the next several years it is not recommended to construct a new secondary clarifier at this time. The city should reevaluate the needs for an additional secondary clarifier as peak flows reach 90 percent of the capacity of the Final Clarifiers. However, improvements to the existing clarifiers should be considered and include the addition of covers to inhibit algae growth and improved flow control and measurement for return and waste flows. 4.2.2.8. Filters The existing gravity filters have a design flow of 7.0 MGD. The PHWW flow for Design Option No. 2 at the design year 2035 is 7.27 MGD. Therefore, the existing facility is 0.27 MGD short in capacity. To optimize filter operation, modifications for the filter City of Elk River—T12.104758 Page 23 Wastewater Treatment Facility Plan Prepared by Bolton&Menk,Inc. controls,media, and the chlorine feed system will be evaluated. Modifications to the chlorine feed system shall include an inline chlorine analyzer to protect against over chlorination. It is proposed that the City reevaluate the filter capacity in the future,when the peak hourly flows to the facility reach 90 percent of the capacity of the existing filters. 4.2.2.9. Disinfection Capacity of the existing UV system at PHWW flow is 3.0 MGD which is 4.27 MGD short in capacity for Design Option No. 2. An existing channel is available for installation of new UV equipment to double the current capacity. However, this addition will not meet the future demands for Design Option No. 2. In order to meet the future demands new UV units would need to be installed in both channels. The new UV units would need to provide a higher intensity than the existing unit in order to increase the total capacity to meet design requirements. Additional improvements would include replacing the effluent weir on the existing UV channel with a fixed depth finger weir. 4.2.2.10. Electrical/Controls The existing control system does not include a central control system for the entire wastewater treatment facility. Upgrades to the control system will include a new control building with a centralized control system that will allow the operators to monitor and control all units of the treatment process from one location. A new control building and garage area is needed since the activated sludge process will require removal of the existing control building and garage space. The new control building will house the upgraded control system and will also include laboratory and garage areas. 4.3 Biosolids Treatment Process This section discusses four alternatives for biosolids handling which are pumping biosolids to Great River Energy (GRE), expansion of the existing anaerobic treatment system,heat drying, and regionalization. City of Elk River—T12.104758 Page 24 Wastewater Treatment Facility Plan Prepared by Bolton&Menk,Inc. 4.3.1. Pump to Great River Energy (GRE) This option would consist of pumping untreated biosolids to GRE for processing. In return, GRE would require the Elk River WWTF to take clarifier water from GRE for treatment. Clarifier flows from GRE would be approximately 150,000 gpd which is fairly insignificant at the future design flows for the Elk River WWTF. Since GRE would accept untreated biosolids, the Elk River WWTF could abandon the existing biosolids treatment process and utilize the existing infrastructure to support pumping of biosolids to GRE. This would include addition of an aeration system in the existing digester and sludge storage tank so they could be used as aerated storage for biosolids that are to be pumped to GRE. Pumping and piping modifications would also be required to pump biosolids to GRE. Design of this system would be done to accommodate biosolids production for Design Option No. 1 and No. 2. A biosolids process flow diagram for this option is provided in Figure 4.4. 4.3.2. Expansion of Existing Anaerobic Digestion System Based on the existing system capacity, expansion of the existing aerobic treatment system would be required to meet future needs. The maximum capacity of the existing anaerobic digesters is 4,470 lbs of dry sludge/day which presents a capacity deficit of 8,930 lb/day and 12,680 lb/day for design Options No. 1 and No. 2, respectively. To meet the future demands, design of the digesters was done using the maximum loading rate of 80 lbs VSS/l'000ft3/day per Ten States Standards. Based on this design standard Design Option No. 1 would require two 55 foot diameter digesters with a side water depth of 20 feet while Design Option No. 2 would require three digesters with the same dimensions. City of Elk River—T12.104758 Page 25 Wastewater Treatment Facility Plan Prepared by Bolton&Menk,Inc. ! « , y E � (}( § §®� ! §2: � \§§ ; r;B §]! §� d � �( ([): \j {� : ; �! d ®kj :f|; \ G) ;! _ \^ \ g !, ) ! d � )( e; d « | ��\ In addition to the digester volume required, additional sludge storage space is needed to meet the design conditions. In order to provide 180 days of storage for biosolids at 4 percent solids, the Elk River WWTF would need an additional 2.8 MG of sludge storage for Design Option No. 1 and 3.8 MG for Design Option No. 2. Do to the excessive land requirements for the required digesters and sludge storage, expansion of the anaerobic digestion system is not viewed as a feasible option and will not be analyzed any further in this report. 4.3.3. Heat Drying The heat drying process for biosolids treatment consists of aerated biosolids storage, dewatering, and heat drying. To implement this process at the Elk River WWTF, aeration equipment would be added to the existing biosolids storage tanks to provide aerated storage. A biosolids processing building would be constructed to house the dewatering and drying equipment as well as storage for the dried biosolids. The end product would be roughly 90 percent solids and would be stored until land application. Design of the heat drying system would include provisions to meet both design conditions. The location of the proposed biosolids building is shown in Figures 4.1 and 4.3 while a biosolids process flow diagram for this option is provided in Figure 4.5. 4.3.4. Regionalization Regionalization for biosolids treatment could be done with the City of Buffalo for contract biosolids treatment. In this partnership the City of Elk River would be responsible for hauling biosolids to the Buffalo WWTF which could be contracted out to a licensed biosolids hauler. The City of Elk River would also have to pay a set fee for treatment of biosolids based on total dry tons of sludge treated. City of Elk River—T12.104758 Page 26 Wastewater Treatment Facility Plan Prepared by Bolton&Menk,Inc. 49 : « § r! r�5 e : ( � \ � - (, )) : [!! za • > ; « d ®k/ G! !) (\ \\ ! � y ( ( - §/e 2 /§ o IT E, \ SECTION 5.0 COST ESTIMATE 5.1 GENERAL In order to prepare the preliminary construction cost estimates presented herein, various material and equipment manufacturers and suppliers were contacted. Published and unpublished data on costs for similar kinds of construction were also utilized. The estimated costs are for January 2013. Increases in construction costs due to inflation are not taken into account. The cost estimates presented here are intended for use as a guideline in the decision process. Once preparation of final drawings and specifications is underway, more refined cost estimates will become available. 5.2 LIQUID STREAM IMPROVEMENTS The preliminary cost estimates for the liquid stream improvements for Options No. 1 and No. 2 are presented in Table 5.1. As shown, the line items that have a cost difference for the two options are the aerations basins, blowers, fine pore diffusers, UV system, and the electrical/control system. These cost differences are attributed to the larger aeration basin size and new UV system required for Design Option No. 2 design flows. City of Elk River—T12.104758 Page 27 Wastewater Treatment Facility Plan Prepared by Bolton&Menk,Inc. Table 5.1 Preliminary Cost Estimates for Liquid Stream Improvements Elk River Wastewater Treatment Facility Item Cost Design Option Design Option No. 1 No.2 Mobilization $300,000 $300,000 Site Work $600,000 $600,000 Site Pi in /Valves $200,000 $200,000 Grit Cyclone $15,000 $15,000 Clarifier Equipment for Existing and New(4) $500,000 $500,000 New Clarifier Structure(2) $200,000 $200,000 Trickling Filter Improvements $250,000 $250,000 Activated Sludge Basins $1,350,000 $1,950,000 Fine Pore Diffusers $140,000 $200,000 Blowers $250,000 $300,000 Secondary Clarifier Covers(3) $300,000 $300,000 RAS/WAS Building and Pumps $200,000 $200,000 Filter Chlorination System $30,000 $30,000 UV Upgrades $200,000 $400,000 Blower/Sludge Pumping Building $200,000 $200,000 Electrical/Controls $1,500,000 $1,700,000 New Control Building/Garage $1,200,000 $1,200,000 Total Construction Cost $7,435,000 $8,495,000 Contingency(10%) $744,000 $850,000 En ineerin /Admire(15%) $1,115,000 $1,274,000 Total Project Cost $9,294,000 $10,619,000 City of Elk River—T12.104758 Page 28 Wastewater Treatment Facility Plan Prepared by Bolton&Menk,Inc. 5.3 BIOSOLIDS HANDLING IMPROVEMENTS The cost estimate for each biosolids handling alternative is presented in the following sections. 5.3.1. Pump to Great River Energy (GRE) Table 5.2 presents the cost estimate for the Great River Energy Biosolids Option. As shown, the costs for this option include site piping, pumps, sludge storage upgrades, and electrical/controls. Table 5.2 Preliminary Cost Estimates for Great River Energy Biosolids Option Elk River Wastewater Treatment Facili Item Cost Site Work/Site Piping $150,000 Pumps $125,000 Sludge Storage Aeration Equipment $175,000 Electrical/Controls $90,000 Total Construction Cost $540,000 Contingency(10%) $54,000 En ineerin /Admire(15%) $81,000 Total Project Cost $675,000 5.3.2. Heat Drying Table 5.3 presents the cost estimate for the Heat Drying Biosolids Option. As shown, the costs for this option include site piping, a new biosolids building, process equipment for dewatering and heat drying, mechanical equipment, and electrical/controls. City of Elk River—T12.104758 Page 29 Wastewater Treatment Facility Plan Prepared by Bolton&Menk,Inc. Table 5.3 Preliminary Cost Estimates for Heat Drying Biosolids Option Elk River Wastewater Treatment Facilit Item Cost Mobilization $300,000 Site Work $200,000 Site Piping $100,000 Building(12,000 sq ft) $1,560,000 Polymer Feed System $50,000 Pumps/Piping $150,000 Dewatering Equipment $600,000 Sludge Storage Aeration Equipment $150,000 Heat Drying Equipment $4,000,000 Conveying Systems $50,000 Odor Control System $150,000 Mechanical $750,000 Electrical/Controls $800,000 Total Construction Cost $8,860,000 Contingency(10%) $886,000 En ineerin /Admire(15%) $1,329,000 Total Project Cost $11,075,000 5.3.3. Regionalization Table 5.4 presents the cost estimate for the Regionalization Biosolids Option. Costs were calculated for present conditions as well as both design conditions. Costs were also calculated for hauling cake biosolids versus liquid biosolids. Table 5.4 Preliminary Cost Estimates for Regionalization Biosolids Option Elk River Wastewater Treatment Facility Present Option 1 Option 2 Liquid Cake* Liquid Cake* Liquid Cake* Yearly Treatment Cost $558,000 $496,000 $2,202,000 $1,957,000 $2,818,000 $2,505,000 Yearly Hauling Cost $198,000 $37,000 $782,000 $147,000 $1,001,000 $188,000 Total Yearly Cost $756,000 1 $533,000 $2,984,000 $2,104,000 $3,819,000 $2,693,000 *Cake biosolids hauling would require the construction of a biosolids dewatering facility. City of Elk River—T12.104758 Page 30 Wastewater Treatment Facility Plan Prepared by Bolton&Menk,Inc. SECTION 6.0 RECOMMENDATIONS AND IMPLEMENTATION 6.1 Recommended Wastewater Treatment Improvements The recommended wastewater treatment improvements consist of improvements outlined under Design Option No. 2 and the Great River Energy Biosolids Option. One exception to this is the improvements to the UV system. UV system upgrades will match what was outlined for Design Option No. 1. When future flows reach the design requirements for Option No. 2 the UV system will be towards the end of its useful life and further upgrades to the UV equipment will be done at that time. The Great River Energy Option for biosolids treatment was selected due to its dramatic cost savings over the other biosolids treatment options. These improvements will include the following items: 1. Addition of a grit cyclone to the grit classifier. 2. Construction of two new primary clarifiers and replacement of the existing clarifier equipment. 3. Improvements to the existing trickling filters including recycle pumping and controls. 4. Construction of a 1.8 MG aeration basin which will require construction on the land to the south of the existing wastewater treatment facility. 5. Construction of two new buildings, one to house the RAS/WAS pumps and one to house the aeration blowers and biosolids storage transfer pumps. 6. Construction of a new control building which will include upgraded electrical controls, lab space and garage space. 7. Installation of covers on the final clarifiers. 8. Improvements to the chlorine feed system for the sand filters. 9. Installation of another UV unit in the existing spare channel. 10. Installation of a sludge transfer line and necessary pumps to send biosolids to Great River Energy. 11. Improvements to the overall controls system for the entire facility. The total project cost for the recommended improvements is presented in Table 6.1. City of Elk River—T12.104758 Page 31 Wastewater Treatment Facility Plan Prepared by Bolton&Menk,Inc. Table 6.1 Preliminary Cost Estimate for Recommended Improvements Elk River Wastewater Treatment Facility Item Cost Liquid Stream Improvements $8,095,000 Biosolids Handling Improvements $540,000 Total Construction Cost $8,635,000 Contingency(10%) $864,000 En ineerin /Admire(15%) $1,295,000 Total Project Cost $10,974,000 Annualized Payment(20 years @ 4%) $794,200 6.2 Project Funding There are several alternatives that the City can consider for project funding and each is discussed below. 6.2.1. Bonding The City could sell general obligation, local improvement, or revenue bonds in order to raise funds for the capital costs to improve the treatment facility. The proceeds of the bonds would need to be repaid, either through property taxes, assessments, or user charges. 6.2.2. Assessment A portion of the capital costs of the project can be assessed to local property owners under Minnesota Statute 429. Using this method, a one-time assessment could be levied and repaid over a period of 10 to 20 years. This cost could help offset monthly increases in user fees and permit use of general obligation bonding. 6.2.3. State Revolving Fund Loan (PFA) The loan program was created under the State Revolving Fund (SRF) provisions in the Federal Clean Water Act to provide financial assistance for water pollution control projects. Minnesota's revolving loan program provides loans to municipalities for planning, design, and construction of wastewater treatment City of Elk River—T12.104758 Page 32 Wastewater Treatment Facility Plan Prepared by Bolton&Menk,Inc. projects. The loans are typically for a 20-year period at an interest rate of two to four percent. The loan monies are administered through the PFA. To be eligible for PFA funding, the City must submit this Facility Plan for review and approval by the MPCA. Revenue for loan repayment is typically generated by user rates, availability charges, or assessments. 6.2.4. Other Funding Mechanisms Through the PFA and Clean Water Legacy funding, TMDL and Phosphorous grants have been available. If eligible, the applicant can receive a grant for 50 percent of the improvements attributed to meeting the TMDL or Phosphorous requirements with a cap of$3 million. These grants are applied for in July of each year and the City should apply for these grants to see if they are eligible. 6.3 Allocation and Impact on User Fees Since the new wastewater treatment facility is planned for a 20-year period, both existing and future users need to pay for the wastewater treatment facilities. The existing users will pay for the portion of the wastewater treatment improvements through user rates. The new users will pay a one-time capitol charge when connecting into the wastewater treatment facilities as well as the same user rates as the existing users. The user fees and Sewer Access Charges (SAC) will provide the financial resources to fund the wastewater treatment facility improvements. The trunk sanitary sewer fees may have to be adjusted to pay for future collection system improvements. A summary of the impacts that the wastewater treatment improvements would have on the existing residential users and future residential users is presented in Table 6.2. As shown, the impact on user rates is dependent on the percent allocation of SAC revenue to the wastewater treatment facility improvement costs. City of Elk River T12.104758 Page 33 Wastewater Treatment Facility Plan Prepared by Bolton&Menk,Inc. Table 6.2 Wastewater User Rates City of Elk River, MN Percent Allocation of SAC Revenue to WWTF 100% 75% 50% 25% Loan Cost 20 Years 4% $794,200 $794,200 $794,200 $794,200 SAC Yearly Revenue Allocated to WWTF $956,300 $717,200 $478,100 $239,100 Revenue Needed from User Fees -$162,000 $77,000 $316,100 $555,200 Cost Increase per 1,000 Gallons NA $0.18 $0.72 $1.27 Monthly Increase for 5,000 Gallon User NA $0.88 $3.61 $6.34 6.4 Implementation Schedule The proposed implementation schedule for the wastewater treatment facility improvements is presented in Table 6.3. The presented schedule is the most aggressive schedule possible and the City can add time to this schedule as needed for planning and securing financing for the project. Table 6.3 Implementation Schedule City of Elk River, MN Item Completion Date Submit Facility Plan to MPCA for review and approval March 2013 City requests placement on MPCA Project Priority List March 2013 MPCA reviews and approves Facility Plan. Aril—July 2013 City requests placement on the MPCA 2013 Intended Use Plan May 2013 Prepare plans and specifications for the wastewater treatment facility August—November 2013 improvements 2013 Intended Use Plan is approved by MPCA. September 2013 Submit plans andspecifications to MPCA for review and approval. December 2013 —February 2014 City advertises, open bids, and accepts construction bids for facility March—April 2014 improvements. Initiate construction of wastewater treatment facility improvements. May 2014 Complete construction of wastewater treatment facility May 2016 improvements and meet discharge standards. City of Elk River—T12.104758 Page 34 Wastewater Treatment Facility Plan Prepared by Bolton&Menk,Inc. Appendix A Projected Flow Calculations C D CL w � n Ln oo N � O n 00 CL T m N � u O m Q Ln V) Ln Q 0 L \ � N 7 O — 'O -O O N u O W m Q Q u Q Q u Q Q m L Q t]O t]O t]O m UO uo V1 m UO uo LA rI N N 0 �t Kt �o rI r-I O O O N O O 00 00 O �D �o �o N O r-I 0) I, O 00 O r4 N -1 u. Ln oO ` O N E M Ln Ln in 1.0 k.0 O 01 01 i n O N N m m N a E CL O a o _0 r � � f.7 •+� L ) C 7 a Q � Ln oa L L ° u o m o a m o 3 � E 3 ° E 3 3 a c a m Q m m O � Q o m a u O o m E °—' Q a — E m " E m 3 3 m m t m 3 0 0 .L 0 Ln 0 d' a s a s 3 m m = Q Q j CL �I 0 � �CC O HO C ~ N N ri M A `n CL N T ri u O m w m t u a L Ln u u u rn Ln 0 Q c m m m m O o o E � o E _0 -o E _0 -o _ u o m m a a u a s u a s u a s t a m t a UO do do m do do m do do m do do +� N N N O I, n O O M O �D u1 O Ln 3 00 O �D �o rj M O O n M O m u1 O N ,J-) nN r-I N U1 u1 M M 0 O m �p N u1 E ri u1 M +� ^� O n M N `� M N r-I m L Ln Ln N N Q M M m ^ E Q V Q c� O m M c �' > HU E a 3 E m a, o L O U _ Ln w L.L a 0) 0) E W W c"o Q c j°, u °J c v 3 a Q m o 3 � .o 3 0 °- 3 ° 3 3 G� G O a ° m m —O _0 a u —° m a u —° m a u o O '^� a m E m Q a 'A E � " 3 Ln E � " o E m m � 3 m- 3 m m � m �u Ln O O u _ O u _ O u _ O O Wa s LL d LL J a a LL = Q Q LL = a a LL Elk River WWTF Facility Plan Projected Flow Calculations Proiected Flow Option No.1 Proiected Flow Option No.2 ADW Flow ADW Flow Existing Flow 1.19 MGD Existing Flow 1.19 MGD Flows From Undeveloped Land 1.25 MGD Flows From Undeveloped Land 2.12 MGD Flow from Existing Sources not Flow from Existing Sources not Currently Connected to Sewer 0.67 MGD Currently Connected to Sewer 0.67 MGD Total ADW Flow 3.11 MGD Total ADW Flow 3.98 MGD AWW Flow AWW Flow AWW/ADW(From Historical Data) 1.14 AWW/ADW(From Historical Data) 1.14 AWW Flow 3.55 MGD AWW Flow 4.54 MGD PHWW Flow PHWW Flow Pealing Factor,M 1.60 Pealing Factor,M 1.60 PHWW Flow= M*AWW PHWW Flow= M*AWW PHWW Flow 5.68 MGD PHWW Flow 7.27 MGD PIWW Flow PIWW Flow Peaking Factor,M1 2.00 Peaking Factor,M1 2.00 PIWW Flow= Ml*AWW PIWW Flow= Ml*AWW PIWW Flow 7.10 MGD PIWW Flow 9.08 MGD ADW 3.11 MGD ADW 3.98 MGD AWW 3.55 MGD AWW 4.54 MGD PHWW 5.68 MGD PHWW 7.27 MGD PIWW 7.10 MGD PIWW 9.08 MGD Appendix B National Pollutant Discharge Elimination System (NPDES) Permit MN 0020788 DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT STATE OF MINNESOTA Minnesota ir I Municipal Division National Pollutant Discharge EIimination System(NPDES)/ State Disposal System(SDS)Permit MN0020788 PERMITTEE: City of Elk River FACILITY NAME: Elk River WWTP RECEIVING WATER: Mississippi River(Class IC,213d,313,3C,4A,413, 5,6 water)[ORVW) CITY OR TOWNSHIP: Elk River COUNTY: Sherburne ISSUANCE DATE: December X,2007 EXPIRATION DATE: November 30,2012 The state of Minnesota,on behalf of its citizens through the Minnesota Pollution Control Agency (MPCA),authorizes the,Permittee to construct,install and operate a disposal system at the facility named above and to discharge from this facility to the receiving water named above,in accordance with the requirements of this permit. The goal of this permit is to protect water quality in accordance with Minnesota and US statutes and rules,including Minn.Stat. chs. 115 and 116,Minn.R. chs. 7001,7041,7050,and the US Clean Water Act. This permit is effective on the issuance date identified above,and supersedes the previous permit that was issued for this facility on July 31,2002. This permit expires at midnight on the expiration date identified above. Signature: Ronald R. Swenson,Supervisor for The Minnesota Pollution Control Agency I Municipal Wastewater Section Municipal Division Submit DMRs to; Questions on this permit? Attention:Discharge Monitoring Reports • For DMR and other permit reporting issues,contact: Minnesota Pollution Control Agency Jennifer Satnik,651-296-8710. 520 Lafayette Road North St,Paul,MN 55155-4194 • For specific permit requirements or permit compliance status,contact: Submit Other WQ Reports to: Herschel Blasing,218-828-6064. Attention:WQ Submittals Center Minnesota Pollution Control Agency • General permit or NPDES program questions,contact: 520 Lafayette Road North MPCA Customer Assistance Center, St.Paul,MN 55155-4194 651-297-2274 or 800-646-6247. 520 Lafayette Rd.N.;St.Paul,MN 55155-4194;651-296-6300(voice);651-282-5332(TTY) Regional Offices: Duluth Brainerd + Detroit Lakes • Marshall Rochester Equal 022ortuni EmElMr - Printed on recycled a er comainin.,at least 10%fibers from 2ager rec sled by consumers DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT Page 2 Permit MN0020788 Table of Contents Permitted Facility Description 3-4 Topographic Map of Permitted Facility 5 Summary of Stations and Station Locations 6 Limits and Monitoring Requirements _ 7-15 Chapter 1. Compliance Schedule 16 1. Compliance Related Construction Schedule Chapter 2. Biosolids Land Application 16-20 L Authorization 2. Compliance Responsibility 3. Notification Requirements 4. Pollutant Limits 5. Pathogen and Vector Attraction Reduction 6. Management Practices 7. Monitoring Requirements 8. Records 9. Reporting Requirements Chapter 3. Domestic Wastewater--Mechanical System 20 L Bypass Structures 2. Sanitary Sewer Extension Permit 3. Operator Certification Chapter 4. Non-waste.Streams- Mercury Management Plan 20-21 1. Mercury Pollutant Minimization Plan Chapter 5. Phosphorus Management Plan 22 1. General Requirements Chapter 6. Surface Discharge Stations 22-23 1. Requirements for Specific Stations 2. Sampling Location 3. Surface Discharges 4. Discharge Monitoring Reports Chapter 7. Waste Stream Stations 23 1. Requirements for Specific Stations 2. Special Requirements 3. Sampling Location Chapter 8. Total Facility Requirements 23-30 L General Requirements DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT Page 3 Permit MN0020788 Facility Description The Elk River WWTP facility(Facility)is located at NE 1/4 of Section 3;Township 32 North,Range 26 West,Elk River, Sherburne County,Minnesota. This is a Class B facility. Major components of the ,Facility include: Collection with gravity and/or Pressure Sewer. 2 Bar Screen-mechanical Influent Flow Meter 1 Grit Removal 2 Primary Clarifier 2 Trickling Filter - I Activated Sludge-contact stabilization,conventional,step feed Phosphorus Removal-chemical 3 Secondary Clarifier Filter-sand with backwash(Proposed) Ultraviolet Light 2 Anaerobic Digester-complete mixed,heated-mesophilic 2 Storage Tank Land Application The existing Class B wastewater treatment facility consists of two mechanically cleaned bar screens, screenings wash press,influent Parshall flume,vortex-type grit removal system,two primary clarifiers, two trickling filters(currently run in series mode),aeration basin(no diffusers or blowers were provided/installed),three secondary clarifiers,ultraviolet(UV)disinfection and a chemical feed system. Biosolids treatment consists of anaerobic sludge digestion using one primary and one secondary anaerobic sludge digester. Biosolids are stored in two sludge storage tanks and eventually land applied. There are no known bypass points in the disposal system. The Facility has a continuous discharge(SD-001)to the Mississippi River(Class IB,2Bd,3B,3C,3C, 4A,4B, 5,6 water)and is designed to treat an average wet weather flow of 2.2 million gallons per day (mgd)and an average dry weather flow of 1.97 mgd. The Facility has a five day carbonaceous biochemical oxygen demand(CBOD5)strength of 200 milligrams per liter(mg11)based on the average wet weather design flow. The Facility was constructed in 1977 and upgraded in 1995_ In accordance with MPCA rules regarding nonde.gradation for outstanding resource value water (ORVW),the design average wet weather flaw of the Facility as of November 5, 1984,and associated mass loading are the baseline design flow and mass loading. This baseline flow and mass loading will be used to determine whether nondegradation review is required for any change in the discharge. Any change that results in an increased mass loading of one or more pollutants is subject to nondegradation review in accordance with Minn.R.7050.0180. The reach of the Mississippi River where the discharge from the Facility is located(between St. Cloud to Anoka)was classified as an ORVW on November 5, 1984. The design average wet weather flow of this Facility on the date of ORVW designation was 1.04 mgd. The Facility was upgraded in 1995. In order to comply with Minn.R. 7050,0180,the mass effluent limits in the NPDES/SDS permit for CBODS and total suspended solids(TSS)were frozen at the level of mass limits in existence on the date of ORVW. DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT Page 4 Permit NIN0020788 designation. To restrict or"freeze"the mass of pollutants entering the ORV W reach,the Facility cannot increase the mass of pollutants in the effluent over that allowed by the permit on November 5, 1984. The?ermittee is proposing to move ahead with the next phase of improvements at their wastewater treatment facility(WWTF). The proposed project will focus on controlling the WWTF's mercury discharge to the receiving water by incorporating a tertiary filtration system. Additionally,the existing UV disinfection system needs to be modified to meet existing design flow demands. The existing trickling filter towers need to have some repair work done on them to stop some leaks as well as some miscellaneous work due to the harsh atmosphere. Additional ancillary work would consist of an expansion of the existing garage and the addition of a standby generator. This proposed project will not increase the current permitted design flow and loading capacity of the WWTF. The location of designated monitoring stations is specified on the attached"Summary of Stations and Station Locations"report. The location of the Facility is shown on the attached topographical map. i DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT Page S Permit KNO020188 Topogralihic Map of Permitted Facility NNO020788,Elk River WNTEF T32N,R26W,Section 3 Elk River.Sherburne County,Minnesota `&'*rs� � i,'p.,'.'''S.',e,°� t i „y f i i '{ .�."'`• "� r 'S.�� Yr ) �a a - t { y 'four III's ri is ! � � at 7 1 j JO: e ar c > F' � ! i 4 - r � .✓^"t^.rte�� '�""" ��„' �' � �� ' t j t � `n*�, � � " SI}0C11 TotalFa6"ts It '01 14 }6 W 4� x 14 '1 d rr t w t ` sn0 . fib t$ -- � 111 Map producted by:MPCA Staff_WOW07 1 17-1 3 Source:USGS Elk River Quad 0 0-1 0.2 0.4 Miles Scale_1:24-000 5 i Permit Issued: Elk River WWTP Page 6 PPnmit Expires: Summary of Stations Permit 4:MN0020788 DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT Land Application Stations Station Tie of Station Local Name PLS Location LA301 Application Site,Biosolids City of Elk River-Site Section 6 NE Quarter of Section 13,Township 32 North,Range 26 West LA302 Application Site,Biosolids City of Elk River-Site Section i NE Quarter of Section 12,Township 32 North,Range 26 West LA30 Application Site,Biosolids City of Elk River-Site Section 3 NE Quarter of Section 12,Township 32 worth,Range 26 West LA304 Application Site,Biosolids City of Elk River-Site Section 5 NE Quarter of Section 1.2,Township 32 North,Range 26 West LA305 Application Site,Biosolids City of Elk River-Site Section 4 NE Quarter of Section 12,Township 32 North,Range 26 West LA306 Application Site,Biosolids City of Elk River-Site Section 2 NE Quarter of Section 12,Township 32 North,Range 26 West Waste Stream Stations Station Type of Station Local Name PLS Location WS302 Biosolids to Land Biosolids Production Site#1 Treatment/Application Surface Discharge Stations - Station Type of Station Local Name PLS Location SD001 Effluent To Surface Water Total Facility Discharge NW Quarter of Section 37 Township 32 North,Range 26 West Waste Stream Stations Station Type of Station Local Name PLS Location WS001 Influent Waste Influent waste stream i Permit Issued: Elk River W WTP Page 7 Permit Expires: Limits and Monitoring Requirements Permit#:MN0020788 DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT The Permittee shall comply with the limits and monitoring requirements as specified below. Period. Limits Applicahle in the Interim Period LA 302 Parameter Limit J Units L �L turn Type�! Effective Period Sample Type Frequency Notes Arsenic Total,Dry Weight 37.00 Iacr Cumulative Total Sep-Aug Calculation 1 x Year Cadmium,Total,Dry Weight,{as Cd} �35.00� lblacr Cumulative Total Sep-Aug (Ii Calculation 1 x Year C� Total,D Weight;(as Cu) 1339.00.i lb/acr {I Cumulative Total—� -Aug '-11 Calculation 1 x Year PP r} b —�� 1 � �_ l ead,Total,Dry Weight(as Pb} 268 lblacr Jf Cumulative Total �� Sep-Aug Calculation 1 x Year ercur};Total,Dry Weight,{as Hg} !IS.00( Ib/acr f�—Cumulative TotaI�i Sep-Aug Calculation I x Year Tolybdenutn,Total,Dry Weight{as i ii4onitor Ibtacr Cumulative Total j Sep-Aug Calculation 1 x Year tckel,Total,Dry Weight,(as Ni) 37>00 b/acr Cumulative Total Sep-Aug Calculation 1 x Year Selenitun,Total,Dry Weight(as Se) ( 89.00 Ib/acr ! Cumulative Total Sep-Aug Calculation 7 x Year - ---- ------- inc,Total,Dry Weight,{as Zn} 25Q0,00 lb/acr Cumulative Total Sep-Aug Calculation F 1 x Year LA 303 Parameter Limit I Units Limit Type Effectave_Periad�Sam le py e�Fregueney Notes j senic,Total,Dry Weight 37.00 lb/acr Cumulative Total l Sep-Auo [Calcula�tion I I x Year [ __ �— admium,Total;Dry Weight,(as Cd} i 35 d0 ( Ibiacr ( Cumulative To fad Sep-Aug Calculation x Year _ II i� —--�� -------- — ---,!— _ _J opper,Total,Dry Weight,(as Cu) 339.00 IUlacr Cumulative Total Sep-Aug Calculation I, 1 x Year I ead,Total,Dry Weight(as Ph) j 268.00 ! Ib/acr Cumulative Total Sep-Aug Calculation i 1 x Year _L Mercury,Total Dry Weight,(as Kg} 15 00 11 Ib/acr Cumulative Total � Sep-Aug i Calculation I x Year ��- � l_-..._.- _.. ._. _?Molybdenum,Total,Dry Weight(as Monitor lb/acr Cumulative Total Sep-Aug Calculation 1 1 x Year ickel,Total,Dry Weight,{as Ni} 375 00 only— lb/ ,cumulative Total 7I Sep-Aug ! Calculation h 1 x Year Selenium,Total Dry Weight(as'Se} 89 00 Iblacr i Cumulative Total Sep-Aug Calculari0 j 1 x Year .._ ........... ine,Total,Dry Weight,(as Zn) 2525 0 Ib� 1 �-Cumulative Total Sep-Aug ( Calctit ilatian 1 x Year t - ___. _ _ __._ - ____,C_ .. -__-._ ... ..__-__ _.__.�L LA 304 r Parameter 1 Li mit Units 'i Limit Ty- e Effective Period iSam le Tv e'iFre q uenc Y, Notes --- — — _h P �l ------- -- — - ! -- Arsenic Total;Dry Weight 37:116 11�lacr Cumulative Total Sep Aug Caiculatton 1 x ear r 1 - — _.....--� _ ..— { Cadmtmn,Total Dry�Vatg}it (as Cd) i 35.00 3 lb'acr Cumulativefiotai Sep Aug Caiculatton 1 x Year Copper.Total,Dry Weight (as Cu) 139 00 li lb acr Cumulative Total Sep ?ug Calculahon 1 x Yeat JL- Lead,Total Dry Weight(as Pb) '—268 00 IC Ib'aer cumulative Total i' Sep-Aug C�aleulatioil ' 1 x Year Pemrit Issued: Elk Dever WWTP Page 8 Pennit Expires: Limits and Monitoring Requirements Permit#:MN0020788 DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT The Permittee shall comply with the limits and monitoring requirements as specified below. Period: Limits Applicable in thebLterim Period LA 304 Parameter Limit�; Units i� Limit Type Effective Period Sample Type�jFrequency No#es Mercury,Total,Dry Weight,(as Hg) 15.00 Ib/acr Cumulative Total 1 Sep-Aug Calculation I( 1 x Year __-_____ - -_- -1--w-- Molybdenum,Total,Dry Weight(as �Iomtor lb/acr Cumulative Total I� Sep-.Aug Calculation I' 1 x Year °�- --- only —lam �L �� ickel,Total,Dry Weight,(as Ni)b 375.00 I lb/acr Cumulative`Total i� Sep-Aug Calculation b _ �' �u Selenium,Total,Dry Weight(as Se} 89.00 ; Ib/acr Cumulative Total Sep-Aug Calculation I x Year �- b _ _ 1�b1 b inc,Total,Dry Weigh Zn) 2500.00 Ib/acr I 'Cumulative Total 11 Sep-Aug Calculation I 1 x Year —b LA 305 { Parameter — Limitb nits Limit Type _ Effective Period Sample Ty a jFreque Notes -- -—� senic,Total,Dry Weight 37.00 lb/ �H Cumulative Total b Sep-Aug Calculation 3b Year I i ...�.---_.... ��---_ Cadmium,Total,Dry Weight,(as Cd i 3e.00 lb/acr �i Cumulative Total .I� Sep-Aug Calculati°n 1 x Year -_-- _ _ _ I-_ (Copper,Total,Dry Weight,i(as Cu) it 1339-0b Ib/acr i Cumulative Totat Sep-Aug Calculation ( l x Year - ead,Total,Dry Weight(as Pb) 268.00 Ib�/ate Cumulative Total Sep-Aug l x Year ' — �' Calculation -1 ;Mercury,Total,Dry Weight,(as Hg) 15,00 Ib(acr I) Cumulative Total I� Sep-Aug ^Calculation I x Year I olybdenum,Total,Dry Weight(as F Monitor lb/acr I Cumulative Total —Seep—Aug Calculation 1I 1 x Year ickel,Total,Dry Weight,.(as Ni) 375.00 lb/ac Dative Total Sep Aug CaicuIatiob 11 7 x Year Selenium,Total,Dry Weight(as Se) 89,00 lblacr ( Cumulative Total ( Sep-Aug Calcr elation i T x Year I _ `_� _ _ zinc;Total,Dry Weight,{as Zn} 500.00 ( 1b/acr'. Cumulative Total Sep,Aug 1 Calculation 1 x Year -- LA 306 Parameter l Limit Umts 1 Limit Type LEffective Period [Sample Ty�;Frequency totes,l —=- Aisenic,Total,Dry Weight 37 00 Ibl�acr Cumulative Total Sep Aug Calculation l x Yaar, 11 I j I _. . l admiuxn,Total,Dry Weight,{as Cd} 'r 35.00 Ib/acr l Cumulative Total Sep-Aug Calculation j I x Year Copper,Total Dry Weight,(as Cu) 1339.00] lblacr Cumulative Total jl Sep-Aug 1 Calculation I x Year } Lead Total,Dry Weight(as Pb) 268.00 lblacr Cumulative Total Sep Aug j, Calculation l x Year �Mareury,Total,Dry Weight,(as Hg) �. 15.00 �lbiacr y Sep-Aug Cumulative 7ota1 Calculation �, ] x Yeax L_ --iI __-- _ Molybdemin Total,Dry Weight(as i Monitor I lb/acr Cumulative Total Sep-Aug l�lculahon 1 x Year - I I J Mb Only .. _.... '- -- .._.._...----......:._:. _. Nickel,Total,Dry Weight (as Nr) 3,5.00 ( Ib/acr Cumulative Total Sep-thug Calculation I 1 x Year ---- �- �i . .......... -- -.. Selenium,Total,Dr Weight as Sc 89.00 lh'acr Cmnulahve Total Sep-Aug Calculation 1 x Year r I k( i ........................................-._.___ Permit Issued: Elh-River WW Page 9 Permit Expires: Limits and Monitoring Requirements Permit 4:IVIN0020788 DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT The Permittee shall comply with the limits and monitoring requirements as specified below. Period. Limits Applicable in the Interim Period LA 306 F Parameter 7QL Lindt Type :e:q u=en c y Notes Effective Period [Fr —e i; lb/ Cumulative Total x car me,Total,D as n SD 001 F— Parameter I Limit Units ...... Limit Type Effective Period Sample Ty p Frequency [-Notes Month Average Week VO ,�C.,b..�.-ous 05 Day(20 De 98 117 k day Calendar Mon _bm X W��] P:!!! 2� 24-Hour Flow[72 x Week _1 Compositq OD,Carbonaceous 05 Day(20 Deg mg/L Jan-Dec -w -Hour Flow OD,Carbonaceous 05 Day(20 Deg 157 !1! kg/day [!M�aaximuna_c'�Jendar Week Jan-Dec 2 x Week Co. te A OD,Carbonaceous 05 Day(20 Deg 1 40 1! mg/L Maximum Calendar Week- Jan-Dec ][24-Hour Flow, 2 xWeek t Composit POD,Carbonaceous 05 Day{20 Deg _85 M' m Calendar Month Jan-Dec I Calculation 2 x Week immut Percent Removal Average Calendar Month Geometric Jan-Dec Grab 2 x Week �ecal Coliform,TAPN or Membrane Filter 44.5C Mean j Jan- T 11 7_ Daily Maximum' Grab x onth 3 _�7 =ng/L ; Dec i Total(as Hg) ---------- I ing Calendar Month Minimum Jan-De Grab 11--i lqoniw I 67a 'Oxygen,Dissolved H Only H :F—--Grab 1PI x a 9.0 Calendar Month Maximum _J Grab I x Day .�H Calendar Month Minimum J.-Dec- Phosphorus,Total(as P) IF i Moni torl,j' mg/L Calendar i Month Average 24-Hour Flow� I x Week 1 On] _ ,Solids,Total Suspended 2 x W ee- (TSS ii 118 kg/day Calendar Month Average i Jan-Dec F24-Hour Flo, oinposite S Calendar Month Average Solids,Total Suspended 30 mg 24-Hour Flow 2 x Week cluge] wyj Maximum Calendar Week Jan-Dec 2� Solids;Total Suspended(TSS) 177 !1 I-Hour Flow 2 x Week 11 -om ne� Average Lc go-m J_ ______J_ F�7 Calendar Week X24-Hour Week 1 ids,Total Suspended(TSS) mg/L I Maximum Cale Tr x week Average -Ca eian 2 % Jan-Dec I lc�l -I x Week 'Solids,Total Suspended(TSS)Percm-til-M5 Minimum Calendar Month i I Average WS 001 ----------- Limit Units 11 S�rm fie u e!� Notes Parameter -Limit Type IFEffeeti�e Period :S _p)(e_ L _q yj x- Flo I wul� n ari o_n� 4-if Tug, i ae -a' t farn-Dec 11361a,Carbonaceous 05 Day(2 Deg Avei:�ie�I C) —------ Cmp _9§ite F BOD,Carbonaceous 05 -Day(20 Deg*'* ____our FGv+1 Jan-Debi it 2 x Week `,Tiig/L Calendar i 1C) Only y- [M�onjtor IF - Dec 1 Measureni� ;Flow mgc .1 Calendar Month Average: an - ------ .............. ..................................... iii, m snit af, tt' Ian 1&, ti MinalimiTwilt I 1 K Dwi, IL Continuous Flow il Monitor !I TAG Calendar Month Total Jan Dec Ij Measureziient,ii I x Day --J_ ji Continuous ...... ............. Permit Issued: Elk River WWTP Page 10 Permit Expires: Limits and Monitoring Requirements Permit#:MN0020788 DRAFT DRAFT DRAFT DRAFT . DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT The Permittee shall comply with the limits and monitoring requirements as specified below. Period: Limits Applicable in the Interim Period WS 001 �— Parameter Limit I Units Limit Type ,Sample Typ�Frequency Notes ercury,Total(as Hg} Monitor nglL Calendar Month Average Jan-Dec Grab 1 x Quarter 4 e j Mohitor l�L Calendar Month Maximum] Jan-Dec Grab 1 x Day 1 i — -- f Only (( ( �� rH _. -- -- Monitor l SU Calendm"month Minimum 7an-Dec Grab 1'x Day i Only IE _ J�---- � Phosphorus,Total(as P) ( M o mg/L 1I Calendar Month Average Jan-Dec 24-Hour FIow j I x Week ' C �� Composite recipitation Monitor in�� Calendar Month Total I Tan-Dec Ii IYleasurement I x Da II Only Solids,Total Suspended(TSS) Monitor mglL Calendar Month Average San-Dec 24-Hour Flow 2—.Wk ��— � _' — - composite Total Suspended(TSS) H Monitor mg./L Calendar Month Maximums Jan-Dec �24-Hour Flow 2 x Week �i Onl - �� .....-- --.��—P � ' __ , Com osite Period. Limits Applicable in the Final Period LA 301 CParameter Lunn Units ! Limit Type - ^Effective Period ample Type requency Notes sonic,Total Dry Weight �F 37.00 I lblacr Cumulative Total �` Sep-Aug l Calculation 1 x Year admium,Total,Dry Weight;(as Cd) t 3 OSt 3 0 lblacr Cumulative Total i; Sep-Aug Calculation 1 x Year Copper,Total,Dry Weight,(as Cu) 1339.00 j' lb � Cumulative Total --i — Sep-Aug �( Calculation ji I x Year :. L— Lead,Total,Dry Weight(as Pb) ( 268.00 Ib/act Cumulative Total Sep-Aug (Ga cl elation 1 x Year 9 Mercury.,Total,Dry Weight,(as Hg) `! 15.00 17 lblacr Cumulative Total Sep-Aug Calculation r I x Year j 1vSolybdenum;Total,Dry Weight(as Gumul alive Tota Sep-Aug t Calculation Monitor lblacr I 1 x Year Only Nickel,Total,Bry Weight,(as iVr) 375.04 lblae Cumulative Total Sep-Aug Calculation 1 x Year Selenrurn,Total,Dry Weight(as Se} j 89.00 Ib!acr i� Cumulative Total �I Sep-Aug Calculation x Year Total,Dry—weight,(as Zn) 25 000 0 i lblacr ' Cumulative Total Sep Aug I Calculation 1.Y Year LA 302 —_ Parameter Lnmt 11 UnitsLimit Type �I Effectwe Period iis T"eFrequency Notes -- (Arsenre Total,Dr Weight 37 00 I lblacr I Cumulative Total Sep Aug Calculation ( I x'Year Y admrum Total Dry Weight (as Cd) ' x.00 I lb<acr Cumulative total Sep-flog I. Calculat�an 1 x Year x I I � _ I _ _ [ l Copper Total-Dr}Weight,(as Cu) 1339,00 ,i lblacr Cumulative Total�i Sep Aug Calculation I� 1 r.Year �ead Total,Dry Weight(as Pb) 2U8 00 I lblacr Cumulative Tata[ ( Sep-Aug Calculation [ x Year _—— -_ _ — Mercury Total Dry Weight,(as IS 00 Ib/act ll CumulatileTotal Sep-Aug j Calculation 1 x 1'e3r Molybdenum,Total,Dry Weight as �lomtor lb?aer �j- Clarnulative Total Sep-Aug Calculation 1 x 1 Cal, t Mo) Only I I; Permit Issued:. Elk River WVTTP Page I I Permit Expires: Limits and Monitoring Requirements Permit#:MN0020788 DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT. DRAFT DRAFT DRAFT DRAFT The Permittee shall comply with the limits and monitoring requirements as specified below. Period. Limits Applicable in the Final Period LA 302 Parameter _ Lumt �FUnits_3I Effective Period Sample Type jFregnency Notes Nickel,Total,Dry Weight,(as Ni) 375.00 lb/acr Cumulative Total j Sep-Aug Calculation � t x Year Selenium Total;Dry Weight(as Se) $9.Q0 Iblacr Cumulative Total Sep-Aug Calculation E i x Year one,Total,Dry Weight,(as Zn) 25QO.OQ Iblacr Cumulative Total Sep-Aug Calculation 1 x Year i _ -_-1 �� E� ---- LA 303 �arameter __ Li t Units_1 Limit Type Effective Period Sample Type Frequency) Notes senic,Total,Dry Weight 37.00 F Ib/acr Cumulative Total Sep-Aug Calculation 1 x Year ;Cadmium,Total,Dry Weight,(as Cd) 35.00 lblacr Cumulative Total Sep-Aug Calculation 1 x Year opper,Total,Dry Weight,(as Cu) 1339.00 Ib/acr G�mutative Total Sep-Aug Calculation I x Year ead,Totai,Dry Weight{as Pb) 26$.00 lblacr Cumulative Total Sep-Aug Calculation 1 x Year 1 I�Ytercury,Total,Dry Weight,(as Hg) `1 15.00 Ib/acr Cumulative Total Sep-Aug Calculation l 1 x Yew loolybdenum,"Total,Dry Weight(as Moonitor ( Iblacr Cumulative Total" Sep Aug- Calculation j 1 x Year Oly - — - -- ickel Total,Dry Weight, 375.00 lblacr Cumulative Total Sep-Aug Calculation i x Year Selenium,Total,Dry Weight(as Se) �� $9.00_ Ib/acr I Cumulative Total Sep-Aug Calculation l x Year _ �_ _ �_ ----- - ine,Total,Dry Weight,(as Zn) 2500.00 Ib/aer Cumulative Total j Sep-Aug Calculation 1 x Year LA 304 Parameter Limit Units L_Limit Type Effective Period ;Sample Type iFrequene Notes Arsenic Tot-al,Dry Weight 37,00 Iblacr CumulatrveTotal Sep-Aug Calculation l� x.Year --_ -----��_ _ _ � E -- _� �► _ _ Cadmium,Total,Dry Weight (as Cd) : 55.00 1 Ib/acr Cumulative Total Sep-.4ug Calculation 1 x Year } _-.._.___.� � Copper Total,Dry Weight,{as Cu) 1339.00 lblacr Cumulative Total Sep Aug Calculation I 7 x Year Lead,Total Dry�t'etglrt(as Ph) 26$QO lblacr Cumulative Total j Sep-Au? Ca[culation I' l x Year ' Mercury Total,Dry Weight,(as Hg) j 15.0 0 Iblacr Cumulative Total i Sep.Aug j Calculation l x Year - L ---:_-� :. i ._._ .-__-�L ___---J� ...... _ Molybdenum,Total Dry Weight(as Monitor Ib/acr Cumulative Total Sep-Aug Ir Calculation I� I x Year NRI On �.. Nickel Total,Dry Weight (as'Ni) j 375 00 'f Ib/acr I Cumulative Total I Sep Aug i Calculatioi�� i x Yeas I ------_------ ------ — i _— Selenium,Total,Dry Weight(as Se) 89 QO lblacr _ Cumulative Total i Sep Aug I Calculation 1� 1 x Year _ -- -- inc,Total Dry Weight,(as Zn) 2500 00 lblacr Cumulative Total �l Sep Aug 'E Calculation( 1 x Year Pennit.Issued: Elk Rivet'NAIWTP Page 12 Permit Expires: Limits and]Monitoring Requirements Permit#:MN0020788 DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT The Permittee shall comply with the limits and monitoring requirements as specified below. Period. Limits Applicable in the Final Period LA 305 Parameter Limit Units Limit Type Effective Period !Sam le Fre uenc ` Note senic,Total,Dry Weight 37 00 Ib/acr Cumulative Total Sep-Aug i Calculation i l x Year admium,Total,Dry Weight,(as Cd) 35.00 , lblacr Cumulative Total Sep-Aug 1C ca elation 1 x Year ]Copper,Total;Dry Weight,{as Cdr) 1339.00 lb/acr Cumulative Total Sep-Aug Calculation 1 x Year ead,Total Dry Weight{as PU} —� 268.00 lb/acr �' Cumulative Total Sep-Aug ( Calf—lculation I x Year Mercury Total,Dry Weight,(as Hg- ) 15.OU lb/acr (i Cumulative Total Sep-Aug Calculation F1 x Year �0�;!-_ ��_-Ii_._._ Molybdenum,Total,Dry Weight(ass Monitor lbtacr Cumulative Total ug Calculation I 1 x Year lMo) Onl �� [ � � ickel,Total,Dry Weight,(as Ni) 375.00 Ib/acr ,i Cumulative Total Ap5 ue g Calculation I x Year ,Selenium,Total,Dry Weight as Se} { 89.00 j lb/acr 1 Cumulative Total Sep-Aug Calculation l x Year Vine,Total,Dry Weight (as Zn) 2500 (lb/acr Cumula tive Total Sep Aug l�Calculation 1 x Year 0.0 LA 306 Parameter Limit �j 1 t��_ LimitTyre �i Effective Period Sam leTYAe(Frequency Notes --- -- Arsenic,Total,Dry Weight 37.00 lb/acr Cumulative Total Sep-Aug �� Calculation l x Year — ICadmrum Total Dry Weight,(as Cd) ( 35.04 J lb!acr IF Cuinulative Total Sep-Aug Calculation l x Year, ---�I 1 hopper,Total,Dry Weight,(as Cu) { 1339.00 lblb/ac cr Cumulative Total Sep-Aug IF Calculation 'E i x Year Lead,Total,Dry Weight(as Ph) 268.00 iE Ib/acr i Cumulative Tota] s Sep-Aug Calculation i I x Year Q�4ercury,Total;Dry Weight(as Hg) 15.40 II ]blacr i Cumulative Total �� Sep Aug Calculation F1 x Year ' bdenum,Total,Dry Weight(as ! Monitor lblacr j Cumulative Total Sep Aug Calculation�) 1 x Year�� Only ,< I�_��_-=.. F i [Nickel,Total,Dry Weight,(as Ni} 375.00 Ib/acr i Cumulative Total Sep-Aug ( Calculation ( I x--Year- ( i [Selenium,Total Dry Weight as Se) $9 00 l"ac Cumulative Total Sep Aug Calculation F x Year ,� Zinc,Total,Dry Weight,(as Zn`) 2500:00 I�Ib/acr ,�� Cumulative Total �I Sep-Aug Calculation 1 SD 001 Parameter I imW Units Limit T w e - - -_-- - _ _ 3_P Effective SampleTie)Fiequencj Notes OD,Carbonaceous 05 Day(20 Deg , 98 kg day Calendar Month Average II Jan-Dec 24-Hour Flow 2 x Week C� -. �. __.`i_ - Composite _ _ - -- _ BOD,Carbonaceous OS Da} (20 Deg j mg/L Calendar Month Average j: tan Dec 4-Hour Flow I1 x Week 2 (I n _.. _? - - ---- --. ' -� Composite I _._, IBOD,Carbonaceous 05 Da} (20 Deg 15, {) kg/day 11 tilaximum Calendar Week Jan-Dec 24 Hour F1owl Week ` C)_ Average -Jt Composite BOD,C nbonaceous OS Day{20 Deg 40 rng2 1 Maximum Calendar Jan Dec 124-Hour Flowl x Week C) i.._. Avcrage ...- --..ii_ --- - Com osite I - __ P _ ) Permit Issued; Elk River WWTP Page 13 Permit Expires: Limits and Monitoring Requirements Permit#:NIN0020788 DRAFT DRAFT DRAFT DRAFT DRAFT. DRAFT DRAFT DRAFT DRAFT DRAFT The Permittee shall comply with the limits and monitoring requirements as specified below. Period. Limits Applicable in the Final Period SD 001 E� P�arameter �L Limit Type Effective Period-]Fs� Frepe:n:cj::Notes ample T��]el Jan-Dee Calculation 2x� Carbonaceous 05 Day(20 Deg 85 '/,o Minimum Calendar Month iF K��rcent Removal Average ecal Coliform,MPN or Membrane 240 #100m1 Calendar Month Geometric! Jan-Dec 77--drab 2 x Week filter 44.5E Mean �ercury,Total(as Hg) 6.9 nOT11 12 Month Moving Average Grab I x Month 2 M F T ercury,Total(as Hg Monitor &L. Calendar Month Average Jan-Dec Grab x Month Onl I oxygen, —1F9---i-tor11 mg /L Cal Month Minimum Jan-Dec Grab x➢av L..Qnlj ------------------- H $U Calendar Month Maximum Jan-Dec —drab—ll I x Day I I SU 11 Calendar Month Minimum Jan-Dee Grab PH ------- 6=0 I x Day I L........... iL Monitor ?A phosphorus,Total(as P) kg/day Calendar Month Average Jan-Dee -Hour Flow 1, 1 x Week ly On Phosphorus,Total(as P) Monitor mglL Calendar Month Average Jan-Dec 1F-4-Hour Flow x Week 12 0� OnI I 5�— J !Solids,Total Suspended(T Calendar Month Average 11 Jan-Dec F24-H..rF. 1,:T2 Wee c--Mp!Isi Solids,Total Suspended(TSS) 3 M Calendar Average Jan-Dec 24-Hour ow x e Composite Calendar Week Jan Dec 24-Hour Fl 2 x Week Isolids,Total Suspended(TSS) 177 kgA�y [Maximum Cal i M-11- I I Average Composite lsolids-,Total Suspended ing/L. Maximum Calendar Week San Dec I24-Hour 0. ]1 Average 7 2 x ----- �alcu Total Suspended(TSS)Percent 85 Jan-Dec ! Week [Rem Minimum Calendar Month Removal Average WS 001 L 11 Parameter Units Frequency �!-O—tes 5e IBOD,Carbonaceous 05 Day(20 Deg ]IFMonitor L Calendar Month Average [ !-D c f4-H..,Flow IFf-'�veek i Composite O-ly-JL Carbonaceous 05 Day(20 Deg I,!AMonitor]I mg/� :Calendar Month Maximum Jan Dec I 24-Hour Flow ��nly C P ji— Monitor Day low onitor mgd Calendar Month Average Jan-Dee int,]Fl Only Contim ous Measurement Monitor Maxim low �jd Calendar Month IU Jan-Dee Measurement 1 1 xDay L 11 ni ......0___�,, ........ j_Continuous T�C ---j w MG Calendar Month flF an-Dec 11 Measurement, I x Day Only J L----1.--_ 11 Continuous.-] Calendar Month Average i Jan-Dee Grab I X Quarter 4 im-c-rcury,Total(as llg j ng/L I x Day i Monitor SU -n I Calendar Month Ma)dmi Jan-Dee Grab SU Calendar Month Minimum Jan-Dec Grab I x Day ....................... I Only - - Phosphorus,Total(as P) -m-O.—itor-1; mg.L Calendar Month.Average Jan-Dec fl Tx -Hour owlll Week ............... 11 a eram x Day ecipitation -]i--in Calendar—114onthTotal art-D, S F {TSS)olids,Total Mmiwr T mg/L Calendar Month Average I Jan—Dec 1 14-Hour Flow 1:1 2 x Week Composite Permit Issued: Elk River WNNITP Page 14 Permit Expires: Limits and Monitoring Requirements Perrait#;MN0020789 DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT The Permittee shall comply with the limits and monitoring requirements as specified below. Period: Lin,its Applicable in the Final Period WS 001 Parameter Limit Units Limit'I e Effective Period W Pie Tykd Fre uenc y Notes Calendar Month Maximum 1 !4�11ow.l7low- only um ;it P 2 x Week Monitor Solids,Total spended(TSS) mg/L WS 302 -�umiETK_�,�tsl_—Limit Type 1:1 Effective Period Sample Fre uenc� Notes I I Composite x Year IArsenic,Total,Dry Weight 7� g/kg i Year Maximum ep- 1 _]F_C_�iW5�s_ivel yew_ Cadmium,Total,Dry Weight, s Cd) 85 Crop Year Sep-Aug lL 11 7!] . hopper,Total,Dry Weight,(as Cu) I Crop Year Maximum El x Year 5 Lead Total,Dry Weight(as Pb) 840 g Maximum !Sep Aug Cmpo_siteIj 1 x Year 5 Mercury,Total,Dry Weight,(as Hg) 57_jm�g/kg IF Crop Year Maximum 1 Sep-Aug Composite 11`1 olybdenum,Total,Dry Weight(as 75 Year Maximum Sep-Aug 11 Comp Year 5— Crop Nickel,Total,Dry Wei 4k_ F -_ Weight,(as Ni) j mg/kg Crop Year Maximum 1 Sep-Aug Composite 1 x Year 5 PC I x Year Nitrogen,Ammonia,Dry Weight Monitor Single Value Sep-Aug Composite Orf Itorl I I - I - F_ Single Value Sep-Aug Composite I itrogen,Kjeldahl,Total,Solid X Year �ractionpry Weight' ]F- Only g L Composite Sep-2_Aug I x Year �71 C,§Iudge 1j Monitor Single Value k F ir Only_- __. Sep-Aug �x`��ear Phosphorus,Total,Dry Weight as P) 1FMomtor I'l % ngle Value Co., only —0/, —, Single_v�lue----—--III Sep Aug Composite mp—osite Potassium,Total,Dry Weight onitor Only_1L Total,Dry_Weight(as Se)117--1-00 -Tmg/kg 1F-1Crop Year Maximum Sep-Aug 1r Composite ii I x Year ar � Solids,Total Monitor , % Single Value Sep Aug omposite I., I Xyew__ only __- }Solids, Volatile,Percent of Toid_VIFMon�itor Single Value Sep-Aug Only Composite I x Year t IZinc,Total,Dry Weight,(as Zn) 1100 m Crop Year Maximum Sep-Aug 1I C oln I x Year 5 ........... :L ............. Permit Issued: Elk River WWTP Page 15 Permit Expires:. Limits and Monitoring Requirements Pennit 4:MN0020788 DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT- The Permittee shall comply with the limits and monitoring requirements as specified below. Notes: I --Analyze immediately. i2--Calculated by adding all of the monthly average values during the last twelve months,starting with the monthly average value for the month of the urrent reporting period,and dividing by twelve. Facilities with a new meructy limit shall,for the first i I months that the limit is effective,indicate {NR}<12 months'in place of a value for the 12 Month Average until the 12th month of monitoring. --EPA method 1631,with clean techniques method 1669,and any revisions to those methods. Please refer to Chapter 4 Mercury Minimization plan or further information. p -EPA method 1631,with clean techniques method 1669,and any revisions to those methods. Please refer to Chapter_ Mercury Minimization lan for further information. I 5--See Tables 3.and 4 in the Monitoring Requirements Section of the Domestic Biosohds,SDS chapter of this permit of further instructions about am lin fr uencies. — I i Permit Issued: Elk River i?VW TP Page 16 ..Pennit Expires: Permit#:MN0020788 DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT Chapter 1. Compliance Schedule 1. Compliance Related Construction Schedule Definitions 1.1 "Initiation of operation"means the date that MPCA determines all components of the the wastewater treatment system are complete and functioning and the project begins operating for the purposes for which it was planned, designed,and built. 1.2 "Completion of construction"means all the construction is complete except for minor weather-related components and conforms to the approved plans and specifications and change orders. 1.3 "Notice to proceed"means a written notice given by the Permittee to the contractor that affixes the contract effective date and the date that the contractor begins performing the work specified in the contract documents. Schedule 1.4 The Permittee must submit a copy of the executed Notice to Proceed to MPCA within 14 days after its execution. 1.5 The Permittee must notify the MPCA in writing at least 14 days before prior to the initiation of operations. Following MPCA staffs concurrence that the facility is adequately prepared,MPCA staff will notify the Permittee that it may initiate operation of the new or upgraded facility. 1.6 The Permittee must notify the MPCA in writing within 14 days after the actual initiation of operations date. 1.7 The Permittee must notify the MPCA in writing at least 14 days before the planned completion of construction date. The MPCA may complete a final inspection. 1.8 The MPCA must submit the following to the MPCA within one year after the initiation of operation date: a. An MPCA-approved certification form that is signed by a professional engineer registered in the state of Minnesota stating that the project meets the performance standards. b. A revised operation and maintenance.manual or a maintenance plan;or a certificate of completion of an opeation and maintenance manual on a form presecribed by the MPCA.At a minimum,this plan must include a detailed discussion of operation and controls,maintenance,sampling and analysis,problem mitigation,VOC management;personnel records and reporting and saftey.This plan must be maintained and updated regularly and made available to MPCA staff upon request. c. One copy of the as-built plans and specifications on microfiche.Full size plan sheets(24 inches by 36 inches or 22 inches by 34 inches)must by provided at 24X reduction and mounted in a white aperture card.Reduced size plan sheets( l I inches by 11 inches)must be provided at l OX reduction.The specifications must be provided at 25X reduction in five-channel,white,6 x 4 microfilm jackets.Documents must be filmed on negative silver film- Chapter 2. Biosolids Land Application 1. authorization 1.1 This permit authorizes the Permittee to store and Iand apply domestic wastewater treatment biosolids in accordance with the provisions in this chapter and Minnesota Rules,eh. 7041. 1.2 Perinittees who prepare bulk biosolids must obtain approval of the sites on which bulk biosolids are applied before they are applied unless they are exceptional quality biosolids. Site application procedures arse set forth in Minnesota Rules,pt.7041.0800. Permit Issued: Elk Rivet"NTP Page 17 Permit Expires: Permit 4:NIN0020788 DRAFT . DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT Chapter 2. Biosolids Land.application 2. Compliance Responsibility 2.:1 The Permittee is responsible for ensuring that the applicable requirements in this chapter and Minnesota Rules ch.7041 are met when biosolids are prepared,distributed, or applied to the land. 3. Notification Requirements 3.1 The Permittee shall provide information needed to comply with the biosolids requirements of Minnesota Rules, ch.7041 to others who prepare or use the biosolids. 4. Pollutant Limits 4.1 Biosolids which are applied to the land must not exceed the ceiling concentrations in Table 1 and must not be applied so that the cumulative amounts of pollutant in Table 2 are exceeded. Table 1 Ceiling Concentrations(dry weight basis) Parameter in units mg/kg Arsenic 75 Cadmium 85 Copper 4300 Lead 840 Mercury 57 Molybdenum 75 Nickel 420 Selenium 100 Zinc 7500 Table 2 Cumulative Loading Limits Parameter in units ibs/acre Arsenic 37 Cadmium 35 Copper 1339 Lead 268' .Mercury 15 Molybdenum not established* Nickel 375 Selenium 89 Zinc 2500 *The cumulative limit for molybdenum has not been established at the time of permit issuance. 5. Pathogen and Vector Attraction Reduction 5.1 Biosolids shall be processed,treated,or be incorporated or injected into the soil to meet one of the vector attraction reduction requirements in Minnesota Rules,pt. 7041.1400. 5.2 Biosoiids shall be processed or treated by one of the alternatives in Minnesota Rules,pt. 7041.1300 to meet the Class A or Class B standards for the reduction of pathogens. When Class B biosolids are applied to the land,the site restrictions in Minnesota Rules,pt.7041.1300 must also be met. Peniiit Issued: Elk River-NATP Page 18 .Permit Expires: Pem it#:Iv1N0020788 DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT Chapter 2. Biosolids Land Application 5, Pathogen and Vector Attraction Reduction 5.3 The minimum duration between application and harvest,grazing or public access to areas where Class B. biosolids have been applied to the land is as follows: a. 14 months for food crops whose harvested parts may touch the soil./biosolids mixture(such as melons, squash,tomatoes,etc.),when biosolids are surface applied,incorporated or injected. b. 20 months or 38 months depending on the application method for food crops whose harvested parts grow in the soil(such as potatoes,carrots,onions,etc.). The 20 month time period is required when biosolids are surface applied or surface applied and incorporated after they have been on the soil surface for at least four(4) months. The 38 month time period is required when the biosolids are injected or surface applied and incorporated within four(4)months of application. c. 30 days for feed crops,other food crops(such as field corn,sweet corn,etc.),hay or fiber crops when biosolids are surface applied,incorporated or injected. d. 30 days for grazing of animals when biosolids are surface applied,incorporated or injected. e. One year where there is a high potential for public contact with the site,(such as a reclamation site located in populated areas,a construction site located in a city,turf farms,plant nurseries, etc.)and 30 days where there is low potential for public contact(such as agricultural land,forest,a reclamation site located in an unpopulated area,etc.,)when biosolids are surface applied,incorporated,or injected. 6. Management Practices 6.1 The management practices for the land application of biosolids are described in detail in Minnesota Rules,pt. 7041.1200 and must be followed lmless specified otherwise in a site approval letter or a permit issued by the MPCA. 6.2 Overall management requirements: a. Biosolids must not be applied to the land if it is likely to adversely affect a threatened or endangered species listed under Section 4 of the Endangered Species Act or its designated critical habitat. b. Biosolids must not be applied to flooded,frozen or snow covered ground so that the biosolids enter wetlands or other waters of the state. c. Biosolids must be applied at an agronomic rate unless specified otherwise by the MPCA in a permit. d. Biosolids shall not be applied within 33 feet of a wetland or waters of the state unless specified otherwise by the 1vIPCA in a permit. 7. Monitoring Requirements 7.1 Representative samples of biosolids applied to the land must be analyzed by methods specified in Minnesota Rule pt. 7041.3200 for the following parameters: arsenic,cadmium,copper,lead,mercury,molybdenum, nickel, selenium,zinc,Kjeldahl nitrogen,ammonia.nitrogen,total solids,volatile solids,phosphorus,potassium and pH. Permit Issued: Elk River WWTP Page 19 Permit Expires: Permit#:MN0020788 DRAFT DRAFTDRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT Chapter 2. )Biosolids Land Application 7. Monitoring Requirements 7.2 At a minimum,biosolids must be monitored at the frequencies specified in Table 3 for the parameters listed above,and any pathogen or vector attraction reduction requirements in Minnesota Rules,pts.70411300 and . 7041.1400 if used to determine compliance with those parts. Table 3 Minimum Sampling Frequencies Biosolids Applied* Biosolids Applied* Frequency (metric tons/365-day period) (tons/365-day period) (times/365-day period) >0 but<290 >0 but<320 1 >=290 but<1,500 >=320 but<I,650 4 >=1,500 but<15,000 >=1,650 but<16,500 6 >=15,000 >=16,500 12 Either the amount of bulk Biosolids applied to the land or the amount of biosolids received by a person who prepares biosolids that are sold or given away in a bag or other container for application to the.land(dry weight basis). 7.3 Representative samples of biosolids that are transferred to storage units and are stored for more than two years shall be analyzed by methods specified in Minnesota Rule pt.7041.3200 for each cropping year they are stored for the following parameters: arsenic,cadmium, copper,lead,molybdenum,nickel, selenium,and zinc. Mercury is specifically NOT included in the stored biosolids analysis because of the short holding time'[28 days]required between sampling and analysis. 7.4 Increased sampling frequencies are specified for the parameters listed in Table 4. Sampling at a frequency at twice the minimum frequencies in Table 3 is required if concentrations listed in Table 4 are exceeded(based on the average of all analyses made during the previous cropping year). Table 4 Increased Frequency of Sampling Parameter(mg./kg dry weight basis) Arsenic 38 Cadmium 43 Copper 2354 Lead 420 Mercury 28 Molybdenum 38 Nickel 210 Selenium 50 Zinc 3750 8. Records 8.1 The Permittee shall keep records of the information necessary to show compliance with pollutant concentrations and loadings,pathogen reduction requirements,vector attraction reduction requirements and management practices as specified in Minnesota Rules;pt. 7041.1600,as applicable to the quality of biosolids produced. 9. Reporting Requirements 9.1 By December 31 following the end of each cropping year,the Pernuttee shall submit a Biosolids Annual Report for the land application of biosolids on a form provided by or approved by the MPC A. The report shall include the.requirements in Minnesota Rules,part 7041.1700. I I Permit Issued: Elk River WWTP Page 20 Permit Expires: Permit#:MN0020788 DRAFT" DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT Chapter 2. Biosolids Land Application 9. Reporting Requirements 9.2 If, during any crapping year,biosolids were transferred,or not land applied,the Permittee shall submit a Biosolids Annual Report by December 31 following the end of the cropping year. The report shall state that biosolids were not land applied,how much was generated,and where they were transferred to. 9.3 For biosolids that are stored for more than two years,the Biosolids Annual Report must also include the analytical data from the representative sample of the biosolids generated during the cropping year. 9.4 The Permittee shall submit the Biosolids Annual Report to: Biosolids Coordinator Minnesota Pollution Control Agency 520 Lafayette Road North St.Paul,Minnesota 55155-4194 9.5 The Permittee must notify the MPCA in writing when 90 percent or more of any of the cumulative pollutant loading rates listed for any Land Application Sites has been reached for a site. Chapter 3. Domestic Wastewater--Mechanical System 1. Bypass Structures I.1 All bypass structures shall be manually controlled and kept locked at all times. 2. Sanitary Sewer Extension Permit 2.I The Permittee is required to obtain a Sanitary Sewer Extension Permit from the MPCA prior to the start of construction of any addition,extension or replacement to the sanitary sewer. 3. Operator Certification 3.1 The Permittee shall provide a Class B state certified operator who is in direct responsible charge of the operation,maintenance and testing functions required to ensure compliance with the terms and conditions of this permit. 3.2 The Pennittee shall provide the appropriate number of operators with a Type IV certification to be responsible for the land application of biosolids or semisolids from commercial or industrial operations. 3.3 If the Permittee chooses to meet operator certification requirements through a contractual agreement,the Permittee shall provide a copy of the contract to the MPCA. The contract shall include the certified operator's name,certificate number, company name if appropriate, and evidence that the operation is being adequately supervised by a properly certified operator. 3.4 The Permittee shall notify the MPCA in writing within 30 days of a change in operator certification or contract status. Mail changes to: Operator Certification,520 Lafayette Road,St.Paul,Minnesota; 55155-4194. Chapter 4. Non-waste Streams --Mercury Management Plan 1. Mercury Pollutant Minimization flan 1.1 Mercury is present in all municipal and many industrial wastewater discharges.Mercury is a powerful neurotoxin that affects human health and the environment. A naturally-occurring element,mercury does not break down into less-harmful substances over time. Instead,mercury released into the environment accumulates in fish and animal tissues, a process known as bioaccumulation. Widespread mercury contamination has prompted the Minnesota Department of Health(MDH)to issue fish consumption advisories throughout the state. Most of Minnesota's impaired waters are contaminated by mercury and other bioaccuniulative toxins. The MPCA is carefully evaluating all mercury discharges in the state. f Pennit Issued:. Elk Aver W WTP Page 21 Per nit Expires: Permit#:MN0020788 DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT , Chapter 4. Non-waste Streams--Mercury Management Plan 1. Mercury Pollutant Minimization Plan 1.2 The Permittee is required to complete and submit a Mercury Pollutant Minimization Plan(MMP)to the MPCA as detailed in this section. If the Permittee has previously submitted a MMP,it must update its MMP and submit the updated MMP to the MPCA. The purpose of the MMP is to evaluate collection and treatment systems to determine possible sources or mercury as well as potential mercury reduction options. Guidelines for developing aMMP are detailed in this section. 1.3 The specific discharge limits for mercury assigned to this facility are detailed in the limits and monitoring section of this permit. Information gained through the MMP process can be used to reduce mercury concentrations to achieve the specified discharge limit. If the facility is currently achieving this limit,the information gained through the MMP can be used to further reduce mercury in the facility's discharge. As part of its mercury control strategy;the Permittee should consider selecting activities based on the potential of those activities to reduce mercury loadings to the wastewater treatment facility. 1.4 The Permittee shall submit a Pollutant Minimization Plan by 180 days after permit issuance. At a minimum,the MMP must include the following: a) A summary of mercury influent and effluent concentrations and biosolids monitoring data using the most recent five years of monitoring data,if available. b) Identification of existing and potential sources of mercury concentrations andlor loading to the facility. As appropriate for your facility,you should consider residential,institutional,municipal,and commercial sources (such as dental clinics,hospitals,medical clinics,nursing homes,schools,and industries with potential for mercury contributions). You should also consider other influent mercury sources,such as stormwater inputs, groundwater(inflow&infiltration)inputs,and waste streams or sewer tributaries to the wastewater treatment facility. c) An evaluation of past and present WWTF operations to determine those operating procedures that maximize mercury removal. d) A summary of any mercury reduction activities implemented during the last five years. e) A plan to implement mercury management and reduction measures during the next five years. 1.5 In addition to the sampling required in the Limits and Monitoring section of this pennit,the Permittee shall sample effluent from the total facility discharge station for Dissolved Mercury and TSS on a quarterly basis throughout the life of this permit.The sampling method is a concurrent grab sample for the two parameters. Dissolved Mercury shall be analyzed using an EPA approved low level mercury analysis method. Samples shall be taken at any time during the calendar quarter and reported on the custom supplemental form provided by the MPCA. The custom supplemental form must be submitted with the DMR for the last month of each quarter. L6 The Permittee shall attain compliance with final mercury limits by permit expiration; Permit Issued: Elk River WWTP Page 22 Per njt Expires: Pertnit r:MN0020788 DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT Chapter 5. Phosphorus Management Plan 1. General Requirements 1.1 Phosphorus is a common constituent in many wastewater discharges and a pollutant that has the potential to negatively impact the quality of Minnesota's lakes,wetlands,rivers and streams. Therefore,.phosphorus discharges are being carefully evaluated throughout the state. The Permittee is required to complete and submit a Phosphorus Management Plan(PMP)to the MPCA as detailed in this section. If the Permittee has already submitted a PMP,the Permittee must update that PMP and submit the updated PMP to the MPCA as detailed in this section. While the PMP does not require specific reductions at this time,the IVIPCA strongly encourages the Permittee to identify and eliminate/reduce sources of phosphorus to,and improve phosphorus management within,the permitted wastewater treatment facility. However,be aware that new or expanding discharges may be required to actively manage and reduce phosphorus,including complying with new or tighter phosphorus effluent limits: For additional information about completing the PMP below,please contact the MPCA's Customer Assistance Center at(800)646-6247. 1.2 The Permittee shall submit a Phosphorus Management Plan(PMP)or an updated PMP to the MPCA 180 days' prior to permit expiration. At a minimum,the PMP shall include the following: a. A summary of influent and effluent concentrations,mass loadings,and percent removal calculations using the most recent five years of:monitoring data,if available. b. Identification of existing and potential sources of elevated phosphorus concentrations and/or loading to the facility. As appropriate for the facility,consider residential,institutional,municipal,and commercial sources. c. An evaluation of past and present WWTF operations to determine those operating procedures that maximize phosphorus removal. d.A summary of any phosphorus reduction activities implemented during the last five years. e.Phosphorus management and reduction goals for the next five years using the information collected in A through D above. f.A plan to implement phosphorus management and reduction measures during the next five years. Chapter 6. Surface Discharge Stations 1. Requirements for Specific Stations 1.1 SD 001: Submit a monthly DMR monthly by 21 days after the end of each calendar month following permit issuance. 2. Sampling Location 2.1 Samples and measurements required by this permit shall be representative of the monitored activity. 3. Surface Discharges 3.1 Floating solids or visible foam shall not be discharged in other than trace amounts. 3.2 Oil or other substances shall not be discharged in amounts that create a visible color film. I Permit Issued: Elk River WWTP Page 23 Permit Expires: Permit#: vI1�T00207$8 DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT Chapter 6. Surface Discharge Stations 3. Surface Discharges 3.3 The Permittee shall install and maintain outlet protection measures at the discharge stations to prevent erosion. 4. Discharge Monitoring Reports 4.1 The Permittee shall submit monitoring results for discharges in accordance with the limits and monitoring requirements for this station. If no discharge occurred during the reporting period,the Permittee shall check the "No Discharge"box on the Discharge Monitoring Report(DMR). Chapter 7. Waste Stream Stations 1. Requirements for Specific Stations 1.1 WS 001: Submit a monthly DMR monthly by 21 days after the end of each calendar month following permit issuance. 2. Special Requirements 2.1 Lift pumps and flow meters shall be calibrated semi-annually: Calibration records shall be kept for three years. 3. Sampling Location 3.1 Grab and composite samples shall be collected at a point representative of total influent flow to the system. 3;2 Influent grab and composite samples shall be collected in the sewer system prior to the primary cell. Chapter 8. Total Facility Requirements 1. General Requirements General Requirements 1.1 Incorporation by Reference. The following applicable federal and state laws are incorporated by reference in this permit, are applicable to the Permittee,and are enforceable parts of this permit: 40 CFR pts. 122.41, 122.42,'136,403 and 503;Minn.R.pts.7001,7041,7045,7050,7060,and 7080;and Minn. Stat. Sec. 115 and 116. 1.2 Permittee Responsibility. The Permittee shall perform the actions or conduct the activity authorized by the permit in compliance with the conditions of the permit and,if required,in accordance with the plans and specifications approved by the Agency.(Minn.R.7001.0150,subp_3,item E) 13 Toxic Discharges Prohibited. Whether or not this permit includes effluent limitations for toxic pollutants,the Permittee shall not discharge a toxic pollutant except according to Code of Federal Regulations,Title 40, sections 400 to 460 and Minnesota Rules,parts 7050.0100 to 7050.0220 and 7052:0010 to 7052.0110 (applicable to toxic pollutants in the Lake Superior Basin)and any other applicable IVIPCA rules. (Minn.R. 7001.1090,subp.1,item A) 1.4 Nuisance Conditions Prohibited. The Pennittee's discharge shall not cause any nuisance conditions including, but not limited to: floating solids;scum and visible oil film,acutely toxic conditions to aquatic life,or other adverse impact on the receiving water. (Minn.R. 7050.0210 subp.2) 1.5 Property Rights. This permit does not convey a property right or an exclusive privilege. (Minn.R. 7001.0150, subp.3,item C) I Permit Issued: Elk River)V"ITP Page 24 Permit Expires: Pelin.il#:MN0020788 DRAFT DRAFT DRAFT DRAFT, DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT Chapter 8. Total Facility Requirements 1. General Requirements 1.6 Liability Exemption. In issuing this permit,the state and the MPCA assume no responsibility for damage to persons,property,or the environment caused by the activities of the Permittee in the conduct of its actions, including those activities authorized,directed,or undertaken under this permit. To the extent the state and the MPCA may be liable for the activities of its employees,that liability is explicitly limited to that provided in the Tort Claims Act. (Minn.R.7001.0 150,subp. 3,item 0) 1.7 The MPCA's issuance of this permit does not obligate the MPCA to enforce local laws,rules,or plans beyond what is authorized by Minnesota Statutes. (Minn.R.7001.0150,subp.3,item D) 1.8 Liabilities- The MPCA!s issuance of this permit does not release the Permittee from any liability,penalty or. duty imposed by Minnesota or federal statutes or rules or local ordinances, except the obligation to obtain the permit.(Minn.R.7001.0150,subp.3,item A) 1.9 The issuance of this permit does not prevent the future adoption by the MPCA of pollution control rules, standards,or orders more stringent than those now in existence and does not prevent the enforcement of these rules,standards,or orders against the Permittee.(Minn.R.7001.0150,subp.3,item B) 1,10 Severability. The provisions of this permit are severable,and if any provisions of this permit,or the application of any provision of this permit to any circumstance,is held invalid, the application of such provision to other circumstances and the remainder of this pernift shall not be affected thereby. 1.11 Compliance with Other Rules and Statutes. The Permittee shall comply with all applicable air quality,solid waste,and hazardous waste statutes and rules in the operation and maintenance of the facility. 1.12 Inspection and Entry. When authorized by Minn.Stat. See. 115.04; 115B.17,subd.4; and 116.09.1,and upon presentation of proper credentials,the agency,or an authorized employee or agent of the agency,shall be allowed by the Permittee to enter at reasonable times upon the property of the Permittee to examine and copy books,papers,records,or memoranda pertaining to the construction,modification,or operation of the facility covered by the pen-nit or pertaining to the activity covered by the permit; and to conduct surveys and investigations,including sampling or monitoring,pertaining to the construction,modification,or operation of the facility covered by the permit or pertaining to the activity covered by the pen-nit. (Minn.R. 7001.0150, subp.3,item 1) 1.13 Control Users. The Permittee shall regulate the users of its wastewater treatment facility so as to prevent the introduction of pollutants or materials that may result in the inhibition or disruption of the conveyance system,, treatment facility or processes,or disposal system that would contribute to the violation of the conditions of this pen-nit or any federal,state or local law or regulation. Sampling 1.14 Representative Sampling. Samples and measurements required by this permit shall be conducted as specified in this permit and representative of the discharge or monitored activity. (40 CPR 121410)(1)) 1,15 Additional Sampling. If the Permittee monitors more frequently than required,the results and the frequency of monitoring shall be reported on the Discharge Monitoring Report(DMR)or another MPCA-approved form for that reporting period. (Minn.R.7001.1090,subp. 1,item E) 1.16 Certified Laboratory, A laboratory certified by the Minnesota Department of Health shall conduct analyses required by this permit. Analyses of dissolved oxygen,pH,temperature and total residual oxidants(chlorine, bromine)do not need to be completed by a certified laboratory but shall comply with manufacturers specifications for equipment calibration and use. (Minn. Stat. Sec. 144,97 through 144.98 and Minn.R. 4740.2010 and 4740.2050 through 4740.2120)(Minn.R.4740,2010 and 4740.2050 through 2120) 1,17 Sample Preservation and Procedure. Sample presenation and test procedures for the analysis of pollutants shall conform to 40 CFR Part 136 and Minn.R. 7041,3200. 1.18 Equipment Calibration: Flow meters,pumps,flumes, lift stations or other flow monitoring equipment used for purposes of determining compliance with permit shall be checked and/or calibrated for accuracy at least twice annually. (Minn. R. 7001.0150, siibp.2,items B and C) Permit Issued: Elk River WWTP Page 24 Permit Expires: Permit#:MN0020788 DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT Chapter 8. Total Facility Requirements 1. General Requirements 1.6 Liability Exemption. In issuing this permit;the state and the MPCA assume no responsibility for damage to persons,property,or the environment caused by the activities of the Pennittee in the conduct of its actions, including those activities authorized,directed,or undertaken under this permit. To the extent the state and the MPCA may be liable for the activities of its employees,that liability is explicitly limited to that provided in the Tort Claims Act.(Minn.R.7001.0150,subp.3,item O) 1.7 The MPCA's issuance of this permit does not obligate the MPCA to enforce local'laws,rules,or plans beyond what is authorized by Minnesota Statutes.(Minn.R.7001.0150,subp.3,item D) L8 Liabilities_ The MPCA's issuance of this permit does not release the Permittee from anyliability,penalty or. duty imposed by Minnesota or federal statutes or rules or local ordinances,except the obligation to obtain the permit.(Minn,R.7001.0150,subp.3,item A) 1.9 The issuance of this permit does not prevent the future adoption by the MPCA of pollution control rules, standards,or orders more stringent than those now in existence and does not prevent the enforcement of these rules,standards,or orders against the Perniittee. (Minn.R..7001.0150,subp.3,item B) 1.10 Severability. The provisions of this permit are severable,and if any provisions of this pennit,or the application of any provision of this permit to any circumstance,is held invalid,the application of such provision to other circumstances and the remainder of this permit shall not be affected thereby. 1.11 Compliance with Other Rules and Statutes. The Permittee shall comply with all applicable air quality, solid waste,and hazardous waste statutes and rules in the operation and maintenance of the facility. 1.12 Inspection and Entry. When authorized by Minn.Stat.Sec. 115.04; 11513.17,subd.4; and 116.091, and upon presentation of proper credentials,the agency,or an authorized employee or agent of the agency,shall be allowed by the Permittee to enter at reasonable times upon the property of the Permittee to examine and copy books,papers,records,or memoranda pertaining to the construction,modification,or operation of the facility covered by the permit or pertaining to the activity covered by the permit; and to conduct surveys and investigations,including sampling or monitoring,pertaining to the construction,modification,or operation of the facility covered by the permit or pertaining to the activity covered by the permit. (Minn.R. 7001.0150, subp.3,item 1) L13 Control Users. The Permittee shall regulate the,users of its wastewater treatment facility so as to prevent the introduction of pollutants or materials that may result in the inhibition or disruption of the conveyance system,, treatment facility or processes,or disposal system that would contribute to the violation of the conditions of this permit or any federal,state or local law or regulation. Sampling 1:14 Representative Sampling. Samples and measurements required by this permit shall be conducted as specified in this permit and representative of the discharge or monitored activity. (40 CFR 122.41 0)(1)) 1.15 Additional Sampling, If the Permittee monitors more frequently than required,the results and the frequency of monitoring shall be reported on the Discharge Monitoring Report(DMR)or another MPCA-approved form for that reporting period. (Minn.R.7001.1090, subp. 1,item E) 1.16 Certified Laboratory. A;laboratory certified by the Minnesota Department of Health shall conduct analyses required by this permit. Analyses of dissolved oxygen,pH,temperature and total residual oxidants(chlorine, bromine)do not need to be completed by a certified laboratory but shall comply with manufacturers specifications for equipment calibration and use. (Minn.Stat. Sec. 144.97 through 144.98 and Minn.R. 4740.2010 and 4740.2050 through 4740.2120)(Nliim.R.4740.2010 and 4740.2050 through 2120) 1.17 Sample Preservation and Procedure. Sample preservation and test procedures for the analysis of pollutants shall conform to 40 CFR Part 136 and Minn.R. 7041.3200. 1.18 Equipment Calibration:Flow meters,pumps,flumes,lift-stations or other flow monitoring equipment used for purposes of determining compliance with permit shall be checked and/or calibrated for accuracy at least twice annually. (Minn.R. 7001.0150,subp.2,items Band C) Permit Issued: Elk River WNVTP Page 25 Permit Expires: Pe nit :MN0020788 DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT Chapter 8. Total Facility Requirements 1. General Requirements 1.19 Maintain Records, The Permittee shall keep the records required by this permit for at least three years, including any calculations,original recordings from automatic monitoring instruments,and laboratory sheets. The Permittee shall extend these record retention periods upon request of the MPCA.The Permittee shall maintain records for each sample and measurement.The records shall include the following information(Minn. R. 7001.0150, subp.2,item C): a. The exact place,date,and time of the sample or measurement; b. The date of analysis; c. The name of the person who performed the sample collection,measurement,analysis,or calculation; and d. The analytical techniques,procedures and methods used; and e. The results of the analysis. 1.20 Completing Reports. The Permittee shall submit the results of the required sampling and monitoring activities on the forms provided,specified,or approved by the MPCA. The information shall be recorded in the specified areas on those forms and in the units specified. (Minn.R.7001.1090,subp. 1,item D;Minn.R.7001.0150, subp.2,item B) Required forms may include: Supplemental Report Form(Supplemental) Individual values for each sample and measurement must be recorded on the Supplemental which,if required, will be provided by the MPCA. Supplementals shall be submitted with the appropriate DMRs.You may design and use your own Supplemental;however it must be approved by the MPCA. Note: Required Summary 'information MUST also be recorded on the DMR. Summary information that is submitted ONLY on the Supplemental does not comply with the reporting requirements. 1.21 Submitting Reports. DMRs and Supplementals shall be submitted to: MPCA Attn: Discharge Monitoring Reports 520 Lafayette Road North St.Paul,Minnesota 55155-4194. DMRs and Supplementals shall be postmarked by the 21 st day of the month following the sampling period or as otherwise specified in this permit. A DMR shall be submitted for each required station even if no discharge occurred during the reporting period. (Minn.R.7001.0150,subps.2.13 and 3.11) Other reports required by this permit shall be postmarked by the date specified in the permit to: MPCA Attn: WQ Submittals Center - 520 Lafayette Road North St.Paul,Minnesota 55155-4194 1.22 Incomplete or Incorrect Reports. The Permittee shall immediately submit an amended report or DMR to the MPCA upon discovery by the Pemtittee or notification by the MPCA that it has submitted an incomplete or incorrect report or DMR. 'The amended report or DMR shall contain the missing or corrected data along with a cover letter explaining the circumstances of the incomplete or incorrect report.(Minis.R.7001.0150 subp. 3, item G) .................... ............ ............ Permit Issued: Elk River WWTP Page 26 Permit Expires: Permit 4:MN0020788 DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT Chapter 8. Total Facility Requirements 1. General Requirements 1.23 Required Signatures. All DMRs,forms,reports,and other documents submitted to the MPCA shall be signed by the Permittee or the duly authorized representative of the Permittee. Minn.R. 7001.0150,subp.2,item D. The person or persons that sign the DMRs,forms,reports or other documents must certify that he or she understands and complies with-the certification requirements of Minn.R.,7001,0070 and 7001.0540,including the penalties for submitting false information. Technical documents, such as design drawings and specifications and engineering studies required to be submitted as part of a permit application or by permit conditions,must be certified by a registered professional engineer.(Minn.R. 7001.0540) 124 Detection Level. The Permittee shall report monitoring results below the reporting limit(RL)of a particular instrument as "<"the value of the RL. For example,if an instrument has a RL of 0.1 mg/L and a parameter is not detected at a value of 0.1 mg/L or greater,the concentration shall be reported as"<O.1 mg/L." "Non-detected," "undetected," "below detection limit,"and"zero" are unacceptable reporting results, and are permit reporting violations. (Minn.R. 7001.0150,subp.2,item B) Where sample values are less than the level of detection and the permit requires reporting of an average,the Permittee shall calculated the average as follows: a. If one or more values are greater than the level of detection,substitute zero for all nondetectable values to use in the average calculation. b. If all values are below the level of detection,report the averages as"<"the corresponding level of detection. c. Where one or more sample values are less than the level of detection,and the permit requires reporting of a mass,usually expressed as kg/day,the Permittee shall substitute zero,for all nondetectable values. (Minn.R. 7001.0150,subp.2,item B) 1.25 Records. The Permittee shall,when requested by the Agency,submit within a reasonable time the information and reports that are relevant to the control of pollution regarding the construction,modification,or operation of the facility covered by the permit or regarding the conduct of the activity covered by the permit.(Minn.R. 7001.0150,subp.3,item H) 1.26 Confidential Information. Except for data determined to be confidential according to Minn. Stat. See. 116.075, subd.2, all reports required by this permit shall be available for public inspection. Effluent data shall not be considered confidential. To request the Agency maintain data as confidential,the Permittee must follow Minn. R. 7000.1300_ Noncompliance and Enforcement 1.27 Subject to Enforcement Action and.Penalties. Noncompliance with a term or condition of this permit subjects the Permittee to penalties provided by federal and state law set forth in section 309 of the Clean Water Act; United States Code,title 33,section 1319,as amended; and in Minn. Stat. Sec. 115.071 and 116.072,including monetary penalties,imprisonment,or both. (Minn.R. 7001.1090, subp. 1,item B) 1.28 Criminal Activity. The Permittee may not knowingly make a false statement,representation,or certification in a. record or other document submitted to the Agency. A person who falsifies a report or document submitted to the Agency,or tampers with,or knowingly Tenders inaccurate a monitoring device or method required to be maintained under this permit is subject to criminal and civil penalties provided by federal and state law. (Minn. R. 7001.0150, subp.3,. item G.,7001.1090,subps. 1,items G and H and Minn. Stat. Sec. 609.671) 1,29 Noncompliance Defense. It shall not be a defense for the Permittee in an enforcement action that it would have been necessary to halt or reduce the permitted activity in order to maintain compliance with the conditions of this permit.(40 CFR 122.41(c)) ................ Pen-nit Issued: Elk River WWTP Page 27 Permit Expires: Permit#:NlNO0207 88 DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT Chapter 8. 'Total Facility Requirements 1. General Requirements 1.30 Effluent Violations. If sampling by the Permittee indicates a violation of any discharge limitation specified in this permit,the Permittee shall immediately make every effort to verify the violation by collecting additional samples,if appropriate,investigate the cause of the violation,and take action to prevent future violations. Violations that are determined to pose a threat to human health or a drinking water supply,or represent a significant risk to the environment shall be immediately reported to the Minnesota Department of Public Safety Duty Officer at 1_(800)422-0798 (toll free)or(651)649-5451 (metro area).In addition,you may also contact the MPCA during business hours. Otherwise the violations and the results of any additional sampling shall be recorded on the next appropriate DMR or report. 1.31 Unauthorized Releases of Wastewater Prohibited. Except for conditions specifically described in Minn.R. 7001.1090,subp. 1,items J and K.all unauthorized bypasses,overflows,discharges,spills,or other releases of wastewater or materials to the environment,whether intentional or not,are prohibited. However,the MPCA will consider the Permittee's compliance with permit requirements,frequency of release,quantity,type,location, and other relevant factors when determining appropriate action.(40 CFR 122.41 and Minn.Stat.Sec 115.061) . 1.32 Discovery of a release. Upon discovery of a release,the Permittee shall: a.Take all reasonable steps to immediately end the release. b.Notify the Minnesota Department of Public Safety Duty Officer at 1(800)422-0798 (toll free)or (651)649-5451 (metro area)immediately upon discovery of the release. In addition,you may also contact the . MPCA during business hours at 1(800)657-3864. c.Recover as rapidly and as thoroughly as possible all substances and materials released or immediately take other action as may be reasonably possible to minimize or abate pollution to waters of the state or potential impacts to human health caused thereby. If the released materials or substances cannot be immediately or completely recovered,the Permittee shall contact the MPCA. If directed by the MPCA,the Permittee shall consult with other local,state or federal agencies(such as the Minnesota Department of Natural Resources and/or the Wetland Conservation Act authority)for implementation of additional clean-up or remedation activities in wetland or other sensitive areas. d. Collect representative samples of the release.The Permittee shall sample the release for parameters of concern•imtnediately following discovery of the release.The Permittee may contact the MPCA during business hours to discuss the sampling parameters and protocol. In addition,Fecal Coliform Bacteria samples shall be collected where it is determined by the Permittee that the release contains or may contain sewage. If the release cannot be immediately stopped,the Permittee shall consult with MPCA regarding additional sampling requirements. Samples shall be collected at least,but not limited to,two times per week for as long as the release continues. e. Submit the sampling results as directed by the MPCA. At a minimum,the results shall be submitted to the MPCA with the next DMR. Pero it Issued: Elk River VVWTP Page 28 Permit Expires: Permit#:N N0020788 DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT Chapter 8. Total Facility Requirements 1. General Requirements 1.33 Upset Defense. In the event of temporary noncompliance by the Permittee with an applicable effluent limitation resulting from an upset at the Permittee's facility due to factors beyond the control of the Permittee,the Permittee has an affirmative defense to an enforcement action brought by the Agency as a result of the noncompliance if the Permittee demonstrates by a preponderance of competent evidence: a. The specific cause of the upset; b. That the upset was unintentional; c. That the upset resulted from factors beyond the reasonable control of the Permittee and did not result from operational error,improperly designed treatment facilities,-inadequate treatment facilities,lack of preventative maintenance;or increases in production which are beyond the design capability of the treatment facilities; d. That at the time of the upset the facility was being properly operated; e. That the Permittee properly notified the Commissioner of the upset in accordance with Minn.R.7001.1090, subp. 1,item I;and f. That the Permittee implemented the remedial measures required by Minn.R.7001.0150,subp.3,item J. Operation and Maintenance 1.34 The Permittee shall at all times properly operate and maintain the facilities and systems of treatment and control, and the appurtenances related to them which are installed or used by the Permittee to achieve compliance with the conditions of the permit. Proper operation and maintenance includes effective performance,adequate funding,adequate operator staffing and training,and adequate laboratory and process controls,including appropriate quality assurance procedures. The Permittee shall install and maintain appropriate backup or auxiliary facilities if they are necessary to achieve compliance with the conditions of the permit and,for all permits other than hazardous waste facility permits,if these backup or auxiliary facilities are technically and economically feasible Minn.R.7001.0150.subp. 3,item F. 1.35 In the event of a reduction or loss of effective treatment of wastewater at the facility,the Permittee shall control production or curtail its discharges to the extent necessary to maintain compliance with the terms and conditions of this permit.The Permittee- shall continue this control or curtailment until the wastewater treatment facility has been restored or until an alternative method of treatment is provided,(Minn.R. 7001.1090,subp.1,item C) 1.36 Solids Management. The Permittee shall properly store,transport,and dispose of biosolids,septage, sediments, residual solids,filter backwash,screenings,oil,grease, and other substances so that pollutants do not enter surface waters or ground waters of the state. Solids should be disposed of in accordance with local,state and federal requirements. (40 CFR 503 and Minn.R.7041 and applicable federal and state solid waste rules) 1.37 Scheduled Maintenance. The Permittee shall schedule maintenance of the treatment works during non-critical water quality periods to prevent degradation of water quality, except where emergency maintenance is required to prevent a condition that would be detrimental to water quality or human health.(Minn.R. 7001.0150. subp. 3,item F and Minn.R.7001.0150. subp.2,item B) 1.38 Control Tests. In-plant control tests shall be conducted at a frequency adequate to ensure compliance with the conditions of this permit. (Minn.R.7001.0150.subp. 3,item and Minn.R. 7001:0150. subp: 2,item B)- Changes to the Facility or Permit Permit Issued: Elk River W WTP Page 29 Permit Expires: Permit#:MN0020788 .RAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT Chapter 8. Total Facility Requirements 1. General Requirements 1.39 Permit Modifications. No person required by statute or rule to obtain apermit may construct, 'install,modify,or operate the facility to be permitted,nor shall a person commence an activity for which a permit is required by statute or rule until the Agency has issued a written permit for the facility or activity. (Minn.R.7001.0030) Permittees that propose to make a change to the facility or discharge that requires a permit modification must follow Minn.R. 7001.0190, If the Permittee cannot determine whether a permit modification is needed,the Permittee must contact the MPCA prior to any action. It is recommended that the application for permit modification be submitted to the MPCA at least 180 days prior to the planned change. 1.40.Construction. No construction shall begin until the Permittee receives written approval of plans and specifications from the MPCA(Minn. Stat. Sec..115.03(f)). Plans,specifications and MPCA approval are not necessary when maintenance dictates the need for installation of new equipment,provided the equipment is the same design size and has the same design intent. For instance, a broken pipe,lift station pump,aerator,or blower can be replaced with the same design-sized equipment without MPCA approval. If the proposed construction is not expressly authorized by this permit,it may require a permit modification. If the construction project requires an Environmental Assessment Worksheet under Minn.R.4410,no construction shall begin until a negative declaration is issued and.all approvals are received or implemented. 1.41 Report Changes..The Permittee shall give advance notice as soon as possible to the MPCA of any substantial changes in operational procedures,activities that may alter the nature or frequency of the discharge,and/or material factors that may affect compliance with the conditions of this permit.(Minn,.R.7001.0150,subp.3, item M) 1.42 Chemical Additives.The Permittee shall receive prior written approval from the MPCA before increasing the use of a chemical additive.authorized by this permit,or using a chemical additive not authorized by this permit, in quantities or concentrations that have the.potential to change the characteristics,nature and/or quality of the discharge. The Permittee shall request approval for an increased or new use of a chemical additive at least 60 days,or as soon as possible,before the proposed increased or new use. This written request shall include at least the following information for the proposed additive: a. The process for which the additive will be used; b. Material Safety Data Sheet(MSDS)which shall include aquatic toxicity,human health,and environmental fate information for the proposed additive; c. A complete product use and instruction label; d. The commercial and chemical names and Chen eal Abstract Survey(CAS)number for all ingredients in the additive(If the MSDS does not include information on chemical composition,including percentages for each ingredient totaling to 100%,the Pern-tittee shall contact the supplier to have this information provided); and e. The proposed method of application,application frequency,concentration,and daily average and maximum rates of use. Upon review of the information submitted regarding the proposed chemical additive,the MPCA may require that additional information be submitted for consideration. Also,this pernut may be modified to restrict the use or discharge of a chemical additive and include additional influent and effluent monitoring requirements. (Minn. R. 7001.0170) i i Permit Issued: Elk River WWTP Page 30 Permit Expires; Pennit#:MN0020788 DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT Chapter 8. Total Facility Requirements 1. General Requirements 1.43 MPCA Initiated Permit Modification, Suspension,or Revocation. The MPCA may modify or revoke and reissue - this permit pursuant to Minn.R.7001.0170. The MPCA may revoke without reissuance this permit pursuant to Minn.R.7001.0180; 1.44 TMDL Impacts. Facilities that discharge to an impaired surface water,or to a watershed or drainage basin that contains impaired waters,maybe required,at some future date,to comply with additional permits,or permit requirements,including additional restriction or relaxation of limits and monitoring as authorized by the CWA 303(d)(4)(A))and 40 CFR 122.44.1.2.i,based on the conclusions of any applicable US EPA approved Total Maximum Daily Load(TMDL)studies,their associated implementation plans or additional sampling or monitoring. 1.45 Permit Transfer. The permit is not transferable to any person without the express written approval of the Agency after compliance with the requirements of Minn.R.7001.0190. A person to whom the permit has been transferred shall comply with the conditions of the permit, (Minn.R.,7001.0150,subp.3,item N) 1.46 Facility 1 Closure. The Permittee is responsible for closure and postelosure care of the facility, The Permittee shall notify the MPCA,of a significant reduction or cessation of the activities described in this permit at least 180 days before the reduction or cessation. The MPCA may require the Permittee to provide to the_MPCA a facility Closure Plan for approval. Facility closure that could result in a potential long-term water quality concern,such as the ongoing discharge of wastewater to surface or ground water,may require a permit modification or reissuance. The MPCA may require the Permittee to establish and maintain financial assurance to ensure performance of certain obligations under this permit,including closure,postclosure care and remedial action at the facility. If financial assurance is required,the amount and type of financial assurance,and proposed modifications to previously MPCA-approved financial assurance,shall be approved by the MPCA. (Minn. Stat. See, 116.07, subd.4) 1.47 Permit Reissuance. If the Penriittee desires to continue permit coverage beyond the date of permit expiration, the Permittee shall submit an application for reissuance at least 180 days before permit expiration. If the Permittee does not intend to continue the activities authorized by this pen-nit after the expiration date of this permit,the Permittee shall notify the MPCA in writing at least 180 days before permit expiration. If the Permittee has submitted a timely application for permit reissuance,the Permittee may continue to conduct the activities authorized by this permit,in compliance with the requirements of this permit,until the MPCA_ takes final action on the application,unless the MPCA determines any of the following(Minn.R.7001.0040 and 7001.0160): a. The Permittee is not in substantial compliance with the requirements of this permit,or with a stipulation agreement or compliance schedule designed to bring the Permittee into compliance with this permit; b. The MPCA,as a result of an action or failure to act by the Permittee,has been unable to take final action on the application on or before the expiration date of the permit; c. The Pennittee has submitted an application with major deficiencies or has failed to properly supplement the application in a timely manner after being informed of deficiencies. Appendix C Significant Industrial User Agreements (Currently There Are No Significant Industrial Users) Appendix D Public Hearing Presentation Material, Notice and Publication, and Comments 2/28/2013 City Eidwftll !U0 ver wft Wastewater Treatment Facility Plan March 2013 BQ LTdiV � dti/11=1V K IP=JC. Purpose • Provide the City with the Necessary Information to Plan for Needed and Required Upgrades to the Wastewater System • Provide Options to Meet the Requirements of the MN Pollution Control Agency (MPCA) • Estimate Costs for All Needed and Recommended Improvements • Comply with Requirements Necessary to Obtain Public Facilities Authority (PFA) Funding @Q�TQr.J$11/YENF°4, INC. Cumming Eopioaers&Sumps 1 2/28/2013 Design Parameters • Design Year - 2035 • Population Projections — Option 1 (All Users within Urbane Service Area ): 35,467 Equivalent Users — Option 2 (All Users Including Future Developement Outside the Urban Service Area): 45,388 Equivalent Users BCD LTOfV rG C1_1t=.rV FC IiV C:::. il1,h Y 1 r 4] it 1 MMNhM. •� � `mss. 0 3.400 Feet Future Development Within The Urban Se nice Area 1. --— FI,g Z2 t BQ�TQrV$.MENhC. INC. [oflsull ing Engineers&Sumps 2 2/28/2013 • ICI)ls----- i°.` I _ Lj � '� . — ==_ t Y l 4} v+ vex 2a o Zeus Fee - 7n ,�i Fulure Development .. A �. Outside The Ifr6en { I Service Area �� lr FI%gu1e 2.3 r if Design Parameters (cont.� Average Dry Weather Flow(ADW) mg mg " Average Wet Weather Flow(AW W-30 1.302 mgd 3.55 mgd 4.54 mgd Days) Peak Hourly Wet Weather Flow(PHWW) NA 5.68 mgd Ad. 7.27 mgd Peak Instant Wet Weather Flow(PIWW) NA 7.10 mgd 9.08 mgd Average CBOD/Day 2,848 lb/clay 8,518 lb/day in 10,899 lb/day Average TSS/day 1,549 lb/day 7,808 lb/day 9,990 lb/day Average TKN/day NA 21316/day No 273 lb/day Average Phosphorous/day 67 lb/day 1,065 lb/day 1,362 lb/day BQ L---T-Q@4$PAEN E°C,. INC. Cumming Engmers&Surveyors 3 2/28/2013 Existing WWTF - Summary • Mechanical Activated Sludge Facility — Two Fine Screens — Grit Removal — Two Primary Clarifiers — Two Trickling Filters — Aeration Basin (Structure Only-Not in Service) — Three Final Clarifiers — Six Sand Filters — Ultraviolet Disinfection (UV) — Anaerobic Digesters and Sludge Storage tanks • Discharges to the Mississippi River • Several Treatment Units Do Not Meet the Required Capacity for the Design Year 2032 r'�C7LT01�J 8.I\/l�lV K, INC, 7 =L cry law r BC?IL—rc="$.Ih/IEfV K. IfVC~• Comil inp Engineers&Sumps 4 2/28/2013 Existing WWTF — Needed Improvements • Grit Removal — Addition of a Grit Cyclone • Primary Clarifiers — Construct Two New 40-foot Diameter Clarifiers — Provide Improvements to Sludge Handling Equipment • Trickling Filters — Improvements to the Recirculation Pumping and Controls — Improvements to the Distributor Arm, Access Way, and Ventilation System BQ LTOfV & MAt=.NK IP-,J 9 Existing WWTF — Needed Imp. (cont.) • Activated Sludge Process — New Aeration Basin with Provisions for Biological Phosphorus Removal — Sludge Pumping Building — Blower Building • Final Clarifiers — Provide Covers for the Three Existing Final Clarifiers • Filters — Update Controls to Optimize Operations — Provide a Chlorine Feed System to Inhibit Biological Growth BQ L---T—Q@4$nfif=N F--, INC. Cumming Eopioaers&Sumps 5 2/28/2013 Existing WWTF — Needed Imp. (cont.� • Disinfection — Install New UV Equipment in the Existing Spare Channel • Electrical/Controls — Update Controls System to Provide a Centralized Control System for All Treatment Units • Biosolids Handling — Use Anaerobic Digestion Process to Reduce Biosolids Volume — Provide Sludge Pumping to Great River Energy(GKE) • Other — Construct a New Control Building with Garage Space BC LTI'Dr-,J 8.I\/I E r-,j I N C. 11 _ 1 1 I 1 I 1 ` BOLTCafV 8.Ih/IEfV K. INC. Comil inp Engineers&Sumps 6 2/28/2013 r El' yrY r f ` I � I J 80—1-c="$.M EN K. I"C. COn501,1:Bipinnpis&Surreyors Comparison of Design Options Required improvements Differences Grit Removal New Cyclone New Cyclone None Primary Clarifiers Two 40-foot Clarifiers Two 40-foot Clarifiers None Trickling Filters Pump/Controls Upgrade Pump/Controls Upgrade None Activated Sludge 1.8 Million Gallons 2.6 Million Gallons Option 2 Requires More Aeration Volume Final Clarifiers New Covers New Covers None Filters Controls/Chlorination Controls/Chlorination None UV Disinfection One New UV Unit Two New UV Units Option 2 Requires an Additional New Unit BCLTC--fV$MEN hC. INC. Emu11inp Engineers&Suireynrs 7 2/28/2013 Li uid Stream Im rovements Cost Estimate Item Cost Design Option No.1 Design Option No.2 Mobilization $300,000 $300,000 Site Work $600,000 $600,000 Site Pi in /Valves $200,000 $200,000 Grit Cyclone $15,000 $15,000 Clarifier Equipment forExistin and New 4 $500,000 $500,000 New Clarifier Structure 2 $200,000 $200,000 Trickling Filter Im rovements $250,000 $250,000 Activated Sludge Basins $1,350,000 $1,950,000 Fine Pore Diffusers $140,000 $200,000 Blowers $250,000 $300,000 Secondary Clarifier Covers 3 $300,000 $300,000 RAS/WAS Building and Pumps $200,000 $200,000 Filter Chlorination System $30,000 $30,000 UV Upgrades $200,000 $400,000 Blower/Sludge Pum in Building $200,000 $200,000 Electrical/Contrels $1,500,000 $1,700,000 New Control Building/Garage $1,200,000 $1,200,000 Total Construction Cost $7,435,000 $8,495,000 Contin enc 10% $744,000 $850,000 En ineerin /Admin 15% $1,115,000 $1,274,000 Total Project Cost $9,294,000 $10,619,000 BC7o—TC7y,J r-I E=—[V FC, I r---A C. 15 Biosolids Handling Alternatives • Construct a Heat Drying Facility — Small Footprint — Produces Class A Biosolids — Reduces Volume Required for Land Application — High Capital Cost — Higher Operating Cost • Expand Anaerobic Digestion System — Extremely Large Footprint — Requires Large Biosolids Storage Volume — Large Quantity of Biosolids to be Land Applied — High Capital Costs — Not Practical Given the Land Constraints of the Site BOL—rc--wV S.r44 E—= ir-C— [mulling Engineers&Surveyors 8 2/28/2013 Biosolids Handling Alt.'s (Cont.) • Pump to Great River Energy (GRE) for Incineration — Minimal Capital Costs — Extremely Low Operating Costs — Minimal Operator Time Requirements • Regionalization (City of Buffalo) — Minimal Capital Cost — High Treatment and Hauling Costs — Not Economically Feasible as a Long Term Solution — Should be Discussed with the City of Buffalo as a Backup Plan BQ LTOfV & N-1l=NK IiV 0. 17 [oflxulliap Eopmaeis&Sulreynts 18 9 2/28/2013 1 1 BOLT`C�1�7 8.Il17�1V FC. I I°.tC. fantulllng Fnginners&5urreyo�s Biosolids Handling Cost Estimate Heat Drying Item Cost Mobilization $300,000 Site Work $200,000 Site P' m $100,000 Buildin 12,000 s ft $1,560,000 Polymer Feed System $50,000 Pumps/piping $150,000 Dewatering Equipment $600,000 Sludge Stora eAeration Equipment $150,000 Heat Drying Equipment $4,000,000 Conveying Systems $50,000 Odor Control S stem $150,000 Mechanical $750,000 Electrical/Controls $800,000 Total Construction Cost $8,860,000 Contingency 10% $886,000 En ineerin /Admin(15%) $1,329,000 Total Project Cost $11,075,000 BQL-°Caf,4$Ih/IEr-.IhC. IfVC. Ca0lu9110g Engmaef6&Sumps 10 2/28/2013 Biosolids Handling Cost Estimate Pump to Great River Energy Item Cost Site Work/Site Piping $150,000 Pumps $125,000 Sludge Storage Aeration Equipment $175,000 Electrical/Controls $90,000 Total Construction Cost $540,000 Contingency 10% $54,000 En ineerin /Admin(15%) $81,000 Total Project Cost $675,000 EE3(=)LTC7r-J$-r/i INK Ir=J C. 21 Recommendations • Implement Option 2 (Except UV) • Implement Biosolids Pumping to GRE • Discuss a Biosolids Treatment Contract with the City of Buffalo for Emergency Needs. • Keep Existing Biosolids Land Application Sites for Backup Biosolids Disposal Plans. BQ L--T'Qr-4$PA E—= INC• Cumming Enginters&Sumps 11 2/28/2013 Funding & Financing Options • Bonding • Assessment • State Revolving Fund Loan (PFA) • Grants • Cash Reserves BQ LTOf',J & N-1 P=rVK IP-,J 23 Impact on Wastewater User Rates Percent Allocation of SAC Revenue to WWTF 100% 75% 50% 25% Loan Cost 20 Years 4% $794,200 $794,200 $794,200 $794,200 SAC Yearly Revenue Allocated to WWTF $956,300 $717,200 $478,100 $239,100 Revenue Needed from User Fees -$162,000 $77,000 $316,100 $555,200 Cost Increase per 1,000 Gallons NA $0.18 $0.72 $1.27 Monthly Increase for 5,000 Gallon User NA $0.88 $3.61 $6.34 BQ�TQt•.J$PAE=N hC, INC. Cumming Eopioaers&Sumps 12 2/28/2013 Proposed Improvement Schedule Item Completion Date Submit Facility Plan to MPCA for review and approval March 2013 City requests placement on MPCA Project Priority List March 2013 MPCA reviews and approves Facility Plan. April—July 2013 City requests placement on the MPCA 2013 Intended Use Plan May 2013 Prepare plans and specifications for the wastewater treatment facility August—November 2013 improvements 2013 Intended Use Plan is approved by MPCA. September 2013 Submit plans and specifications to MPCA for review and approval. December 2013—February 2014 City advertises,open bids,and accepts construction bids for facility March—Apri12014 improvements. Initiate construction ofwastewater treatment facility improvements. May 2014 Complete construction of wastewater treatment facility improvements May 2016 and meet discharge standards. IgOL1P'C X14 8.PIA M"K, 1r14 25 ill Questions / Discussion River e. QOL—r(="8-N4 E=—" — INC-- Consurliog Engineers&Surveyors 13 Appendix E SERP Mailing List of4l@121 Minnesota Pollution State Environmental Review Process JW Control Agency (SERP) Mailing List (Local)* Form 520 Lafayette Road St.Paul,h%55155-4194 Clean Water State Revolving Fund Minnesota Rules 7077.0272, subp. 2.a.A. Minnesota Rules 7077.0277, subp. 3.A. Doc Type:Environmental Information Worksheet Municipality name: City of Elk River Project number: Bolton and Menk, Inc. Project#T21.104758 Public Notice Address Information This list of addresses for public notice purposes is submitted as required. Please type names and addresses on this form and return to the MPCA Staff Engineer. 1. The Honorable State Senator: 6. City Administrator/Clerk: Mary Kiffineyer Calvin Portner, City Administrator 123 State Office Building 13065 Orono Parkway 100 Dr. Martin Luther King Jr. Blvd Elk River, MN 55330-1692 St. Paul, MN 55155-1206 2. The Honorable State Representative: 7. Engineering Consultant: Nick Zerwas Seth Peterson, P.E. 303 State Office Building Bolton and Menk, Inc. 100 Dr. Martin Luther King Jr. Blvd 12224 Nicollet Avenue St. Paul, MN 55155-1206 Burnsville, MN 55337-3867 3. The Honorable County Board Chair: 8. County Planning and Zoning Office: Sherburne County Commissioner District#1 Sherburne County Government Center Bruce Anderson Zoning Administration 13880 Business Center Dr. NW 13880 Business Center Dr. NW Elk River, MN 55330-1692 Elk River, MN 55330-1692 4. The Honorable Mayor: 9. Watershed District(if established): John Dietz 13065 Orono Parkway Elk River, MN 55330-1692 5. The Honorable Township Board Clerk:— 10. Regional Development Commission: This list should be considered minimum. If a more substantial mailing list is available for the Public Participation Program, it should be submitted along with this typed Mailing List. Use additional pages, if necessary. ** Include if any portion of the project(including the facility, interceptor, influent or outfall lines)will be located in the township(s). www.pca.state.mn.us 651-296-6300 800-657-3864 TTY 651-282-5332 or 800-657-3864 • Available in alternative formats wq-wwtp2-16 • 8117112 Page 1 of 3 Interested Citizens: Interested Groups:*** 1. 1. 2. 2. 3. 3. 4. 4. 5. 5. 6. 6. 7. 7. 8. 8. 9. 9. 10. 10. *** i.e., homeowners associations, environmental, business, civic, etc.,organizations www.pca.state.mn.us 651-296-6300 800-657-3864 TTY 651-282-5332 or 800-657-3864 Available in alternative formats wq-wwtp2-16 • 8117112 Page 2 of 3 Property Owners:**** 1. 6. 2. 7. 3. 8. 4. 9. 5. 10. **** Property owner list should include all property owners of the site to be, or which has been previously acquired. For pond systems, include the property owner(s)of the pond site, spray irrigation site(s)and all property owners of homes within one- fourth mile of the pond site and any clusters of homes within one-half mile of the pond site. Federal Agencies: State Agencies: U.S. Fish and Wildlife Service MN Dept. of Natural Resources Twin Cities Field Office Division of Ecological and Water Resources 4101 American Boulevard East 500 Lafayette Road , Box 25 Bloomington, MN 55425-1665 St. Paul, MN 55155 4025 ATTN: Field Supervisor ATTN: Steve Colvin U.S.Army Corps of Engineers MN Historical Society St. Paul District State Historic Preservation Office 180 Fifth Street East, Suite 700 345 West Kellogg Boulevard St. Paul, MN 55101-1678 St. Paul, MN 55102-1906 ATTN: Randy Devendorf ATTN: Mary Ann Heidemann MVP-PD Federal Emergency Management Agency Region V Office 536 South Clark Street, 6th Floor Chicago, IL 60605 ATTN: Amanda Ratliff MPCA Regional Office(s): www.pca.state.mn.us 651-296-6300 800-657-3864 TTY 651-282-5332 or 800-657-3864 • Available in alternative formats wq-wwtp2-16 • 8117112 Page 3 of 3 Appendix F Signed Resolution Adopting Facility Plan CITY OF ELK RIVER, MINNESOTA RESOLUTION WHEREAS, The City Council of the City of Elk River recognizes the need to modernize and update its Wastewater Treatment methods and has identified future capacity problems of its existing Wastewater Treatment Facility, and WHEREAS,Bolton &Menk, Inc. has been retained as Consulting Engineers to prepare a Wastewater Treatment Facility Plan for the purpose of submitting such plan to the Minnesota Pollution Control Agency, and NOW THEREFORE, BE IT RESOLVED, By the City Council in and for the City of Elk River, Minnesota as follows: 1. The City Council does hereby adopt the proposed Elk River Wastewater Treatment Facility Plan as presented by Bolton &Menk, Inc. as Consulting Engineers. 2. That the appropriate City Officials are hereby authorized and directed to submit the City's Wastewater Treatment Facility Plan to the Minnesota Pollution Control Agency for review and approval. Said resolution was duly seconded by Council member and put to a vote. Voting in favor thereof were Council Members , and Mayor . Voting against said resolution- Motion carried. Approved this_day of March, 2013. John Dietz,Mayor ATTEST: Calvin Portner, City Administrator Appendix G Ordinances - CODE OF ORDINANCES Chapter 78- UTILITIES ARTICLE I. - IN GENERAL DIVISION 1. - PAYMENT AND ASSESSMENT OF COSTS TO CONNECT OR REPAIR PRIVATE UTILITY LINES DIVISION 1. -PAYMENT AND ASSESSMENT OF COSTS TO CONNECT OR REPAIR PRIVATE UTILITY LINESl851 Sec. 78-1 - Finding of public health and safety hazard. Sec. 78-2. - Petition authorized. Sec. 78-3. -Work to be completed by property owner. Sec. 78-4. - Payment and assessment of costs authorized. Sec. 78-5. - Sunset on payment and assessment for connections. Secs. 78-6-78-10. - Reserved. Sec. 78-1. - Finding of public health and safety hazard. (a) The city council finds that failure to connect to the city water system as required by section 78-21 of this Code, failure to connect to the city sewer and sewage disposal system as required by subsection 78-97(d) of this Code, and failure to maintain in good, operable condition private water and sanitary sewer utility lines, creates public health and safety hazards on private property which must be eliminated. (b) In addition to the provisions of section 78-22 and subsection 78-97(d), which authorize the city to make connections to the city water and sanitary sewer systems and to assess the costs therefore to the affected property, and the provisions of chapter 46, article II of this Code, which declares defective sewage systems and plumbing a nuisance affecting the public's safety and health and authorizes the city to abate such nuisances and to assess the costs therefor to the affected properties, the city council finds that it is necessary and in the public interest to provide a mechanism for costs incurred by private property owners to eliminate such public health and safety hazards on private property to be assessed against the property as a special assessment. (Ora. No. '12-06, § 1, 4-2-2012; Ora. ivo. 12-17, § 1, '12-10-2012) Sec. 78-2. - Petition authorized. Property owners who are required to connect to the city water and/or sanitary sewer system pursuant to section 78-21 and subsection 78-97(d) of this Code, or who have private water and/or sanitary sewer lines which have failed, and such failure has been determined by city land development staff to be a public health or safety hazard, may petition the city, on a form provided by the city, to pay the costs to connect (including any outstanding lateral/trunk assessments and applicable water and sewer connection charges) or repair the private utility lines and to assess amounts paid as a special charge under Minn. Stats. § 429.101. The city may accept or reject such petitions in its sole discretion, and may impose such conditions and requirements to acceptance as it deems appropriate. Oro. rvo. 12-06, § 1, 4-2-2012; Ord. No. 12-17, § 1, 12-10-2012) Elk River, Minnesota, Code of Ordinances Page 1 -CODE OF ORDINANCES Chapter 78- UTILITIES ARTICLE I. - IN GENERAL DIVISION 1. - PAYMENT AND ASSESSMENT OF COSTS TO CONNECT OR REPAIR PRIVATE UTILITY LINES Sec. 78-3. - Work to be completed by property owner. If a petition to pay and assess the costs of connection or repair is accepted by the city, installation of the required connections and/or repairs to private utility lines on private property shall be the responsibility of the property owner, shall be contracted for by the property owner, shall be completed by the property owner as required by the policies and ordinances of the City of Elk River and Elk River Municipal Utilities, and shall be inspected and accepted by the city building official before payment of costs is made. (Ord. No. 12-06, § 1, 4-2-2012; Ord. No. 12-17, § 1, 12-10-2012) Sec. 78-4. - Payment and assessment of costs authorized. (a) Upon completion and acceptance by the city of all work required, the city will make payment to the party or parties who performed the work in an amount not to exceed that set forth in the petition accepted by the city. Such payment by the city, and all other outstanding fees and charges required for connection to the public systems, shall constitute a special charge against the affected property pursuant to Minn. Stats. § 429.101 and shall be specially assessed against the property by the city pursuant to the provisions of Minn. Stats. § 429.101. Special assessments levied under this section shall be payable in a single installment, or by up to ten equal annual installments, as provided by the city council. (b) The city council shall establish, and may amend from time to time, policies regarding: (i) projects eligible for this program; (ii) petitions which may be accepted by the city administrator; (iii) petitions which may only be accepted by the city council; (iv) the number of annual installments over which amounts paid and assessed will be levied; and (v)the interest rate applicable to unpaid installments. (Ord. No. 12-06, § 1, 4-2-2012; Ord. No. 12-17, § 1, 12-10-2012) Sec. 78-5. - Sunset on payment and assessment for connections. Petitions to pay and assess the costs of connection to the city water system and the city sewer and sewage disposal system will not be accepted by the city for any connection project which is completed after December 31, 2015. (Ord. No. 12-17, § 1, 12-10-2012) Secs. 78-6-78-10. - Reserved. FOOTNOTE(S): (85)Editor's note—Ord. No. 12-17, § 1, adopted Dec. 10, 2012, changed the title of div. 1 from "Payment and Assessment of Costs to Repair Private Utility Lines"to "Payment and Assessment of Costs to Connect or Repair Private Utility Lines." Back Elk River, Minnesota, Code of Ordinances Page 2 -CODE OF ORDINANCES Chapter 78- UTILITIES ARTICLE III. -SEWERS AND SEWAGE DISPOSAL DIVISION 2. -SEWER USE AND DISCHARGE REQUIREMENTS DIVISION 2, -SEWER USEAND DISCHARGE REQUIREMENTS Subdivision I. - In General Subdivision ll. - Building Sewers and Connections Subdivision III. - Discharge Restrictions Elk River, Minnesota, Code of Ordinances Page 1 -CODE OF ORDINANCES Chapter 78- UTILITIES ARTICLE III. -SEWERS AND SEWAGE DISPOSAL DIVISION 2. -SEWER USE AND DISCHARGE REQUIREMENTS Subdivision I. - In General Subdivision I.- In General Sec. 78-91. - Definitions. Sec. 78-92. - Powers of enforcement officers. Sec. 78-93. - Liability for expense or damage caused by violation. Sec. 78-94. -Access to premises. Sec. 78-95. -Tests and sampling authorized. Sec. 78-96. - Methods for measurements, tests and analyses. Sec. 78-97. - Use of public sewers required. Sec. 78-98. - Repair of service connections. Sec. 78-99. - New connections prohibited unless sufficient capacity is available. Sec. 78-100. -Special agreements for acceptance of industrial waste. Sec. 78-101. - Private sewage disposal systems. Sec. 78-102. - Main and lateral sewer construction. Secs. 78-103-78-120. - Reserved. Sec. 78-91. - Definitions. The following words, terms and phrases, when used in this division, shall have the meanings ascribed to them in this section, except where the context clearly indicates a different meaning: Act means the Federal Water Pollution Control Act, also referred to as the Clean Water Act, as amended, 33 USC 1251 et seq. ASTM means the American Society for Testing Materials. BOD, denoting biochemical oxygen demand, means the quantity of oxygen utilized in the biochemical oxidation of organic matter, expressed in milligrams per liter, as determined in accordance with standard laboratory procedure as set forth in the latest edition of Standard Methods for the Examination of Water and Wastewater. Building drain means that part of the lower horizontal piping of a drainage system which receives the discharge from soil, waste and other drainage pipes inside the walls of the building and conveys it to the building sewer, beginning five feet (1.5 meters)outside the inner face of the building wall. Building sewer means the extension from the building drain to the public sewer or other place of disposal, also called the house connection. City includes the city council and its authorized representatives. COD, denoting chemical oxygen demand, means the quantity of oxygen utilized in the chemical oxidation of organic matter, expressed in milligrams per liter, as determined in accordance with standard laboratory procedures as set forth in the latest edition of Standard Methods for the Examination of Water and Wastewater. Elk River, Minnesota, Code of Ordinances Page 2 -CODE OF ORDINANCES Chapter 78- UTILITIES ARTICLE III. -SEWERS AND SEWAGE DISPOSAL DIVISION 2. -SEWER USE AND DISCHARGE REQUIREMENTS Subdivision I. - In General Compatible pollutant means biochemical oxygen demand, suspended solids, pH, and fecal coliform bacteria, plus additional pollutants identified in the NPDES/SDS permit if the treatment facilities are designed to treat such pollutants to a degree which complies with effluent concentration limits imposed by the permit. Control manhole means any manhole installed at an industry to facilitate observation, sampling and measurement of waste. Easement means an acquired legal right for the specific use of land owned by others. Fecal coliform means any number of organisms common to the intestinal tract of man and animals whose presence in sanitary sewers is an indicator of pollution. Floatable oil means any oil that has a density less than that of water which causes it to float on the sewage and which tends to coat surfaces and cause maintenance problems. Garbage means solid waste resulting from the domestic and commercial preparation, cooking and dispensing of food and from the handling, storage or sale of meat, fish, fowl, fruit, vegetables or condemned food. Incompatible pollutant means any pollutant that is not defined as a compatible pollutant, including nonbiodegradable dissolved solids. Industrial waste means gaseous, liquid and solid wastes resulting from industrial or manufacturing processes, trade or business or from the development, recovery and processing of natural resources, as distinct from residential or domestic strength wastes. Industry means any nongovernmental or nonresidential user of a publicly owned treatment works which is identified in the Standard Industrial Classification Manual, latest edition, which is categorized in divisions A, B, D, E and I. Infiltration means water entering a sewer system, including building drains and pipe, from the ground, through such means as, but not limited to, defective pipes, pipe joints, connections or manhole walls. Infiltration/inflow(0) means the total quantity of water from both infiltration and inflow. Inflow means water other than wastewater that enters a sewer system, including building drains, from such sources as, but not limited to roof leaders, cellar, yard and area drains, foundation drains, drains from springs and swampy areas, manhole covers, cross connections from storm sewers, catchbasins, surface runoff, street washwater or drainage. Interference means the inhibition or disruption of the city's wastewater disposal system processes or operations which causes or significantly contributes to a violation of any requirement of the city's NPDES and/or SIDS permit. The term includes sewage sludge use or disposal by the city in accordance with published regulations providing guidelines under section 405 of the Act or any regulations developed pursuant to the Solid Waste Disposal Act, the Clean Air Act, the Toxic Substances Control Act, or more stringent state criteria applicable to the method of disposal or use employed by the city. MPCA means the Minnesota Pollution Control Agency. National categorical pretreatment standards means federal regulations establishing pretreatment standards for introduction of pollutants in publicly owned wastewater treatment facilities which are determined to be not susceptible to treatment by such treatment facilities or would interfere with the operation of such treatment facilities, pursuant to section 307(b)of the Act. Elk River, Minnesota, Code of Ordinances Page 3 -CODE OF ORDINANCES Chapter 78- UTILITIES ARTICLE III. -SEWERS AND SEWAGE DISPOSAL DIVISION 2. -SEWER USE AND DISCHARGE REQUIREMENTS Subdivision I. - In General National Pollutant Discharge Elimination System permit (NPDES permit) means the system for issuing, conditioning and denying permits for discharge of pollutants from point sources into the navigable waters, the contiguous zone, and the oceans by the Administrator of the Environmental Protection Agency pursuant to sections 402 and 405 of the Federal Water Pollution Control Act Amendments of 1972. Natural outlet means any outlet into a watercourse, pond, ditch, lake or other body of surface water or groundwater. Noncontact cooling water means the water discharged from any use such as air conditioning, cooling or refrigeration, or during which the only pollutant added is heat. Normal domestic strength waste means wastewater that is primarily introduced by residential users with a BOD5 concentration not greater than 200 milligrams per liter, and a suspended solids concentration not greater than 250 milligrams per liter. Other wastes means garbage, municipal refuse, decayed wood, sawdust, shavings, bark, lime, sand, ashes, oil tar, chemicals, offal and other substances, except sewage and industrial wastes. pH is the logarithm of the reciprocal of the weight of hydrogen ions in grams per liter of solution. Plant operation means the utilities superintendent or a deputy, agent or representative thereof. Pretreatment means the treatment of wastewater from industrial sources prior to the introduction of the waste effluent into a publicly owned treatment works. Process water means any water used in the manufacturing, preparation or production of goods, material or food. Process water is an industrial waste. Properly shredded garbage means the wastes from the preparation, cooking and dispensing of food that have been shredded to such a degree that all particles will be carried freely under the flow conditions normally prevailing in public sewers, with no particle greater than one-half inch (1.27 cm) in any dimension. Sanitary waste means the liquid and water-carried waste discharged from sanitary plumbing facilities. Sewage and wastewater mean the water-carried waste products from residences, public buildings, institutions, industrial establishments or other buildings, including the excrementitious or other discharge from the bodies of human beings or animals, together with such groundwater infiltration and stormwater and surface water as may be present. Sewer means a pipe or conduit that carries wastewater or drainage water. Collection sewer means a sewer whose primary purpose is to collect wastewater from individual point source discharges and connections. Combined sewer means a sewer intended to serve as a sanitary sewer and a storm sewer. Force main means a pipe in which wastewater is carried under pressure. Interceptor sewer means a sewer whose primary purpose is to transport wastewater from collection sewers to a treatment facility. Private sewer means a sewer which is not owned and maintained by a public authority. It shall include the entire service line, including that beneath the public right-of-way, to the point of connection with the lateral or other public sewer line. Elk River, Minnesota, Code of Ordinances Page 4 -CODE OF ORDINANCES Chapter 78- UTILITIES ARTICLE III. -SEWERS AND SEWAGE DISPOSAL DIVISION 2. -SEWER USE AND DISCHARGE REQUIREMENTS Subdivision I. - In General Public sewer means a sewer owned, maintained and controlled by a public authority. Sanitary sewer means a sewer intended to carry only liquid and water-carried wastes from residences, commercial buildings, industrial plants and institutions together with minor quantities of groundwater, stormwater and surface water which are not admitted intentionally. Storm sewer and storm drain mean a drain or sewer intended to carry stormwater, surface runoff, groundwater, subsurface water, street washwater, drainage and unpolluted water from any source. Sewer system means pipelines or conduits, pumping stations, force mains and all other devices and appliances appurtenant thereto used for collecting or conducting sewage, industrial wastes or other waste to a point of ultimate disposal. Significant industrial user means any industrial user of the wastewater treatment facility: (1) Which has a discharge flow in excess of 25,000 gallons per average work day; (2) Which has exceeded five percent of the total flow received at the treatment facility; (3) Whose waste contains a toxic pollutant in toxic amounts pursuant to section 307(a) of the Act; or (4) Whose discharge has a significant effect, either singly or in combination with other contributing industries, on the wastewater disposal system, the quality of sludge, the system's effluent quality or emissions generated by the treatment system. Slug means any discharge of water or wastewater which in concentration of any given constituent, or in quantity of flow, exceeds, for any period of duration longer than 15 minutes, more than five times the average 24-hour concentration of flows during normal operations and which adversely affect the collection system and/or performance of the wastewater treatment works. State disposal system (SDS) permit means any permit, including any terms, conditions and requirements thereof, issued by the MPCA pursuant to Minn. Stats. § 115.07 for a disposal system as defined by Minn. Stats. § 115.01, subd. 8. Storm drain and storm sewer mean a sewer which carries stormwater and surface water and drainage but excludes sewage and industrial wastes, other than unpolluted cooling or process water. Suspended solids means solids that either float on the surface of, or are in suspension in, water, sewage, or other liquids and which are removable by laboratory filtering, in accordance with the latest edition of Standard Methods for the Examination of Water and Wastewater. Toxic pollutant means the concentration of any pollutant or combination of pollutants which upon exposure to or assimilation into any organism will cause adverse effects as defined in standards issued pursuant to section 307(a)of the Act. Unpolluted water means clean water uncontaminated by industrial waste or other wastes or any substance which renders such water unclean or noxious or unpure so as to be actually or potentially harmful, detrimental or injurious to public health, safety or welfare, to domestic, commercial, industrial or recreational use, or to livestock, wild animals, birds, fish or other aquatic life. User means any person who discharges or causes or permits the discharge of wastewater into the city's wastewater disposal system. Wastewater facilities means the structures, equipment and processes required to collect, carry away and treat domestic and industrial wastes and dispose of the effluent. Elk River, Minnesota, Code of Ordinances Page 5 -CODE OF ORDINANCES Chapter 78- UTILITIES ARTICLE III. -SEWERS AND SEWAGE DISPOSAL DIVISION 2. -SEWER USE AND DISCHARGE REQUIREMENTS Subdivision I. - In General Wastewater treatment works and treatment works mean an arrangement of devices and structures for treatment of wastewater, industrial wastes and sludge. Such terms are sometimes used synonymously in this division for the term "waste treatment plant," "wastewater treatment plant," "water pollution control plant"or"sewage treatment plant." Watercourse means a natural or artificial channel for the passage of water, either continuously or intermittently. WPCF means the Water Pollution Control Federation. (Code 1982, § 1300.00) Cross reference—Definitions generally, § 1-2. Sec. 78-92. - Powers of enforcement officers. (a) The city shall be permitted to gain access to such properties as may be necessary for the purpose of inspection, maintenance and repair, observation, measurement, sampling and testing, in accordance with provisions of this division. Any person found to be violating any provision of this division shall be served by the city with written notice stating the nature of the violation and providing a reasonable time limit for the satisfactory correction thereof. Any person who shall continue any violation beyond the time limit shall be guilty of violation of the service contract and shall be temporarily disconnected from the sanitary sewer and/or water service. Such disconnection and reconnection would be at the total expense of the customer. (b) Where acids and chemicals damaging to sewer lines or treatment processes are released to the sewer causing rapid deterioration of these structures or interfering with proper treatment of sewage, the city is authorized to immediately terminate service by such measures as are necessary to protect the facilities. (c) Any additional costs caused by discharges to the treatment works of toxins or other incompatible wastes, including the costs of restoring wastewater treatment services, cleanup and restoration of the receiving waters and environs and sludge disposal, shall be borne by the discharger of such wastes, at no expense to the city. (d) As a condition of use, the city shall be granted access by industrial users to information regarding industrial processes which have a direct bearing on the type and source of discharges to the wastewater collection system. (e) All work performed on private property by the city in the course of operating and maintaining the city's sewer utility shall be performed in full accordance with a duly negotiated and executed easement. (f) The city and its authorized employees shall observe all applicable safety rules while performing work on private property and the city shall hold the owner blameless for injury or death except as such may be caused by negligence or failure of the owner to maintain safe conditions. (Code 1982, § 1302.28(1), (2), (4)—(7)) Elk River, Minnesota, Code of Ordinances Page 6 -CODE OF ORDINANCES Chapter 78- UTILITIES ARTICLE III. -SEWERS AND SEWAGE DISPOSAL DIVISION 2. -SEWER USE AND DISCHARGE REQUIREMENTS Subdivision I. - In General Sec. 78-93. - Liability for expense or damage caused by violation. In addition to other penalties imposed for violation of this article, any person violating any of the provisions of this division shall become liable to the city for any expense, loss or damage occasioned by the city by reason of such violations. (Code 1982, § 1300.14(4)) Sec. 78-94. -Access to premises. (a) Duly authorized employees of the city bearing proper credentials and identification shall, at reasonable times, be permitted to enter upon all properties for the purpose of inspection, observation, measurement, sampling and testing in accordance with the provisions of this division. Such employees shall not have authority to inquire into any industrial processes, including but not limited to metallurgical, chemical, oil, refining, ceramic, or paper operations, except as is necessary to determine the type and source of the discharge to the public sewer. While performing such necessary work on such properties, the city employees shall observe all safety rules applicable to the premises. (b) Duly authorized employees of the city bearing proper credentials and identification shall, at reasonable times, be permitted to enter upon all properties through which the city holds an easement for the purpose of, but not limited to, inspection, observation and construction of public sewers. (c) The duly authorized representatives or other duly authorized employees of the city, bearing proper credentials and identification, shall be permitted to enter all properties for the purpose of inspection, observation, measurement, sampling and testing pertinent to the discharges to the city's sewer system in accordance with the provisions of this division. (d) The duly authorized representatives or other duly authorized employees are authorized to obtain information concerning industrial processes which have a direct bearing on the type and source of discharge to the wastewater collection system. An industry may withhold information considered confidential; however, the industry must establish that the revelation to the public of the information in question might result in an advantage to competitors. (e) While performing necessary work on private properties, the duly authorized representatives or duly authorized employees of the city shall observe all safety rules applicable to the premises established by the company, and the company shall be held harmless for injury or death to the city employees, and the city shall indemnify the company against loss or damage to its property by city employees and against liability claims and demands for personal injury or property damage asserted against the company and growing out of the gauging and sampling operation, except as such may be caused by negligence or failure of the company to maintain safe conditions as required in this division. (f) The duly authorized representatives or other duly authorized employees of the city bearing proper credentials and identification shall be permitted to enter all private properties through which the city holds an easement for the purposes of, but not limited to, inspection, observation, measurement, sampling, repair and maintenance of any portion of the wastewater facilities lying within the easement. All entry and subsequent work, if any, on the easement, shall be done in full accordance with the terms of the easement pertaining to the private property involved. In addition to other penalties for refusal to permit inspections under this section, all subsequent sewer bills shall be charged at triple the regular rate until inspection is freely permitted by the refusing service recipient. (Code 1982, § 1300.12) Elk River, Minnesota, Code of Ordinances Page 7 - CODE OF ORDINANCES Chapter 78- UTILITIES ARTICLE III. -SEWERS AND SEWAGE DISPOSAL DIVISION 2. -SEWER USE AND DISCHARGE REQUIREMENTS Subdivision I. - In General Sec. 78-95. - Tests and sampling authorized. The city may conduct such tests as are necessary to enforce this division, and employees of the city may enter upon any property for the purpose of taking samples, obtaining information, or conducting surveys or investigations relating to such enforcement. Entry shall be made during operating hours unless circumstances require otherwise. In all cases where tests are conducted by the city for the purpose of determining if a previously found violation of this division has been corrected, the cost of such tests shall be charged to the user and added to the user's sewer charge. In those cases where the city determines that the nature or volume of a particular user's sewage requires more testing than normally required, the city may charge the user for such additional test after giving the user ten days' written notice of its intention to do so, and the cost thereof shall be added to the user's charge. (Code 1982, § 1300.02(15)) Sec. 78-96. - Methods for measurements, tests and analyses. All measurements, tests, and analysis of the characteristics of waters and wastes to which reference is made in this division shall be determined in accordance with the latest edition of Standard Methods for the Examination of Water and Wastewater, published by the American Public Health Association, the American Water Works Association, and the Water Environment Federation. Sampling methods, locations, times, duration and frequencies are to be determined on an individual basis subject to approval by the city. (Code 1982, § 1300.02(16)) Sec. 78-97. - Use of public sewers required. (a) It shall be unlawful for any person to place, deposit, or permit to be deposited in any unsanitary manner on public or private property within the city, or in any area under the jurisdiction of the city, any human or animal excrement, garbage or other objectionable waste. Generally accepted gardening and agricultural practices are not prohibited by this subsection. (b) It shall be unlawful to discharge to any natural outlet within the city, or in any area under the jurisdiction of the city, any sewage or other polluted waters, except where suitable treatment has been provided in accordance with the provisions of this division. (c) Except as provided in this division, it shall be unlawful to construct or maintain any privy, privy vault, septic tank, cesspool or other facility intended or used for the disposal of sewage. (d) All buildings constructed on property to which a public sewer is available at the time a certificate of occupancy is issued for the building shall be required to connect to the public sewer prior to occupancy. All buildings to which a public sewer becomes available following legal occupancy of the building shall be required to connect to the public sewer, provided that the public sewer is within 300 feet of the structure generating wastewater and the public sewer is located in a public right-of-way or easement for utility purposes adjacent to the property, as follows: (1) Connection shall be required if either the septic system or well serving the building or property fails and needs replacement; and (2) Connection shall be required prior to the sale of the building or the property on which the building sits. Elk River, Minnesota, Code of Ordinances Page 8 -CODE OF ORDINANCES Chapter 78- UTILITIES ARTICLE III. -SEWERS AND SEWAGE DISPOSAL DIVISION 2. -SEWER USE AND DISCHARGE REQUIREMENTS Subdivision I. - In General (e) If sewer connections are not made pursuant to subsection (d) above, the city shall serve written notice on the affected property owner stating that if the connection is not made within 90 days after the date of such notice, the connection will be made by the city at the expense of the owner and that, if unpaid, the charge for such work will be made a special assessment against the property concerned. Such assessment, when levied, shall be a lien against the property and shall bear interest at the legal rate for local improvements and shall be certified to the county auditor and collected and remitted to the city in the same manner as assessments for local improvements. The rights of the city under this subsection shall be in addition to other remedial or enforcement rights provided under this division. (Code 1982, § 1300.02(1)—(4); Ord. No. 12-18, § 2, 12-10-2012) State law reference—Authority to require sewer connections, Minn. Stats. § 412.221, subd. 31. Sec. 78-98. - Repair of service connections. Whenever any service connection becomes clogged, obstructed, broken or out of order, or detrimental to the use of the public sewer, or unfit for the purpose of drainage, the owner shall repair the connection or cause such work to be done as the city may direct. Each day after 15 days that a person neglects or fails to so act shall constitute a separate violation of this section, and the city may then cause the work to be done and recover from such owner or agent the expense thereof by an action in the name of the city. (Code 1982, § 1300.02(19)) Sec. 78-99. - New connections prohibited unless sufficient capacity is available. New connections to the public sanitary sewer system shall be prohibited unless sufficient capacity is available in all downstream facilities, including capacity for flow, BOD and suspended solids. (Code 1982, § 1300.02(21)) Sec. 78-100. - Special agreements for acceptance of industrial waste. Nothing in this division shall be construed so as to prevent any special agreement or arrangement between the city and any industrial concern whereby an industrial waste of unusual strength or character may be accepted by the city for treatment, subject to payment therefor by the industrial concern, in accordance with applicable ordinances and any supplemental agreement with the city, providing that national categorical pretreatment standards and/or state disposal system permit limitations are not violated. (Code 1982, § 1300.02(23)) Sec. 78-101. - Private sewage disposal systems. (a) Generally. Where a public sanitary or combined sewer is not available under the provisions of this division, the building sewer shall be connected to a private sewage disposal system which complies with the provisions of the Minnesota Pollution Control Agency Individual Sewage Treatment Standards, chapter 7080 et seq. (referred to in this section as "chapter 7080"), as amended from Elk River, Minnesota, Code of Ordinances Page 9 -CODE OF ORDINANCES Chapter 78- UTILITIES ARTICLE III. -SEWERS AND SEWAGE DISPOSAL DIVISION 2. -SEWER USE AND DISCHARGE REQUIREMENTS Subdivision I. - In General time to time, which standards are hereby adopted by reference and made a part of this division as fully as though set forth in full in this section. A copy of such standards is filed with the city administrator. In addition thereto, the following appendix to chapter 7080 is hereby adopted by reference and made a part of this division as fully as though set forth in full, a copy being on file with the city administrator: Appendix A, Alternative Systems. Alternatively, in the sole discretion of the city and based upon relevant factors including, but not limited to, soil type, topography and proximity to water bodies, a private sewage disposal system shall comply with the following minimum requirements and standards: i. Six hundred square feet of drainfield plus a 1,200-gallon tank; or ii. Two hundred linear feet of trenching equivalent to 600 square feet, at least two trenches, plus a 1,200-gallon tank. (b) Permit. Prior to commencement of construction of a private wastewater disposal system, the owner shall first obtain a written permit signed by the building and zoning administrator. The application for such permit shall be made on a form furnished by the city which the applicant shall supplement by any plans, specifications, and other information as are deemed necessary by the city. (c) Inspection. Operation of a private wastewater disposal system shall not be allowed until the installation is completed to the satisfaction of the city or its authorized representative. The city or its representative shall be allowed to inspect the work at any stage of construction and, in any event, the applicant for the permit shall notify the city when work is ready for final inspection, and before any underground portions are covered. The inspection shall be made within 48 hours of receipt of notice, if reasonably practicable. (d) Discontinuance of use and connection to public sewer. At such time as a public sewer becomes available to a property serviced by a private wastewater disposal system, a direct connection shall be made to the public sewer within 120 days in compliance with this division, and within seven days any septic tanks, cesspools and similar private wastewater disposal systems shall be cleaned of sludge. The bottom shall be broken to permit drainage, and the tank or pit filled with suitable materials. (e) Maintenance. The owner shall operate and maintain the private wastewater disposal facilities in a sanitary manner at all times at no expense to the city. (f) State requirements. No statement contained in this section shall be construed to interfere with any additional requirements that may be imposed by the MPCA or the state department of health. (Code 1982, § 1300.04) Sec. 78-102. - Main and lateral sewer construction. (a) No main or lateral sewer shall be constructed in the city except by city employees or by other authorized personnel in accordance with plans and specifications approved by the city engineer. Main and lateral sewers must be accepted by the city prior to inclusion in the public sewer system. (b) The size, slope, alignment, materials of construction, methods to be used in excavation, placement of pipe, jointing, testing, filling, and other work related to the construction of main and lateral sewers shall conform to the requirements of the city. (Code 1982, § 1300.08) Elk River, Minnesota, Code of Ordinances Page 10 -CODE OF ORDINANCES Chapter 78- UTILITIES ARTICLE III. -SEWERS AND SEWAGE DISPOSAL DIVISION 2. -SEWER USE AND DISCHARGE REQUIREMENTS Subdivision I. - In General Secs. 78-103-78-120. - Reserved. Elk River, Minnesota, Code of Ordinances Page 11 -CODE OF ORDINANCES Chapter 78- UTILITIES ARTICLE III. -SEWERS AND SEWAGE DISPOSAL DIVISION 2. -SEWER USE AND DISCHARGE REQUIREMENTS Subdivision II. - Building Sewers and Connections Subdivision II. - Building Sewers and Connections Sec. 78-121. - Permit. Sec. 78-122. - Payment of costs; indemnification of city. Sec. 78-123. -Separate building sewer required for each building; exceptions. Sec. 78-124. - Use of old building sewers. Sec. 78-125. - Filling of unused septic tanks and similar devices. Sec. 78-126. - Materials and procedures for installation of building sewer. Sec. 78-127. - Elevation of building sewer. Sec. 78-128. - Drainage of runoff or groundwater to sanitary sewer. Sec. 78-129. -Construction specifications. Sec. 78-130. - Excavations. Sec. 78-131. - Inspection of building sewer; supervision of connection. Sec. 78-132. -Compliance with conditions of service. Sec. 78-133. - Bond for persons installing connections. Secs. 78-134-78-150. - Reserved. Sec. 78-121. - Permit. (a) Required. No unauthorized person shall uncover, make any connection with or opening into, use, alter, or disturb any public sewer or appurtenance thereof without first obtaining a written permit from the city. (b) Application. Applications for permits shall be made by the owner or his authorized agent and the party employed to do the work, and shall state the location, the name of the owner, the street number of the building to be connected, and how the building is occupied. No person shall extend any private building drain beyond the limits of the building or property for which the service connection permit has been given. (c) Classes;supplemental information. There shall be two classes of building sewer permits: (1) For residential and for commercial service; and (2) For service to establishments producing industrial wastes. In either case, the application shall be supplemented by any plans, specifications, or other information considered pertinent in the judgment of the city. The industry, as a condition of permit authorization, must provide information describing its wastewater constituents, characteristics, and type of activity. (d) Suspension or revocation. The council may suspend or revoke any permit issued under this section and may take such other action as it may deem reasonable in order to facilitate compliance for any of the following causes: Elk River, Minnesota, Code of Ordinances Page 12 -CODE OF ORDINANCES Chapter 78- UTILITIES ARTICLE III. -SEWERS AND SEWAGE DISPOSAL DIVISION 2. -SEWER USE AND DISCHARGE REQUIREMENTS Subdivision II. - Building Sewers and Connections (1) Giving false information in connection with the application for a permit. (2) Incompetence of the permit holder. (3) Willful violation of any provisions of this division or any rule or regulation pertaining to the mixing of service connections. (Code 1982, § 1300.06(1)—(3), (16)) Sec. 78-122. - Payment of costs; indemnification of city. All costs and expenses incident to the installation and connection of the building sewer shall be borne wholly by the property owner. The owner shall indemnify and hold harmless the city from any loss or damage to the public sewer that may directly or indirectly be occasioned by the installation of the building sewer. After the initial connection to the main service stub, the property owner shall thereafter be liable for all maintenance and repairs to his sanitary sewer service line between the street main and the building being served. (Code 1982, § 1300.06(4)) Sec. 78-123. - Separate building sewer required for each building; exceptions. A separate and independent building sewer shall be provided for every building, except that where two or more buildings are situated on one parcel such that the parcel may not be subdivided, a single private sewer may be extended to the rear buildings and the whole considered as one joint use private sewer. Special variances will be considered by the city council. (Code 1982, § 1300.06(5)) Sec. 78-124. - Use of old building sewers. Old building sewers may be used in connection with new buildings only when they are found, on examination and test by a duly authorized city inspector, to meet all requirements of this division. (Code 1982, § 1300.06(6)) Sec. 78-125. - Filling of unused septic tanks and similar devices. Unused septic tanks, cesspools, leaching pits and similar devices and structures shall be backfilled or made safe and unusable in a manner acceptable to the city. (Code 1982, § 1300.06(7)) Sec. 78-126. - Materials and procedures for installation of building sewer. The size, slope, alignment, and materials of construction of a building sewer, and the method to be used in excavating, placing of pipe, jointing, testing and backfilling the trench, shall conform to the requirements of this Code and all other applicable rules and regulations. In the absence of Code provisions or in amplification thereof, materials and procedures set forth in appropriate specifications of Elk River, Minnesota, Code of Ordinances Page 13 -CODE OF ORDINANCES Chapter 78- UTILITIES ARTICLE III. -SEWERS AND SEWAGE DISPOSAL DIVISION 2. -SEWER USE AND DISCHARGE REQUIREMENTS Subdivision II. - Building Sewers and Connections Water Pollution Control Federation Manual of Practice No. 9 and applicable American Society for Testing Materials standards shall apply. (Code 1982, § 1300.06(8)) Sec. 78-127. - Elevation of building sewer. Whenever possible, the building sewer shall be brought to the building at an elevation below the basement floor. In all buildings in which any building drain is too low to permit gravity flow to the public sewer, such building drain shall be provided with an approved lifting device for discharge to the building sewer. (Code 1982, § 1300.06(9)) Sec. 78-128. - Drainage of runoff or groundwater to sanitary sewer. No person shall make connections of roof downspouts, exterior foundation drains, areaway drains or other source of surface runoff or groundwater to a building sewer or building drain which in turn is connected directly or indirectly to a public sanitary sewer. (Code 1982, § 1300.06(10)) Sec. 78-129. - Construction specifications. The construction of the building sewer and its connection to the public sewer shall conform to the requirements of this Code, the sewer specifications included in this division, all other applicable rules and regulations, and the procedures set forth in appropriate specifications of the Water Pollution Control Federation Manual of Practice No. 9 and the American Society for Testing Materials. All such construction shall be made gastight and watertight. Any deviation from the prescribed procedures and materials must be approved by the city prior to installation. (Code 1982, § 1300.06(11)) Sec. 78-130. - Excavations. All excavations for building sewer installations shall be adequately guarded with barricades and lights so as to protect the public from hazards. Streets, sidewalks, parkways and other public property disturbed in the course of the work shall be restored in a manner satisfactory to the city. (Code 1982, § 1300.06(12)) Sec. 78-131. - Inspection of building sewer; supervision of connection. The applicant for a building sewer permit shall notify the city when the building sewer is ready for inspection and connection to the public sewer. The connection and inspection shall be made under the supervision of the city or an authorized representative thereof. (Code 1982, § 1300.06(13)) Elk River, Minnesota, Code of Ordinances Page 14 -CODE OF ORDINANCES Chapter 78- UTILITIES ARTICLE III. -SEWERS AND SEWAGE DISPOSAL DIVISION 2. -SEWER USE AND DISCHARGE REQUIREMENTS Subdivision II. - Building Sewers and Connections Sec. 78-132. - Compliance with conditions of service. Any person desiring to make a service connection to the public sewer shall comply with the conditions set forth by the city. (Code 1982, § 1300.06(14)) Sec. 78-133. - Bond for persons installing connections. No person shall make a service connection to the public sewer until a bond to the city is filed with the building department conditioned that the person will indemnify and hold harmless the city from all suits, accidents, and damage that may arise by reason of any opening in any street, alley or public ground made by the person or by those in the person's employment for any purpose whatsoever, and that the person will replace and restore the street and alley over such opening to the condition existing prior to installation, adequately guard the opening with barricades and lights, and keep and maintain the opening to the satisfaction of the city or its authorized representative, and shall conform in all respects to the rules and regulations of the city relative thereto, and pay all fines that may be imposed on the person by law. (Code 1982, § 1300.06(15)) Secs. 78-134^78-150. - Reserved. Elk River, Minnesota, Code of Ordinances Page 15 -CODE OF ORDINANCES Chapter 78- UTILITIES ARTICLE III. -SEWERS AND SEWAGE DISPOSAL DIVISION 2. -SEWER USE AND DISCHARGE REQUIREMENTS Subdivision III. - Discharge Restrictions Subdivision III. - Discharge Restrictions Sec. 78-151. -Assessment of costs of repair resultinq from discharge of prohibited wastes. Sec. 78-152. - Discharge of unpolluted water. Sec. 78-153. - Prohibited discharges. Sec. 78-154. - Restricted discharges. Sec. 78-155. -Acceptance of restricted wastes. Sec. 78-156. -Grease, oil and sand interceptors. Sec. 78-157. - Preliminary treatment or flow-equalizing facilities. Sec. 78-158. - Dilution of discharge. Sec. 78-159. -Control manhole. Sec. 78-160. -Sampling and analysis of waste. Sec. 78-161. -Accidental discharges. Sec. 78-162. -Catchbasins and waste traps. Sec. 78-163. - Motor vehicle washing or servicing facilities. Secs. 78-164-78-180. - Reserved. Sec. 78-151. -Assessment of costs of repair resulting from discharge of prohibited wastes. In addition to any penalties that may be imposed for violation of any provision of this division, the city may assess against any person the cost of repairing or restoring sewers or associated facilities damaged as a result of the discharge of prohibited wastes by such person, and may collect such assessment as an additional charge for the use of the public sewer system or in any other manner deemed appropriate by the city. (Code 1982, § 1300.02(22)) Sec. 78-152. - Discharge of unpolluted water. (a) No person shall discharge or cause to be discharged, directly or indirectly, any stormwater, surface water, groundwater, roof runoff, subsurface drainage, waste from individual sewage treatment systems, or unpolluted cooling or process water to any sanitary sewer except as permitted by the city. (b) Stormwater and all other unpolluted water shall be discharged to a storm sewer, except that unpolluted cooling or process water shall only be so discharged upon approval by the city and the issuance of a discharge permit by the MPCA. (Code 1982, § 1300.02(5), (6)) Elk River, Minnesota, Code of Ordinances Page 16 -CODE OF ORDINANCES Chapter 78- UTILITIES ARTICLE III. -SEWERS AND SEWAGE DISPOSAL DIVISION 2. -SEWER USE AND DISCHARGE REQUIREMENTS Subdivision III. - Discharge Restrictions Sec. 78-153. - Prohibited discharges. No person shall discharge or cause to be discharged, directly or indirectly, any of the following described substances to any public sewer: (1) Any liquids, solids, or gases which by reason of their nature or quantity are, or may be, sufficient either alone or by interaction with other substances to cause fire or explosion or be injurious in any other way to the wastewater disposal system or to the operation of the system. Prohibited materials include, but are not limited to, gasoline, kerosene, naphtha, benzene, toluene, xylene, ethers, alcohols, ketones, aldehydes, peroxides, chlorates, perchlorates, bromates, carbides, hydrides and sulfides. (2) Any water or wastes containing toxic or poisonous solids, liquids or gases in sufficient quantity, either singly or by interaction with other wastes, to injure or interfere with any sewage treatment process, to constitute a hazard to humans or animals, to create a public nuisance, or to create any hazard in a wastewater treatment works. A toxic pollutant shall include, but not be limited to, any pollutant identified pursuant to section 307(a)of the Act. (3) Any water or wastes having a pH lower than 5.5 or having any other corrosive property capable of causing damage or hazard to structures, equipment and personnel or the wastewater treatment works. (4) Solid or viscous substances, either whole or ground, in quantities or of such size to be capable of causing obstruction to the flow in sewers or other interference with the proper operation of the wastewater treatment works, including, but not limited to, ashes, cinders, disposal diapers, glass grinding or polishing wastes, stone cutting or polishing wastes, sand, mud, straw, shavings, metal, glass, rags, feathers, tar, plastics, wood, underground garbage, whole blood, paunch manure, hair and fleshings, entrails, and sanitary napkins, paper dishes, cups, milk containers and other paper products. Solids shall have a maximum allowable diameter of three inches. (5) Noxious or malodorous liquids, gases or substances which either singly or by interaction with other wastes are sufficient to create a public hazard to life or are sufficient to prevent entry into the sewers for their maintenance and repair. (Code 1982, § 1300.02(7)) Sec. 78-154. - Restricted discharges. No person shall discharge or cause to be discharged, directly or indirectly, the following described substances to any public sewer, unless, in the opinion of the city, such discharge will not harm the wastewater treatment works or cause obstruction to the flow in sewers or otherwise endanger life, limb or public property or constitute a nuisance. In forming its opinion as to the acceptability of these wastes, the city may give consideration to such factors as the quantities of the subject wastes in relation to flows and velocities in the sewers, the nature of construction of the sewers, the nature of the sewage treatment process, the capacity of the sewage treatment plant, the degree of treatability of wastes in the sewage treatment plant, the city's NPDES permit, and other pertinent factors. The city may make such determination on a general basis or as to the discharges from individual users or specific discharges, and may prohibit certain discharges from individual users because of unusual concentrations or combinations which may occur. The substances prohibited are: Elk River, Minnesota, Code of Ordinances Page 17 -CODE OF ORDINANCES Chapter 78- UTILITIES ARTICLE III. -SEWERS AND SEWAGE DISPOSAL DIVISION 2. -SEWER USE AND DISCHARGE REQUIREMENTS Subdivision III. - Discharge Restrictions (1) Any wastewater having a temperature higher than 150 degrees Fahrenheit (65 degrees Celsius), or causing individually, or in combination with other wastewater, the influent at the wastewater treatment plant to have a temperature exceeding 104 degrees Fahrenheit (40 degrees Celsius), or having heat in amounts which will inhibit biological activity in the wastewater treatment works resulting in interference therein. (2) Any water or waste containing fats, wax, grease or oils, whether emulsified or not, in excess of 100 milligrams per liter, or containing substances which may solidify or become viscous at temperatures between 32 and 150 degrees Fahrenheit (zero degrees and 65 degrees Celsius, respectively), and any wastewater containing oil and grease concentrations of mineral origin of greater than 100 milligrams per liter, whether emulsified or not. (3) Any garbage that has not been ground or otherwise reduced to such a degree that all particles will be carried freely in suspension under flow conditions normally prevailing in public sewers, with no particles greater than one-half inch in any dimension. (4) Any water or waste containing strong acid iron pickling wastes, or concentrated plating solutions, which is not neutralized and does not meet applicable pretreatment standards. If national categorical pretreatment standards do not apply, the discharge equality shall comply with 40 CFR part 433 (metal finishing standards). (5) Any noxious water or wastes containing phenols or other taste- or odor-producing substances which constitute a nuisance or hazard to the structures, equipment or personnel of the waste treatment works, or which interfere with treatment required to meet the requirements of the state and federal government and any other public agency with proper authority to regulate discharge from the sewage treatment plant. (6) Radioactive wastes or isotopes of such halflife or concentration that they are in noncompliance with regulations issued by the appropriate authority having control over their use or which have caused or may have caused damage or hazard to the treatment works or personnel operating it. (7) Any water or waste outside the pH range of 5.0 to 10.5. This range will allow adequate flexibility for industrial users. A higher pH than 8.5 but less than 10.5 will not cause treatment or sewer compatibility problems and in many cases will allow industrial users to better treat wastewater containing metals prior to discharge. Potable water supplies often exceed a pH of 8.5. (8) Any noncontact cooling water or unpolluted stormwater, drainage water or groundwater. (9) Any waters or wastes containing the following substances: arsenic, cadmium, copper, cyanide, lead, mercury, nickel, silver, total chromium, zinc or phenolic compounds, to a degree that the materials received prevent adequate treatment of the waste. (10) Materials which exert or cause: a. Unusual concentrations of suspended solids, such as, but not limited to, Fuller's earth, lime slurry and lime residues, or of dissolved solids, such as, but not limited to, sodium chloride and sodium sulfate. b. Excessive discoloration, such as, but not limited to, dye wastes and vegetable tanning solutions. c. Unusual BOD, COD or chlorine requirements in such quantities as to constitute a significant load on the wastewater treatment works. d. Unusual volumes of flow or concentrations of wastes constituting a slug. Elk River, Minnesota, Code of Ordinances Page 18 -CODE OF ORDINANCES Chapter 78- UTILITIES ARTICLE III. -SEWERS AND SEWAGE DISPOSAL DIVISION 2. -SEWER USE AND DISCHARGE REQUIREMENTS Subdivision III. - Discharge Restrictions (11) Water or wastes containing substances which are not amenable to treatment or reduction by the sewage treatment process employees, or are amenable to treatment only to such a degree that the sewage treatment plant effluent cannot meet the requirements of the NPDES permit or requirements of other governmental agencies having jurisdiction over discharge from the sewage treatment plant. (Code 1982, § 1300.02(8)) Sec. 78-155. -Acceptance of restricted wastes. (a) If any water or wastes are discharged, or are proposed to be discharged, directly or indirectly, to the public sewers, which water or wastes do not meet the standards set forth in or promulgated under this subdivision, or which, in the judgment of the city, may have a deleterious effect upon the wastewater treatment works, processes, or equipment or receiving waters, or which otherwise create a hazard to life or constitute a public nuisance, the city may take any or all of the following steps: (1) Refuse to accept the discharges; (2) Require control over the quantities and rates of discharge; (3) Require pretreatment to an acceptable condition for the discharge to the public sewers, pursuant to section 307(b)of the Act and all addendums thereto; or (4) Require payment to cover the adequate cost of handling, treating and disposing of the wastes not covered by existing taxes or sewer service charges. (b) If the city permits the pretreatment or equalization of waste flows, the design and installation of the plant and equipment shall be made at the owner's expense, and shall be subject to the review and approval of the city pursuant to the requirements of the MPCA. (Code 1982, § 1300.02(9)) Sec. 78-156. - Grease, oil and sand interceptors. Grease, oil and sand interceptors or equalization tanks shall be provided and installed by the owner when, in the opinion of the city, they are necessary for the proper handling of liquid wastes containing floatable grease in excessive amounts as specified in section 78-154(2), any flammable wastes, as specified in section 78-153(1), sand, or other harmful ingredients; except that such interceptors shall not be required for private living quarters or dwelling units. All interceptors shall be of the type to be readily and easily accessible for cleaning and inspection. In the maintaining of these interceptors, the owner shall be responsible for the proper removal and disposal of the captured materials by appropriate means, and shall maintain a record of dates and means of disposal, which are subject to review by the city. Any removal and hauling of the collected materials not performed by the owner's personnel must be performed by a currently licensed waste disposal firm. (Code 1982, § 1300.02(10)) Sec. 78-157. - Preliminary treatment or flow-equalizing facilities. Where preliminary treatment facilities, flow-equalizing facilities or interceptors are provided for any water or wastes, they shall be effectively operated and maintained continuously in satisfactory and Elk River, Minnesota, Code of Ordinances Page 19 - CODE OF ORDINANCES Chapter 78- UTILITIES ARTICLE III. -SEWERS AND SEWAGE DISPOSAL DIVISION 2. -SEWER USE AND DISCHARGE REQUIREMENTS Subdivision III. - Discharge Restrictions effective condition by the owner at such owner's expense, and shall be available for inspection by the city at all reasonable times. (Code 1982, § 1300.02(11)) Sec. 78-158. - Dilution of discharge. No user shall increase the use of process water or in any manner attempt to dilute a discharge as a partial or complete substitute for adequate treatment to achieve compliance with the limitations contained in sections 78-153 and 78-154, or contained in the national categorical pretreatment standards or any state requirements. (Code 1982, § 1300.02(12)) Sec. 78-159. - Control manhole. All industrial building and other buildings, as required by the city, that are serviced by a sewer carrying industrial waste shall install a suitable control structure, together with necessary meters and other appurtenances in the building sewer, to facilitate observation, sampling, and measurement of the wastes. Such structure and equipment when required shall be constructed at the owner's expense in accordance with plans approved by the city and shall be maintained by the owner so as to be safe and accessible to reasonable city inspection. (Code 1982, § 1300.02(13)) Sec. 78-160. - Sampling and analysis of waste. The owner of any property serviced by a building sewer carrying industrial wastes shall, at the discretion of the city, be required to provide laboratory measurements, tests and analyses of waters and wastes to illustrate compliance with this division and any special conditions for discharge established by the city or regulatory agencies having jurisdiction over the discharge. The number, type and frequency of sampling and laboratory analysis to be performed by the owner shall be as stipulated by the city. The industry must supply a complete analysis of the constituents of the wastewater discharge to ensure that compliance with the federal, state and local standards are being met. The owner shall report the results of measurements and laboratory analysis to the city at such times and in such manner as prescribed by the city. The owner shall bear the expense of all measurements, analysis and reporting required by the city. At such time as deemed necessary, the city reserves the right to take measurements and samples for analysis by an independent laboratory and charge the owner for such services. (Code 1982, § 1300.02(14)) Sec. 78-161. - Accidental discharges. Where required by the city, the owner of any property serviced by a sanitary sewer shall provide protection from an accidental discharge of prohibited materials or other substances regulated by this division. Where necessary, facilities to prevent accidental discharges of prohibited materials shall be provided and maintained at the owner's expense. Detailed plans showing facilities and operating procedures to provide this protection shall be submitted to the city for review and approval prior to construction of the facility. Review and approval of such plans and operating procedures shall not relieve Elk River, Minnesota, Code of Ordinances Page 20 -CODE OF ORDINANCES Chapter 78- UTILITIES ARTICLE III. -SEWERS AND SEWAGE DISPOSAL DIVISION 2. -SEWER USE AND DISCHARGE REQUIREMENTS Subdivision III. - Discharge Restrictions any user from the responsibility to modify the user's facility as necessary to meet the requirements of this division. Users shall notify the city immediately upon having a slug or accidental discharge of substances of wastewater in violation of this division to enable countermeasures to be taken by the city to minimize damage to the wastewater treatment works. Such notification will not relieve any user of any liability for any expense, loss or damage to the wastewater treatment system or treatment process, or for any fines imposed on the city on account thereof under any state and federal law. Employers shall ensure that all employees who may cause or discover such a discharge are advised of the emergency notification procedure. (Code 1982, § 1300.02(17)) Sec. 78-162. - Catchbasins and waste traps. No person having charge of any building or other premises which drains into the public sewer shall permit any substance or matter which may form a deposit or obstruction to flow or pass into the public sewer. Within 15 days after receipt of written notice from the city, the owner shall install a suitable and sufficient catchbasin or waste trap, or, if one already exists, shall clean out, repair or alter the catchbasin or waste trap, and perform such other work as the city may deem necessary. Upon the owner's refusal or neglect to install a catchbasin or waste trap or to clean out, repair or alter the catchbasin or waste trap after the period of 15 days, the city may cause such work to be completed at the expense of the owner or representative thereof. (Code 1982, § 1300.02(18)) Sec. 78-163. - Motor vehicle washing or servicing facilities. The owner or operator of any motor vehicle washing or servicing facility shall provide and maintain in serviceable condition, at all times, a catchbasin or waste trap in the building drain system to prevent grease, oil, dirt or mineral deposits from entering the public sewer system. (Code 1982, § 1300.02(20)) Secs. 78-164^78-180. - Reserved. Elk River, Minnesota, Code of Ordinances Page 21 Appendix H Environmental Information Worksheet (EIW) Minnesota Pollution Environmental Information Control Agency+ 520 Lafayette Road Worksheet (EIW) Form StYaul,MN55155-1194 Clean Water State Revolving Fund Minnesota Rule Chapter 7077.0272, subp. 2.a.F. Minnesota Rule Chapter 7077.0277, subp. 3.E. Doc Type:Environmental Information Worksheet Eligible applicants seeking funds for clean water(stormwater and wastewater) projects through the Clean Water State Revolving Fund (commonly referred to as the CWSRF Program) are required by Minn. R. ch. 7077.0272, subp. 2.a. F. and Minn. R. ch. 7077.0277, subp. 3.E.,to complete an Environmental Information Worksheet(EIW). This information will be used to assess environmental impacts, if any, caused by the project. For assistance with this worksheet, please visit the Minnesota Pollution Control Agency's website at http://www.pca.state.mn.us/publications/p-earl-02.Ddf for detailed instructions on completing this form. 1. Project title: Elk River Wastewater Treatment Facility Improvements 2. Proposer: City of Elk River Contact person: Seth Peterson, P.E. Title: Principal Engineer, Bolton &Menk, Inc. Address: 12224 Nicollet Avenue Burnsville, MN 55337 Phone: 952-890-0509 Fax: 952-890-8065 3. Project location: County: Sherburne City/Twp: Elk River NE 1/4 1/4 Section: 3 Township: 32N Range: 26W Tables, Figures, and Appendices attached to the EIW: • County map showing the general location of the project; • United States Geological Survey 7.5 minute, 1:24,000 scale map indicating project boundaries(photocopy acceptable); • Site plan showing all significant project and natural features. 4. Description: a. Provide a project summary of 50 words or less. Improvements to the existing wastewater treatment facility including new primary clarifiers, new blower and sludge pumping buildings, and a new extended aeration activated sludge tank. b. Give a complete description of the proposed project and related new construction. Attach additional sheets as necessary. Emphasize construction, operation methods and features that will cause physical manipulation of the environment or will produce wastes. Include modifications to existing equipment or industrial processes and significant demolition, removal or remodeling of existing structures. Indicate the timing and duration of construction activities. The proposed project is an expansion of the existing mechanical wastewater treatment facility(WWTF)to meet the following design flows and loadings: Average Wet Weather Flow(AWW) 3.55 MGD Peak Hourly Wet Weather Flow(PHWW) 5.68 MGD www.pca.state.mn.us 651-296-6300 800-657-3864 TTY 651-282-5332 or 800-657-3864 • Available in alternative formats wq-wwtp2-20 • 8117112 Page 1 of 7 Peak Instantaneous Wet Weather Flow(PIWW) 7.10 MGD Carbonaceous Biochemical Oxygen Demand (CBOD5) 8,518 lb/day Total Suspended Solids (TSS) 7,808 lb/day Total Kjeldahl Nitrogen (TKN) 1,065 lb/day Total Phosphorus (P) 213 lb/day Construction activities include primary clarifiers, trickling filter improvements, activated sludge addition, covers for the existing final clarifiers, and UV disinfection improvements. The new clarifiers and activated sludge tanks are partially below grade,cast- in-place concrete facilities. Erosion control will be provided for the excavated material. Excess material will be wasted off-site with prompt establishment of a vegetative cover. A detailed description of improvements for each process is provided below. Primary Clarifiers To meet flow requirements the existing facility would need an additional 2.66 MGD of capacity. This could be accomplished by the addition of two 40-foot diameter clarifiers that could be brought in to service in two phases. One additional 40-foot clarifier would provide enough total capacity for a flow of 4.52 MGD. Once flows reached 90%of the capacity of the three clarifiers the fourth clarifier could be brought on line which would increase the total capacity of the primary clarifiers to 6.03 MGD. With all four primary clarifiers online the system would meet the design requirements. Staging the addition of the third and fourth clarifiers would provide easier operation at current flows. Sizing of the additional clarifiers was based on Ten States Standards which states that the primary clarifiers receiving waste activated sludge would be designed for a surface overflow rate of 1200 gpd/ft2. Trickling Filters Improvements to the trickling filters will include modifications to the trickling filter operation and recirculation piping. The modifications would include operation of the two trickling filters in parallel with pumping and piping modifications to achieve a recirculation rate of 100 percent. Other possible modifications include improvements to the distribution arm, controls, ventilation, and access ways. Activated Sludge Process Since the existing trickling filters do not have enough capacity to treat all the flows and loadings, an additional biological wastewater treatment process is required. In order to provide a reliable, easy to operate system, an extended aeration activated sludge process would be constructed. The extended aeration basin will be designed with a solids retention time of 20 days, organic loading of 15 lb/day/1,000 cubic feet of basin volume, a food to mass (F/M) ratio between 0.04-0.10 Ibs CBOD5/Ibs MLVSS/day, a Mixed Liquor Suspended Solids(MLSS) between 2,000-5,000 mg/I, and 1.1 Ibs 02/Ibs of peak hourly CBOD5. A concrete aeration basin containing three cells with a total volume of 1.8 MG would be provided to meet the design loading conditions. The basin would be approximately 115 feet square with a side water depth of 18 feet. During the activated sludge process more biomass is produced as bacteria consume the organic matter in the wastewater. To avoid excessively high MLSS and effluent solid losses, periodic solids wasting is required. Wasting of solids would occur from the final clarifiers after settling and would be used to maintain a desired MLSS concentration within the aeration basin. In addition, Return Activated Sludge (RAS)would be returned to the aeration basins from the final clarifiers to maintain a healthy and active biomass within the system. To accommodate the RAS/WAS pumping needs a new RAS/WAS building would be constructed. This building would house new sludge pumps and flow meters so return and waste flows could be accurately controlled and measured. Sand Filters The existing gravity filters have a design flow of 7.0 MGD and will have adequate capacity to meet the flow of 5.68 MGD for the design year 2035. To optimize filter operation, modifications of the filter controls, media, and the chlorine feed system will be evaluated. Modifications to the chlorine feed system shall include an inline chlorine analyzer to protect against over chlorination. Disinfection System Capacity of the existing UV system is 3.0 MGD which is 2.67 MGD short in capacity for design flows. To meet the design requirements, new UV equipment would need to be installed in the existing spare channel which would increase the total capacity to 6.0 MGD. Additional improvements would include replacing the effluent weir on the existing UV channel with a fixed depth finger weir. Electrical/Controls The existing control system does not include a central control system for the entire wastewater treatment facility. Upgrades to the control system should include a central control system that will allow the operators to monitor and control all units of the treatment process from one location. Biosolids Handling Facilities www.pca.state.mn.us 651-296-6300 800-657-3864 TTY 651-282-5332 or 800-657-3864 • Available in alternative formats wq-wwtp2-20 • 8117112 Page 2 of 7 Improvements to the biosolids handling facility would include provisions to pump sludge to Great River Energy(GRE)for processing. In return, GRE would require the Elk River WWTF to take clarifier water from GRE for treatment. Clarifier flows from GRE would be approximately 150,000 gpd which is fairly insignificant at the future design flows for the Elk River WWTF. Since GRE would accept untreated biosolids,the Elk River WWTF could abandon the existing biosolids treatment process and utilize the existing infrastructure to support pumping of biosolids to GRE. This would include addition of an aeration system in the existing digester and sludge storage tank so they could be used as aerated storage for biosolids that are to be pumped to GRE. Pumping and piping modifications would also be required to pump biosolids to GRE. c. Explain the project purpose; if the project will be carried out by a governmental unit, explain the need for the project and identify its beneficiaries. The purpose of the project is to increase the treatment capacity of the Elk Rlver(WWTF)to accommodate residential and commercial growth. d. Are future stages of this development including development on any outlots planned or likely to happen? ® Yes ❑No If yes, briefly describe future stages, relationship to present project, timeline and plans for environmental review. Further expansion of the facility may be required in the next 10-15 years if flows increase to the facility. Any new construction would stay within the current property boundaries of this project. The environmental review process will be initiated when further facility upgrades are necessary. e. Is this project a subsequent stage of an earlier project? ® Yes ❑ No If yes, briefly describe the past development, timeline and any past environmental review. Original construction of the wastewater treatment facilty was done in 1977 with the most recent upgrade coming in 2005. The environmental review for the 2005 improvements concluded that the facility would not have any significant impacts on the water quality of the receiving water. It also concluded that there were no endangered or threatened species that were known to be located near the Elk River WWTF. 5. Project magnitude data Total Project Area(acres) 3 acre or Length (miles) Number of Residential Units: Unattached Attached maximum units per building Commercial/Industrial/Institutional Building Area (gross floor space): total square feet Indicate area of specific uses (in square feet): Office Manufacturing Retail Other Industrial Warehouse Institutional Light Industrial Agricultural Other Commercial (specify) Building height If over 2 stories, compare to heights of nearby buildings 6. Permits and approvals required. List all known local, state and federal permits, approvals and financial assistance for the project. Include modifications of any existing permits, governmental review of plans, and all direct and indirect forms of public financial assistance including bond guarantees, Tax Increment Financing and infrastructure. Unit of government Type of application Status MPCA NPDES Permit Not Submitted MPCA Facility Plan Approval Submitted MPCA Plans/Specifications Approval Not Submitted MPCA General Storm Water Permit Not Submitted Sherburne County Conditional Use Permit Not Submitted 7. Land use. Describe current and recent past land use and development on the site and on adjacent lands. Discuss project compatibility with adjacent and nearby land uses. Indicate whether any potential conflicts involve environmental matters. Identify any potential environmental hazards due to past site uses, such as soil contamination or abandoned storage tanks, or proximity to nearby hazardous liquid or gas pipelines. The improvements would be done on the site of the existing facility. No potential environmental hazards are know at this time. www.pca.state.mn.us 651-296-6300 800-657-3864 TTY 651-282-5332 or 800-657-3864 • Available in alternative formats wq-wwtp2-20 • 8117112 Page 3 of 7 8. Cover types. Estimate the acreage of the site with each of the following cover types before and after development: Before After Before After Types 1-8 wetlands Lawn/landscaping 0.25 0.40 Wooded/forest Impervious Surfaces 3.05 2.90 Brush/grassland Other(describe) Cropland Total 3.3 3.3 9. Fish,wildlife,and ecologically sensitive resources. a. Identify fish and wildlife resources and habitats on or near the site and describe how they would be affected by the project. Describe any measures to be taken to minimize or avoid impacts. The existing facility currently discharges to the Mississippi River. The upgraded facility will continue to dischargeto the Mississippi River. Although the quantity of water discharged will increase, the quality will increase and no adverse affects are anticipated to impact the fish and wildlife presently inhabiting the area. b. Are any state(endangered or threatened)species, rare plant communities or other sensitive ecological resources such as native prairie habitat, colonial waterbird nesting colonies or regionally rare plant communities on or near the site? ❑ Yes ® No If yes,describe the resource and how it would be affected by the project. Indicate if a site survey of the resources has been conducted and describe the results. If the Minnesota Department of Natural Resources(DNR) Natural Heritage and Nongame Research program has been contacted give the correspondence reference number: Describe measures to minimize or avoid adverse impacts. 10. Physical impacts on water resources.Will the project involve the physical or hydrologic alteration (dredging, filling,stream diversion, outfall structure, diking, and impoundment)of any surface waters such as a lake, pond,wetland,stream or drainage ditch? ❑ Yes ® No If yes, identify water resource affected. Describe alternatives considered and proposed mitigation measures to minimize impacts. Give the DNR Protected Waters Inventory(PWI) number(s) if the water resources affected are on the PWI. 11. Water use.Will the project involve installation or abandonment of any water wells, connection to or changes in any public water supply or appropriation of any ground or surface water(including dewatering)? ❑ Yes ® No If yes, as applicable, give location and purpose of any new wells; public supply affected, changes to be made, and water quantities to be used;the source, duration, quantity and purpose of any appropriations; and unique well numbers and DNR appropriation permit numbers, if known. Identify any existing and new wells on the site map. If there are no wells known on site, explain methodology used to determine. 12. Water-related land use management districts. Does any part of the project involve a shoreland zoning district, a delineated 100-year flood plain, or a state or federally designated wild or scenic river land use district? ❑ Yes ® No If yes, identify the district and discuss project compatibility with district land use restrictions. 13. Water surface use.Will the project change the number or type of watercraft on any water body? ❑ Yes ® No If yes, indicate the current and projected watercraft usage and discuss any potential overcrowding or conflicts with other uses. 14. Erosion and sedimentation.Give the acreage to be graded or excavated and the cubic yards of soil to be moved: 1.0 Acres: 10,000 cubic yards. Describe any steep slopes or highly erodible soils and identify them on the site map. Describe any erosion and sedimentation control measures to be used during and after project construction. Best management practices to control erosion and sedimentation will be employed where necessary. www.pca.state.mn.us 651-296-6300 800-657-3864 TTY 651-282-5332 or 800-657-3864 • Available in alternative formats wq-wwtp2-20 • 8117112 Page 4 of 7 15. Water quality—surface-water runoff. a. Compare the quantity and quality of site runoff before and after the project. Describe permanent controls to manage or treat runoff. Describe any storm water pollution prevention plans. The quantity and quality of site runoff will not change as there is not a significant change in impervious surfaces from this project. b. Identify routes and receiving water bodies for runoff from the site; include major downstream water bodies as well as the immediate receiving waters. Estimate impact runoff on the quality of receiving waters. Existing storm water intakes will collect runoff and discharge it to the Mississippi River. Runoff from the site should have no impact on the receiving water. 16. Water quality—wastewater. a. Describe sources, composition and quantities of all sanitary, municipal and industrial wastewater produced or treated at the site. The proposed site will receive domestic and industrial wastewater. The facility will be improved to handle an AWW flow of 3.55 MGD with CBOD and TSS loadings of 8,518 lb/day and 7,808 lb/day respectively. b. Describe waste treatment methods or pollution prevention efforts and give estimates of composition after treatment. Identify receiving waters, including major downstream water bodies, and estimate the discharge impact on the quality of receiving waters. If the project involves on-site sewage systems,discuss the suitability of site conditions for such systems. The expanded treatment facility will include screening,grit removal, primary clarification, biological treatment with trickling filters and activated sludge, final clarification, sand filters, and disinfection. The limits for the discharge water are expected to be as follows: CBOD5-25 mg/I TSS-30 mg/I Fecal Coliform -200/100 ml Mercury-6.9 ng/I pH -6.0-9.0 SU Phosphorus- 1.0 mg/I C. If wastes will be discharged into a publicly owned treatment facility, identify the facility, describe any pretreatment provisions and discuss the facility's ability to handle the volume and composition of wastes, identifying any improvements necessary. NA d. If the project requires disposal of liquid animal manure, describe disposal technique and location and discuss capacity to handle the volume and composition of manure. Identify any improvements necessary. Describe any required setbacks for land disposal systems. NA 17. Geologic hazards and soil conditions. a. Approximate depth (in feet)to Groundwater 20 minimum; 30 average. Bedrock: 100 minimum; 150 average. Describe any of the following geologic site hazards to groundwater and also identify them on the site map:sinkholes, shallow limestone formations or karst conditions. Describe measures to avoid or minimize environmental problems due to any of these hazards. No geological site hazards have been indentified. b. Describe the soils on the site, giving U.S. Soil Conservation Service (SCS)classifications, if known. Discuss soil granularity and potential for groundwater contamination from wastes or chemicals spread or spilled onto the soils. Discuss any mitigation measures to prevent such contamination. Soils consist of 1/2 to 3 1/2 feet of silty sand fill or topsoil at the surface. Naturallly deposited glacial outwash sands were present below the fill to depths of 20-30 feet. Glacial till consisting of silty sand was present at depths of 35-45 feet. The sands contained variable amounts of gravel,with some layers of gravel and occasional cobbles. www.pca.state.mn.us 651-296-6300 800-657-3864 TTY 651-282-5332 or 800-657-3864 • Available in alternative formats wq-wwtp2-20 • 8117112 Page 5 of 7 18. Solid wastes, hazardous wastes,storage tanks. a. Describe types, amounts and compositions of solid or hazardous wastes, including solid animal manure, sludge and ash, produced during construction and operation. Identify method and location of disposal. For projects generating municipal solid waste, indicate if there is a source separation plan;describe how the project will be modified for recycling. If hazardous waste is generated, indicate if there is a hazardous waste minimization plan and routine hazardous waste reduction assessments. Biosolids produced on site will be sent to Great River Energy for incineration. b. Identify any toxic or hazardous materials to be used or present at the site and identify measures to be used to prevent them from contaminating groundwater. If the use of toxic or hazardous materials will lead to a regulated waste, discharge or emission, discuss any alternatives considered to minimize or eliminate the waste, discharge or emission. Wastewater treatment chemicals including ferric chloride and chlorine will be properly stored and contained. C. Indicate the number, location, size and use of any above or below ground tanks to store petroleum products or other materials, except water. Describe any emergency response containment plans. There are no known above or below ground tanks used to store petroleum products. The wastewater treatment chemicals used will be properly stored above ground with secondary containment. 19. Traffic. Parking spaces added: 0 Existing spaces (if project involves expansion): Estimated total average daily traffic generated: Less than 10 Estimated maximum peak hour traffic generated (if known) and its timing: Provide an estimate of the impact on traffic congestion affected roads and describe any traffic improvements necessary. If the project is within the Twin Cities metropolitan area, discuss its impact on the regional transportation system. 20. Vehicle-related air emissions. Estimate the effect of the project's traffic generation on air quality, including carbon monoxide levels. Discuss the effect of traffic improvements or other mitigation measures on air quality impacts. Note: If the project involves 500 or more parking spaces, consult Environmental Assessment Worksheet(EAW) Guidelines about whether a detailed air quality analysis is needed. Vehicle-related air emissions will temporarily increase during construction due to the use of heavy, diesel powered, construction equipment. The site will provide parking for the maximum number of city employees on site and a likely number of visitors at the site at one time. The new facility will not affect traffic to the site. 21. Stationary source air emissions. Describe the type, sources, quantities and compositions of any emissions from stationary sources of air emissions such as boilers, exhaust stacks or fugitive dust sources. Include any hazardous air pollutants (consult EAW Guidelines for a listing), any greenhouse gases (such as carbon dioxide, methane, and nitrous oxides), and ozone- depleting chemicals (chlorofluorocarbons, hydrofluorocarbons, perfluorocarbons or sulfur hexafluoride). Also describe any proposed pollution prevention techniques and proposed air pollution control devices. Describe the impacts on air quality. The project does not include the addition of any stationary sources of air emissions. 22. Odors, noise,and dust.Will the project generate odors, noise or dust during construction or during operation? ® Yes ❑ No If yes, describe sources,characteristics, duration, quantities or intensity and any proposed measures to mitigate adverse impacts. Also identify locations of nearby sensitive receptors and estimate impacts on them. Discuss potential impacts on human health or quality of life. (Note:fugitive dust generated by operations may be discussed at item 23 instead of here.) Dust and noise will be generated daily during the construction phase of the proposed project which is estimated at 12 to 18 months. Measures to mitigate dust emissions from construction activities include application of water to areas actively graded and avoidance of construction activities during periods of high winds. Additional dust controls will include minimizing the amount of open graded areas as well as watering regularly, particularly in areas with soils susceptible to wind erosion. Following completion of construction, the site will be final graded, seeded and mulched to revegetate disrupted areas and minimize dust. Odors are reduced at the facility with enclosed pretreatment facilities,covered final clarifiers and biosolids storage facilities. The primary source of noise pollution at a WWTF is the emergency generator. This equipment is used only in the event of a power outage or to reduce peak electric demands. 23. Nearby resources.Are any of the following resources on or in proximity to the site? Projects should search the State Historic Preservation Office's (SHPO) National Register of Historic Places database by calling 651-259-3453. *Note: Project proposers must contact the SHPO at Thomas.cinadr(cbmnhs.oro or 651-259-3453 to request a database review to obtain information on any known historical or archaeological sites in the project area. www.pca.state.mn.us 651-296-6300 800-657-3864 TTY 651-282-5332 or 800-657-3864 • Available in alternative formats wq-wwtp2-20 • 8117112 Page 6 of 7 Include a copy of correspondence with SHPO with the submittal of this EIW form. a. Archaeological, historical, or architectural resources? ❑ Yes ❑ No b. Prime or unique farmlands or land within an agricultural preserve? ❑ Yes ❑ No C. Designated parks, recreation areas, or trails? ❑ Yes ❑ No d. Scenic views and vistas? ❑ Yes ❑ No e. Other unique resources? ❑ Yes ❑ No If yes, describe the resource and identify any project-related impacts on the resources. Describe any measures to minimize or avoid adverse impacts. 24. Visual impacts.Will the project create adverse visual impacts during construction or operation? Such as glare from intense lights, lights visible in wilderness areas and large visible plumes from cooling towers or exhaust stacks? ❑ Yes ® No If yes, explain. Construction is limited to normal working hours. Evening and weekend work is typically only warranted when low flow conditions are required to perform a certain activity. 25. Compatibility with plans and land use regulations. Is the project subject to an adopted local comprehensive plan, land use plan or regulation, or other applicable land use, water, or resource management plan of a local, regional, state or federal agency? ❑ Yes ® No If yes, describe the plan, discuss its compatibility with the project and explain how any conflicts will be resolved. If no, explain. 26. Impact on infrastructure and public services.Will new or expanded utilities, roads,other infrastructure or public services be required to serve the project? ❑ Yes ® No If yes, describe the new or additional infrastructure or services needed. (Note: any infrastructure that is a connected action with respect to the project must be assessed in the EAW;see EAW Guidelines for details.) 27. Cumulative impacts. Minn. R. 4410.1700,subp. 7, item B requires that the RGU consider the"cumulative potential effects of related or anticipated future projects"when determining the need for an environmental impact statement. Identify any past, present or reasonably foreseeable future projects that may interact with the project described in this EAW in such a way as to cause cumulative impacts. Describe the nature of the cumulative impacts and summarize any other available information relevant to determining whether there is potential for significant environmental effects due to cumulative impacts (or discuss each cumulative impact under appropriate item(s) elsewhere on this form). Expansion of the WWTF enables the City of Elk River to grow and develop. 28. Other potential environmental impacts. If the project may cause any adverse environmental impacts not addressed by items 1 to 28, identify and discuss them here, along with any proposed mitigation. No other potential environmental impacts were indentified. 29. Summary of issues. List any impacts and issues identified above that may require further investigation before the project is begun. Discuss any alternatives or mitigative measures that have been or may be considered for these impacts and issues, including those that have been or may be ordered as permit conditions. No impacts or issues were identified that require further investigation. Mitigative measures previously discussed include best management practices during and after construction to reduce erosion and spill potential as the site. www.pca.state.mn.us 651-296-6300 800-657-3864 TTY 651-282-5332 or 800-657-3864 • Available in alternative formats wq-wwtp2-20 • 8117112 Page 7 of 7 ; aal C 3 o ti oa O C '� y y l�■Y■� lk - - IL 0 N A Lo b K :p Ld :W m x— a W.R �c m 0 o c 0 b b y _ y • co t9 . bt - s+1.3 N aka'=s� v � � � � � � �'��f ` _ ■ �. - �� - �V Novas 0 _ 6A u 3p se c° ■ s -N r °e �- z - n-° OL � N m u � T.32 N. T.33 N. T.34 N. T.35 N. DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT Page S Permit KNO020188 Topogralihic Map of Permitted Facility NI 0020788,Elk River WNTEF T32N,R26W,Section 3 Elk River.Sherburne County,Minnesota `'*rs� �ait�9�., t + �^ c `y ,r 1 i '{ •�."`'`• "� r �I� Yr Qf IZ t y 'four 1 P ( t , a 1TM i 1 n. 14 t t Map producted by:MPCA Siaff_WOW07 Source:USGS Elk River Quad 0 0.1 0.2 0.4 Files Scale_1:24;000 5 < ------------ mom ----- ----------- o------ ------ w4ffi- Li V 6.1 --MTMTFFFF" z Brian Guldan From: Thomas Cinadr [thomas.cinadr@a mnhs.org] Sent: Wednesday, February 20, 2013 12:36 PM To: Brian Guldan Subject: Re: Elk River Wastewater Treatment Facility Plan THIS EMAIL IS NOT A PROJECT CLEARANCE. This message simply reports the results of the cultural resources database search you requested. The database search produced results for only previously known archaeological sites and historic properties. Please read the note below carefully. No archaeological sites or historic structures were identified in a search of the Minnesota Archaeological Inventory and Historic Structures Inventory for the search area requested. The result of this database search provides a listing of recorded archaeological sites and historic architectural properties that are included in the current SHPO databases.Because the majority of archaeological sites in the state and many historic architectural properties have not been recorded,important sites or structures may exist within the search area and may be affected by development projects within that area.Additional research,including field survey,may be necessary to adequately assess the area's potential to contain historic properties. If you require a comprehensive assessment of a project's potential to impact archaeological sites or historic architectural properties, you may need to hire a qualified archaeologist and/or historian.If you need assistance with a project review,please contact Kelly Gragg-Johnson in Review and Compliance @ 651-259-3455 or by email at kelly.graggiohnson @mnhs.org. The Minnesota SHPO Survey Manuals and Database Metadata and Contractor Lists can be found at http://www.nmhs.org/shpo/survey/inventories.htm Tom Cinadr Survey and Information Management Coordinator Minnesota State Historic Preservation Office Minnesota Historical Society 345 Kellogg Blvd. West St. Paul, MN 55102 651-259-3453 t On Wed, Feb 20, 2013 at 12:19 PM, Brian Guldan <briangu @bolton-menk.conv wrote: Tom, The facility is located in the NE%of Section 3,Township 32N, Range 26W. Brian J. Guldan, PE Environmental Project Engineer Bolton & Menk, Inc. Consulting Engineers&Surveyors P:(952)890.0509 ext.2658 Cel:(612)499.0533 F.(952)890.8065 From: Thomas Cinadr [mailto:thomas.cinadr(a)mnhs.ora] Sent: Wednesday, February 20, 2013 12:15 PM To: Brian Guldan Subject: Re: Elk River Wastewater Treatment Facility Plan Brian, Please send me the Township/Range/Section(s) you wish to be searched. Tom Cinadr Survey and Information Management Coordinator Minnesota State Historic Preservation Office 2 Minnesota Historical Society 345 Kellogg Blvd. West St. Paul, MN 55102 651-259-3453 On Thu, Feb 14, 2013 at 3:03 PM, Brian Guldan<brianjzu @bolton-menk.com>wrote: Thomas, I am contacting you to request a database review to obtain information on any known historical or archaeological sites near our project area. The address of the project is 248 Railroad Drive, Elk River, MN 55330. Feel free to contact me if you need any further information. Brian J. Guldan, PE Environmental Project Engineer Bolton & Menk, Inc. Consulting Engineers&Surveyors P:(952)890.0509 ext. 2658 Cel: (612)499.0533 F. (952)890.8065 This email has been scanned by the Symantec Email Security.cloud service. For more information please visit http://www.symanteccloud.com 3 This email has been scanned by the Symantec Email Security.cloud service. For more information please visit http://www.symanteccloud.com This email has been scanned by the Symantec Email Security.cloud service. For more information please visit http://www.symanteccloud.com This email has been scanned by the Symantec Email Security.cloud service. For more information please visit http://www.symanteccloud.com 4 Wastewater Treatment Facility Plan March 2013 Purpose Provide the City with the Necessary Information  to Plan for Needed and Required Upgrades to the Wastewater System Provide Options to Meet the Requirements of  the MN Pollution Control Agency (MPCA) Estimate Costs for All Needed and  Recommended Improvements Comply with Requirements Necessary to Obtain  Public Facilities Authority (PFA) Funding 2 Design Parameters Design Year -2035  Population Projections  Option 1 (All Users within Urbane Service Area ): – 35,467 Equivalent Users Option 2 (All Users Including Future Developement – Outside the Urban Service Area): 45,388 Equivalent Users 3 4 5 Design Parameters (cont.) ParameterHistorical (2006-2011)Option 1DesignOption 2 Design Average Dry Weather Flow (ADW)1.142 mgd3.11 mgd3.98 mgd Average Wet Weather Flow (AWW-30 1.302 mgd3.55 mgd4.54 mgd Days) Peak Hourly Wet Weather Flow (PHWW)NA5.68 mgd7.27 mgd Peak Instant Wet Weather Flow (PIWW)NA7.10 mgd9.08 mgd Average CBOD/Day2,848 lb/day8,518 lb/day10,899 lb/day Average TSS/day1,549 lb/day7,808 lb/day9,990 lb/day Average TKN/dayNA213 lb/day273 lb/day Average Phosphorous/day67 lb/day1,065 lb/day1,362 lb/day 6 Existing WWTF -Summary Mechanical Activated Sludge Facility  Two Fine Screens – Grit Removal – Two Primary Clarifiers – Two Trickling Filters – Aeration Basin (Structure Only-Not in Service) – Three Final Clarifiers – Six Sand Filters – Ultraviolet Disinfection (UV) – Anaerobic Digesters and Sludge Storage tanks – Discharges to the Mississippi River  Several Treatment Units Do Not Meet the Required  Capacity for the Design Year 2032 7 8 Existing WWTF –Needed Improvements Grit Removal  Addition of a Grit Cyclone – Primary Clarifiers  Construct Two New 40-foot Diameter Clarifiers – Provide Improvements to Sludge Handling Equipment – Trickling Filters  Improvements to the Recirculation Pumping and Controls – Improvements to the Distributor Arm, Access Way, and – Ventilation System 9 Existing WWTF –Needed Imp. (cont.) Activated Sludge Process  New Aeration Basin with Provisions for Biological – Phosphorus Removal Sludge Pumping Building – Blower Building – Final Clarifiers  Provide Covers for the Three Existing Final Clarifiers – Filters  Update Controls to Optimize Operations – Provide a Chlorine Feed System to Inhibit Biological Growth – 10 Existing WWTF –Needed Imp. (cont.) Disinfection  Install New UV Equipment in the Existing Spare Channel – Electrical/Controls  Update Controls System to Provide a Centralized Control – System for All Treatment Units Biosolids Handling  Use Anaerobic Digestion Process to Reduce Biosolids Volume – Provide Sludge Pumping to Great River Energy (GRE) – Other  Construct a New Control Building with Garage Space – 11 12 13 Comparison of Design Options Treatment UnitRequired ImprovementsDifferences Option 1Option 2 Grit RemovalNewCycloneNewCycloneNone Primary ClarifiersTwo40-foot ClarifiersTwo40-foot ClarifiersNone Trickling FiltersPump/Controls UpgradePump/Controls UpgradeNone Activated Sludge1.8 Million Gallons2.6 Million GallonsOption 2 Requires More Aeration Volume Final ClarifiersNew CoversNew CoversNone FiltersControls/ChlorinationControls/ChlorinationNone UV DisinfectionOneNew UV UnitTwo New UV UnitsOption 2 Requires anAdditional New Unit 14 Liquid Stream Improvements Cost Estimate ItemCost Design Option No. 1Design Option No. 2 Mobilization$300,000$300,000 Site Work$600,000$600,000 Site Piping/Valves$200,000$200,000 Grit Cyclone$15,000$15,000 Clarifier Equipment for Existing and New (4)$500,000$500,000 New Clarifier Structure (2)$200,000$200,000 Trickling Filter Improvements$250,000$250,000 Activated Sludge Basins $1,350,000$1,950,000 Fine Pore Diffusers$140,000$200,000 Blowers$250,000$300,000 Secondary Clarifier Covers (3)$300,000$300,000 RAS/WAS Building and Pumps$200,000$200,000 Filter Chlorination System$30,000$30,000 UV Upgrades$200,000$400,000 Blower/Sludge Pumping Building$200,000$200,000 Electrical/Controls$1,500,000$1,700,000 New Control Building/Garage$1,200,000$1,200,000 Total Construction Cost $7,435,000$8,495,000 Contingency (10 %)$744,000$850,000 Engineering/Admin (15%)$1,115,000$1,274,000 Total Project Cost$9,294,000$10,619,000 15 Biosolids Handling Alternatives Construct a Heat Drying Facility  Small Footprint – Produces Class A Biosolids – Reduces Volume Required for Land Application – High Capital Cost – Higher Operating Cost – Expand Anaerobic Digestion System  Extremely Large Footprint – Requires Large Biosolids Storage Volume – Large Quantity of Biosolids to be Land Applied – High Capital Costs – Not Practical Given the Land Constraints of the Site – 16 Biosolids Handling Alt.’s (Cont.) Pump to Great River Energy (GRE) for Incineration  Minimal Capital Costs – Extremely Low Operating Costs – Minimal Operator Time Requirements – Regionalization (City of Buffalo)  Minimal Capital Cost – High Treatment and Hauling Costs – Not Economically Feasible as a Long Term Solution – Should be Discussed with the City of Buffalo as a Backup – Plan 17 18 19 Biosolids Handling Cost Estimate Heat Drying ItemCost Mobilization$300,000 Site Work$200,000 Site Piping$100,000 Building (12,000 sq ft)$1,560,000 Polymer Feed System$50,000 Pumps/Piping$150,000 Dewatering Equipment$600,000 Sludge Storage Aeration Equipment$150,000 Heat Drying Equipment$4,000,000 Conveying Systems$50,000 Odor Control System$150,000 Mechanical$750,000 Electrical/Controls$800,000 Total Construction Cost $8,860,000 Contingency (10 %)$886,000 Engineering/Admin (15%)$1,329,000 Total Project Cost$11,075,000 20 Biosolids Handling Cost Estimate Pump to Great River Energy ItemCost Site Work/Site Piping$150,000 Pumps$125,000 Sludge Storage Aeration Equipment$175,000 Electrical/Controls$90,000 Total Construction Cost $540,000 Contingency (10 %)$54,000 Engineering/Admin (15%)$81,000 Total Project Cost$675,000 21 Recommendations Implement Option 2 (Except UV)  Implement Biosolids Pumping to GRE  Discuss a Biosolids Treatment Contract with the  City of Buffalo for Emergency Needs. Keep Existing Biosolids Land Application Sites  for Backup Biosolids Disposal Plans. 22 Funding & Financing Options Bonding  Assessment  State Revolving Fund Loan (PFA)  Grants  Cash Reserves  23 Impact on Wastewater User Rates Percent Allocation of SAC Revenue to WWTF 100%75%50%25% Loan Cost (20 Years @ 4%)$794,200$794,200$794,200$794,200 SAC Yearly Revenue Allocated to WWTF$956,300$717,200$478,100$239,100 Revenue Needed from User Fees-$162,000$77,000$316,100$555,200 Cost Increase per 1,000 GallonsNA$0.18$0.72$1.27 Monthly Increase for 5,000 Gallon UserNA$0.88$3.61$6.34 24 Proposed Improvement Schedule ItemCompletion Date Submit Facility Plan to MPCA for review and approvalMarch 2013 City requests placement on MPCA Project Priority ListMarch 2013 MPCA reviews and approves Facility Plan.April –July 2013 City requests placement on the MPCA 2013 Intended Use PlanMay 2013 Prepare plans and specifications for the wastewater treatment facility August –November 2013 improvements 2013 Intended Use Plan is approved by MPCA.September 2013 Submit plans and specifications to MPCA for review and approval.December 2013 –February 2014 City advertises, open bids, and accepts construction bids for facility March –April 2014 improvements. Initiate construction of wastewater treatment facility improvements.May 2014 Complete construction of wastewater treatment facility improvements May 2016 and meet discharge standards. 25 Questions / Discussion 26