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7.2a SR 06-20-2023�, Elk s �- River Request for Action To Item Number Ma Tor and CinT Council 7.2 a Agenda Section Meeting Date Prepared by Public Hearin s une 20, 2023 Chris Leeseber , Senior Planner Item Description Reviewed by Waste Management — Elk River Landfill, LLC, 221 st Zack Carlton, Communitv Develo ment Director Avenue/22460 US Highway 169 Reviewed by Ordinance: Solid Waste Facility Overlay District Cal Portner, Cit�T Administrator Action Requested Adopt, by motion, an ordinance amending CityT Ordinance Section 30-1834 SWF solid waste facilit�r overlayT district. Background/Discussion Case No. OA 23-02 - The Elk River Landfill (ERL) applied foY a Conditional Use PeYmit (CUP), case numbeY CU 23-09, to amend their CUP to incorporate appro�matelyT 20 additional acres of propernT, immediatelyT to the south of the currently permitted landfill footprint The additional land provides no additional capacityT for Municipal Solid Waste (landfill expansion) but will be used for improved/required stormwater management. CurrentlyT, no portion of a solid waste facilityT, including any portion of a solid waste facilityT, easements, water or air rights, storm�vater management facilities, and all buffer areas or buffer zones can occur outside of the Solid Waste FacilityT (SWF) overlay district. For the CUP to be processed, ERL is proposing an ordinance amendment to Section 30-1834(e) to allo`v for stoYmwateY management featuYes for the landfill to be located outside of the SWF overla�r district The amendment has been drafted to allo�v on1�T storm�vater facilities serving approved SWF facilities to be located outside of the SWF overlay district if on a Zoning Lot (adjacent lot undeY common owneYship). Planning Commission During the public hearing, no one spoke for or against the request and staff has not received anyT comments since the commission meeting. The Planning Commission had no questions or concerns about the request and unanimously recommended approval. Financial Impact None Attachments ■ Proposed Ordinance ■ Applicant's Narrative The Elk River Vision A 2a�elcolning co�nlnunity 2a�ith T evolutiona� y and spizzted T esou� cefulness, exceptional se�vice, and coln�nunity engagelnent that encou�ages and ins�iz•es pTo�pe�zty. Pow�REo ar �I'1 ���� Update�l• January 2023 Sec. 30-1834. SWF solid waste facility overlay district. (e) Solirl �araste facilities restricted to Si�F—Solid avaste facilitie� overlay district. No solid waste facilit��, including any poition of a solid waste facility, anyr easements, water oi aii rights, all stormwatei management facilities and all buffei aeeas or buffer zones required, needed or useful for the establishment and/or operation of the solid waste facilit�r, with the exception of facilities necessanr for monitoung the offsite impacts of the facilit�r on ground and surface water, shall be located or opeiated in the city except in those areas of the city located within the Sa/F—Solid waste facilities overla�r zoning district Stoimwatei facilities sei-�ring anoio�red S�F facilities can be located outside of the S�%F o�rerlae district if on a ZoninQ Lot (direcd�� abutting the �ro�ertt� of the a�roved use . �coae 1�8z, � �oo.la�lg�; o�a. No.10-oa, � a, s-15-ao1o� (Supp. No. 57) Created: 2023-03-07 12:38:54 [EST] Page 1 of 1 CU 23-09 Narrative The additional 20-acres of property has been purchased by ERL from Tiller Corporation, now part of Martin Marietta (Tiller). The property is currently used by Tiller for its gravel mining operation, as they retained mineral rights on the property per the terms of the purchase. As has been the practice at the e�sting Landfill, development of Landfill related components (in this case the proposed stormwater management infrastructure) will follow behind Tiller's mining operations. Tiller has an approved CUP from the City for their mining activit�r (including the 20-acre subject propert�T). The additional property will allow for ERL to construct one large stormwater basin to replace the currently permitted design which included two sedimentation basins and would have required a lift station to manage stormwater from the Landfill. The modifications will allow for gravity drainage for stormwater management (eliminating the lift station) and reduce the amount of controlled fill placement requi�ed for perimeter berm construction. For the previous design, stormwater discharge from the site was under the exterior roadway, then under the City of Elk River trail, and ultimately to an upstream wedand on property owned by ERL. The modified design allows for discharge directly west of the proposed pond to an e�sting low area, on property also owned by the Landfill, east of the trail (eliminating the need for the City trail crossing). The proposed sedimentation pond includes settling basins at the east and west ends. A safety bench has been incorporated into the design and perimeter access for cleaning / maintenance activities has been considered. The proposed pond has been designed to provide fle�bilit�- depending on mining activities in the area. The bottom elevation of the pond will be at ma�mum an elevation of 964; the actual elevation may be 964 or lower depending on mining activities. The design presented herein represents the minimum storage capacit�� that would be provided and storm events that would be managed. Actual conditions follo��ing mining activities may provide for management of larger storm events by increasing the available storage capacity. See the attached "Conditional Use Permit Application" for additional details Application to the City of Elk River Elk River Landfill CUP and Ordinance Amendment for Stormwater Management Improvements April 2023 Prepared for: ',o WASTE MANAGEMENT Elk River Landfill, Inc. Prepared by: Stantec Consulting Services Inc. One Carlson Parkway, Suite 100 Plymouth, MN 55447 PERMIT APPLICATION TO THE CITY OF ELK RIVER APRIL 2023 Table of Contents Table of Contents 1.0 INTRODUCTION ..........................................................................................................1.1 1.1 DESCRIPTION OF PROJECT ......................................................................................1.1 1.1.1 Landfill Development and Closure Construction ..........................................1.2 1.1.2 Landfill End Use ..........................................................................................1.2 2.0 APPLICATION REQUIREMENTS ................................................................................2.1 2.1 I NTRODUCTI ON .......................................................................................................... 2.1 2.2 CONDITIONAL USE PERMIT REQUIREMENTS .........................................................2.1 2.3 APPLICATION FEE ......................................................................................................2.2 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 CONDITIONAL USE PERMIT ......................................................................................3.1 EXISTING CONDITIONS AND DEVELOPMENT PLAN ...............................................3.1 LEGAL DESCRIPTION OF THE SUBJECT PROPERTY .............................................3.1 PROJECT NARRATIVE ...............................................................................................3.1 SITE, UTILITY, GRADING / DRAINAGE PLAN ............................................................3.2 LANDSCAPING PLAN .................................................................................................3.2 DRAINAGE CALCULATIONS ......................................................................................3.2 BUILDING ELEVATIONS / FLOOR PLANS ..................................................................3.2 WETLAND DELINEATION / WETLAND MITIGATION .................................................3.2 EAW/EIS REQUIREMENTS .........................................................................................3.3 CONDITIONAL USE PERMIT STANDARDS OF ISSUANCE .......................................3.3 FIGURES Figure 1 — Site Map Figure 2— Site Development Plan Figure 3— Grading and Drainage Plan LIST OF ATTACHMENTS Attachment 1 — Legal Description Attachment 2 — Landscaping Plan Attachment 3 — Existing Conditions Attachment 4 — Drainage Calculations �1 PERMIT APPLICATION TO THE CITY OF ELK RIVER APRIL 2023 Introduction I.� �I�Tf��L7U�TI��V Elk River Landfill, Inc. (ERL), a wholly owned subsidiary of Waste Management of Minnesota, Inc., owns and operates a mixed municipal solid waste (MSWj landfill (Landfill) under Minnesota Solid Waste Permit Number SW-74. The Landfill is located along U.S. TH 169 in the NW'/ of Section 3, T33N, R26W, and the SW'/ of Section 34, T34N, R26W, Sherburne County, Minnesota (see Figure 1). Besides the construction and demolition debris (C&D) landfill immediately and adjacent to the north of the Landfill, the remainder of the existing property owned by ERL provides a buffer surrounding the Landfill. The Landfill is permitted to accept MSW, C&D, yard waste for composting, industrial waste in accordance with a MPCA-approved Industrial Solid Waste Management Plan, and processing facility rejects. ERL maintains a Solid Waste Facility (SWF) license and conditional use permits in accordance with City of Elk River (the City or City) requirements. ERL and the City entered into an agreement on May 25, 2011 for the expansion of the facility into an area referred to as the southern development area (SDA). Based on the agreement, a Land Use Application was submitted to the City of Elk River dated June 27, 2011. Subsequently, the application and an amended Conditional Use Permit (CUP) was approved by the Elk River City Council on September 19, 2011. The SWF license references the amended CUP, and the two documents authorize construction and operation of the currently permitted facility. ERL is proposing to revise the CUP to incorporate approximately 20 additional acres of property, immediately to the south of the currently permitted landfill footprint. The additional 20 acres provides no additional MSW capacity, but instead will be used for improved stormwater management. Concurrent to the proposed CUP revision, ERL is proposing an ordinance amendment to Elk River Code, Chapter 30. Land Development Regulations, Article VI. Zoning, Division 10, Sec. 30-1834.(e) to allow for stormwater management features for the landfill to be located outside of the SWF solid waste facility overlay district boundary. A request for minor modification to the Landfill's MPCA Solid Waste permit (SW-74) will also be submitted to reflect the changes to the site grading and stormwater management features. 1.1 DESCRIPTION OF PROJECT The additional 20-acres of property has been purchased by ERL from Tiller Corporation, now part of Martin Marietta (Tiller). The property is currently used by Tiller for its gravel mining operation, as they retained mineral rights on the property per the terms of the purchase. As has been the practice at the existing Landfill, development of Landfill related components (in this case the proposed stormwater management infrastructure) will follow behind Tiller's mining operations. Tiller has an approved CUP from the City for their mining activity (including the 20-acre subject property). The additional property will allow for ERL to construct one large stormwater basin to replace the currently permitted design which included two sedimentation basins and would have required a lift station to manage stormwater from the Landfill. The modifications will allow for gravity drainage for stormwater �1 1.1 PERMIT APPLICATION TO THE CITY OF ELK RIVER APRIL 2023 Introduction management (eliminating the lift station) and reduce the amount of controlled fill placement required for perimeter berm construction. For the previous design, stormwater discharge from the site was under the exterior roadway, then under the City of Elk River trail, and ultimately to an upstream wetland on property owned by ERL. The modified design allows for discharge directly west of the proposed pond to an existing low area, on property also owned by the Landfill, east of the trail (eliminating the need for the City trail crossing). The proposed sedimentation pond includes settling basins at the east and west ends. A safety bench has been incorporated into the design and perimeter access for cleaning / maintenance activities has been considered. The proposed pond has been designed to provide flexibility depending on mining activities in the area. The bottom elevation of the pond will be at maximum an elevation of 964; the actual elevation may be 964 or lower depending on mining activities. The design presented herein represents the minimum storage capacity that would be provided and storm events that would be managed. Actual conditions following mining activities may provide for management of larger storm events by increasing the available storage capacity. Modifications to the stormwater management system features have allowed for a reduction in the width of the perimeter berm on the south termination of the MSW disposal area. Changes to the perimeter grading plan result in a reduction in fill materials required to complete construction / landfill development. Consistent with the previous design, stormwater generated from the southern portion of the Landfill will still be controlled and routed by drainage terraces, downslope structures, perimeter ditching, and related stormwater management infrastructure. Stormwater will be routed through these features to the proposed large stormwater basin. The modifications to the stormwater management system components on the Landfill will be incorporated during phased closure construction. The modifications to the Landfill discussed above will primarily be on the existing property permitted and approved for Landfill activities and will be addressed in a subsequent minor permit modification application to the MPCA. The current end use plan for the Landfill will not change and provides for open green space. Long term, the open space planned for the site would be compatible with any adjacent future use. The end use determined for the site will be consistent with the terms of previous agreements. �1 1.2 PERMIT APPLICATION TO THE CITY OF ELK RIVER APRIL 2023 Application Requirements 2.1 INTRODUCTION The current Landfill footprint is located within a SWF — solid waste facility overlay district, but the 20-acres of property to the south is not. The additional property is zoned "Agricultural Conservation" and in a Mineral Excavation Overlay District. Although the proposed modifications are for stormwater management improvements, and do not allow for additional waste disposal capacity (the permitted waste limit will remain unchanged), Elk River Code, Chapter 30. Land Development Regulations, Article VI. Zoning, Division 10, Sec. 30-1834.(e) currently restricts solid waste facilities, including all stormwater management facilities, to the SWF — solid waste facilities overlay district. The language in the following portion of the ordinance is proposed to be amended to allow for stormwater management facilities related to the SWF to be located outside of the SWF zoned area. Sec. 30-1834. (e). No solid waste facility, including any portion of a solid waste facility, any easements, water or air rights, all stormwater management facilities and all buffer areas or buffer zones required, needed or useful for the establishment and/or operation of the solid waste facility, with the exception of facilities necessary for monitoring the offsite impacts of the facility on ground and surface water, shall be located or operated in the city except in those areas of the city located within the SWF—Solid waste facilities overlay zoning district. In addition to the ordinance change request, this application is submitted to obtain a sanitary landfill CUP to incorporate the additional area into the property but manage the land under the current zoning designation without expanding the SWF. 2.2 CONDITIONAL USE PERMIT REQUIREMENTS The Elk River Code, Chapter 30. Land Development Regulations, Article VI. Zoning, Division 2. Administration and Enforcement, Subdivision III. Conditional Use Permits, governs the conditional use permit application requirements: Sec. 30-651. Application. (b) An application for a conditional use permit shall be filed with the director of planning on a form prescribed by the city. The application shall be accompanied by such plans and information as may be required by the city, including, without limitation: (1) A site plan drawn at scale showing all abutting lots, existing buildings, existing uses, utilities, curb cuts, and locations of trees having a diameter of six inches ormore. �1 2.1 PERMIT APPLICATION TO THE CITY OF ELK RIVER APRIL 2023 Application Requirements (2) A proposed development plan showing proposed ingress and egress to the prope►ty and proposed structures, yards, off-street parking and loading areas and where appropriate, plans for utilities, screening, buffering, landscape, lighting, signs and open space, and a development schedule. In addition to the information required by Code, the Conditional Use Permit application form requires the submission of the following information: . . . . . Application Fee Full legal description of the subject property (in an editable word format) A typewritten narrative explaining the request in detail Site, Utility, Grading/Drainage Plan Landscape Plan completed by registered landscape architect Drainage Calculations Building Elevations (not applicable) Floor Plans (not applicable) Wetland Delineation / Mitigation Plan (not applicable) EAW/EIS Requirements All other information as determined by City Staff 2.3 APPLICATION FEE The application fees are provided based on the fees itemized on each Application Form. The escrow is used to pay for City's consultants to review the land use applications. If the escrow is used, then the applicant will be billed for all additional services: Application Type �1 Conditional Use Permit Ordinance Amendment Grand Total Fee Escrow $275 $1,000 $275 $1,000 Total $1,275 $1,275 $2,550 2.2 PERMIT APPLICATION TO THE CITY OF ELK RIVER APRIL 2023 Conditional Use Permit 3.1 EXISTING CONDITIONS AND DEVELOPMENT PLAN Per City Code, a site plan showing existing conditions is included in Attachment 3. The proposed development plan for the subject property is included as Figure 3. Development of the stormwater management pond within the subject property will take place as mining activities progress; the exact schedule is dependent on mining operations and soils obtained for Landfill operations and construction. 3.2 LEGAL DESCRIPTION OF THE SUBJECT PROPERTY See Attachment 1. 3.3 PROJECT NARRATIVE A description of the project is provided in Section 1.1. The Conditional Use Permit application form requests additional information for a project narrative. The descriptions are itemized in italics below, followed by ERL's responses. Hours of operation No change is proposed to the current hours of operation. Number of employees The proposed changes will not impact the number of employees required at the landfill. Number of parking stalls (existing and additional) The Landfill employees park their vehicles at the sites' office building located on the north side of the existing Landfill. There are 20 parking stalls located at the office building site as well as ample room for parking in the yard area to the north of the building. No additional parking stalls are proposed as part of the stormwater management system improvements. Is there proposed screening of the site? The proposed Landscape/Screening plan is included in Attachment 2. The plan has been revised from the previously approved screening plan to accommodate the additional land area and grading modifications. Note that trees shown in the Landscape/Screening plan would be installed after waste filling activities in the adjacent landfill area have ceased and final cover construction is complete on the south side of the landfill. Proposed building materials �1 3.1 PERMIT APPLICATION TO THE CITY OF ELK RIVER APRIL 2023 Conditional Use Permit No buildings/structures are proposed as part of the stormwater management system improvements. Signage (how many, proposed sizes, locations, type) No new entrances are proposed for the Landfill and, therefore, new signage will not be required. Outdoor storage (what, how much, proposed screening) No outdoor storage is proposed on the additional property. 3.4 SITE, UTILITY, GRADING / DRAINAGE PLAN The grading and drainage plan for the 20-acre south pond area, including perimeter grading modifications to the southern portion of the Landfill within the previously permitted property boundary, is included as Figure 3. 3.5 LANDSCAPING PLAN The Landscaping/Screening plan for the 20-acre south pond area, including perimeter grading modifications to the southern portion of the Landfill within the previously permitted property boundary, is included in Attachment 2. The plan has been prepared by a registered landscape architect and incorporates a variety of tree types for screening purposes. As previously noted, the plantings shown will be established after final cover is in-place on the adjacent Landfill area. 3.6 DRAINAGE CALCULATIONS Drainage calculations are provided in Attachment 4. The final bottom elevation of the modified / expanded stormwater pond will be dependent on mining activities within the footprint. Based on the maximum bottom elevation of 964 as shown on the grading / drainage plan, the expanded pond will manage the required 25-year, 24-hour storm event as well as larger storm events (with minimal discharge). Discharge from larger events will be retained on ERL property. 3.7 BUILDING ELEVATIONS / FLOOR PLANS Not applicable. 3.8 WETLAND DELINEATION / WETLAND MITIGATION Not applicable. There are no wetlands on the subject property; the property has been and will continue to be mined for sand and gravel resources. �1 3.2 PERMIT APPLICATION TO THE CITY OF ELK RIVER APRIL 2023 Conditional Use Permit 3.9 EAW/EIS REQUIREMENTS The subject property was previously evaluated as part of a larger expanded Landfill footprint that required a mandatory Environmental Impact Statement (EIS) under the requirements of Minn. R. 4410.4400, subp. 13(E). The Draft and Final EIS for the expansion were previously provided to the City. The EIS was completed in 2005 and approved by the Minnesota Pollution Control Agency (MPCA) in 2006. The EIS findings concluded that environmental impacts would likely be minimal, or that adequate mitigation plans were in place to address potential impacts. The proposed stormwater management system improvements do not include any additional waste disposal areas, leachate management system infrastructure, gas system infrastructure, or other related Landfill components that could potentially impact groundwater, wetlands, or air quality, as evaluated in the EIS. 3.10 CONDITIONAL USE PERMIT STANDARDS OF ISSUANCE The Elk River Code, Chapter 30. Land Development Regulations, Article VI. Zoning, Division 2. Administration and Enforcement, Subdivision I I I. Conditional Use Permits, governs the issuance of conditional use permits and establishes the following required findings: Sec. 30-654. Standards for issuance. (a) Required findings. The planning commission shall recommend a conditional use permit and the council shall order the issuance of such a permit only if it finds that such use at the proposed location: (1) �11 not endanger, injure, or detrimentally affect the use and enjoyment of other prope►ty in the immediate vicinity or the public health, safety, morals, comfo►t, convenience or general welfare of the neighborhood or the city. (2) �11 be consistent with the comprehensive plan. (3) �11 not impede the normal and orderly development and improvement of surrounding vacant prope►ty. (4) �11 be served adequately by and will not adversely affect essential public facilities and services including streets, police and fire protection, drainage, refuse disposal water and sewer systems, parks and schools; and will not, in pa►ticular, create traffic congestion or interference with traffic on adjacent and neighboring public thoroughfares. (5) �11 not involve uses, activities, processes, materials, equipment, and conditions of operation that will be detrimental to any persons or prope►ty because of excessive traffic, noise, smoke, fumes, glare, odors, dust, orvibrations. (6) �11 not result in the destruction, loss, or damage of a natural scenic or historic feature of major impo►tance. (7) �11 fully comply with all other requirements of this Code, including any �1 3.3 PERMIT APPLICATION TO THE CITY OF ELK RIVER APRIL 2023 Conditional Use Permit applicable requirements and standards for the issuance of a license or permit to establish and operate the proposed use in the city. ERL has in place an approved sanitary landfill CUP and SWF license. The Landfill will continue to operate as it has in the past, in accordance with City's requirements. The proposed additional land acquired for stormwater management is consistent with the approved CUP for the existing Landfill. Current standards will continue to be met. The stormwater management improvements allow for additional ponding area and open green space. Use at the proposed location meets the requirements itemized above, as presented in this Conditional Use Permit Application document. �1 3.4 CONDITIONAL USE PERMIT APPLICATION TO THE CITY OF ELK RIVER ATTACHMENT 1 Legal Description i�! LEGAL DESCRIPTION That part of the Southwest Quarter of Section 3, Township 33, Range 26, Sherburne County, Minnesota, lying south of the South line of the North 525.00 feet thereof, and lying west of U.S. Highway No. 169; and that part of the Northeast Quarter of the Southeast Quarter of Section 4, Township 33, Range 26, said county, lying south of the South line of the North 525.00 feet thereof, and lying east of the former Great Northern Railroad, all lying south of the following described line: Beginning at the intersection of said South line of the North 525.00 feet with the West right of way line of said U.S. Highway No. 169; thence South 07 degrees 30 minutes 44 seconds East, assuming said South line of the North 525.00 feet of said Southwest Quarter bears South 89 degrees 47 minutes 13 seconds East, a distance of 633.89 feet; thence North 90 degrees 00 minutes 00 seconds West, a distance of 2394.80 feet to intersect the easterly right of way line of said former Great Northern Railroad. And lying north of the following described line: Beginning at the intersection of said South line of the North 525.00 feet with the West right of way line of said U.S. Highway No. 169; thence South 07 degrees 30 minutes 44 seconds East, assuming said South line of the North 525.00 feet of said Southwest Quarter bears South 89 degrees 47 minutes 13 seconds East, a distance of 992.14 feet; thence North 90 degrees 00 minutes 00 seconds West, a distance of 2531.33 feet to intersect the easterly right of way line of said former Great Northern Railroad. 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The previous design included two sedimentation basins and would have required a lift station to manage stormwater from the landfill; discharge was under the exterior roadway, then under the City of Elk River trail, and ultimately to an upstream wetland on property owned by Waste Management. Consistent with the previous design, stormwater generated from the southern portion of the landfill will still be controlled and routed by drainage terraces, downslope structures, perimeter ditching, and related stormwater management infrastructure. Stormwater will be routed through these features to one large stormwater basin as shown on the attached subwatershed map. The proposed larger stormwater basin will allow for on-site control of stormwater, eliminating the trail crossing. The discharge point will be directly west of the proposed pond to an existing low area, on property owned by by the Landfill, east of the trail. HydroCAD stormwater modeling, using the SCS Curve Number method, was used to calculate run-off hydrographs for the final landfill configuration which assumes all landfill areas are closed with the final capping system. To determine surface water run-off for this analysis, the landfill area draining to the southern pond was divided into subwatersheds depending on the contributing drainage areas. Subwatershed areas are shown on the attached figure. Model inputs were consistent with the previously completed modeling for the site. Run-off curve numbers of 77, 80, and 98 were used for the landfill top, sides and ponded water in the sedimentation basin, respectively. Perimeter areas were assigned curve numbers of 55 (woods), 69 (fair grass cover), and 81 (developed urban industrial area) depending on existing or expected condition at the time of final closure of the current MSW disposal area. Time of concentration was computed within the HydroCAD model based on the characteristics of each subwatershed (i.e. hydraulic distance and slope). Peak flows from the subwatersheds were calculated for the 25-year and 100-yr 24-hr storm events based on NOAA Atlas 14 precipitation frequency estimates for the site. • 25-year, 24-hr = 5.19 inches • 100-year, 24-hr = 6.86 inches Runoff-calculations were used to size the various components of the surface water management system routing drainage to the south stormwater basin. Landfill development is in progress and currently Cell 20 Phase 3 is planned to be constructed in 2023. The drainage area contributing runoff to the pond will depend on waste filling activities and final cover construction; with the ultimate drainage area realized at the time of final closure of the currently permitted MSW disposal area. Prior modeling completed for the site included open channel flow within the landfill footprint. The re-design project modeling has incorporated a piping network. MPCA solid waste rules require management of the 25-year, 24-hr storm as the minimum design storm event. For the purposes of the southern pond re-design project, piping has been sized based on the 100-year, 24-hr storm event. Actual materials used for downslope structure or other infrastructure construction may vary; open channel flow or piping networks may be utilized for drainage. At minimum, the 25-year 24-hour storm event will be considered during construction level design/implementation. April 21, 2023 Elk River Landfill Page 2 of 2 Reference: South Stormwater Pond The southern stormwater basin was designed to provide flexibility depending on mining activities in the area. The maximum bottom elevation of the pond will be at an elevation of 964; the actual elevation may be 964 or lower. Modeling assumed a bottom elevation of 964 with two deeper settling basins at the east and west ends of the pond, as shown on the drainage map. A safety bench has been incorporated into the pond design and perimeter access for cleaning / maintenance activities has been considered. A 5:1 slope on the north side of the pond was implemented to visually change the slope and allow for additional landscaping. Based on site soils, it is anticipated that infiltration will take place within the pond footprint. However, to be conservative, no infiltration was assumed in the stormwater model. The stormwater basin includes an outlet culvert at an elevation of 967.5'. Since it is anticipated that infiltration will occur (onsite soils are HSG A/B soils) the outlet culvert will serve as an overflow mechanism, rather than a typical pond outlet structure. As another conservative design measure, the model assumes that run-off from a 25-year, 24-hr storm event is in the pond at the start of the modeled storm (�2.0 feet of water within the pond). If stormwater does discharge through the outlet culvert, stormwater would flow through the pipe to an existing wooded, low-lying area directly west of the pond footprint. The overflow elevation of this low-lying area is 969.5; the area was included in the modeling to confirm that discharge will remain on Landfill property for the design storm events. Incorporating the shallowest anticipated pond grades into the model, results indicate that the 25-yr and 100-yr storm events will be managed with no off-site discharge. The 100-yr event includes nominal discharge to the low-lying area onsite. Excavation below the grades shown would result in more ponding capacity and the capability to manage even more extreme storm events with no discharge from the Landfill property. A summary of the pond performance for the modeled storm events is included below: Storm Event 25-yr 100-yr Pond Peak Water Elev. 967.88 968.66 Pond Discharge (cfs) 0.00 0.34 Low Area Peak 968.58 969.34 Low Area Discharge (cfs) 0.00 0.00 Stantec Cansulting Services Inc. Attachment: Subwatershed Map u:\2277058701technical\south_stormwater_pond\cup\attachment 4- drainage calculations\stormwater write-up.docx CONDITIONAL USE PERMIT APPLICATION TO THE CITY OF ELK RIVER FIGURES Figure 1 — Site Map Figure 2— Site Development Plan Figure 3— Grading and Drainage Plan i�! _� : 3 ' L2g211d �w'�,'�'� r'� ��e .� � z r� y rL'�a� , 3. � x. `�y,._. �0034-�.0 �,.u< . � y � T � "�_ � `� r �, � ` 'g Previous Elk River � F'b � L '� .� � ` . � Landfill Boundary � ,� �'� �� _ . � � � ' -�i .. �1r i: . 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' �, , ,. � � ,�,��'�,. ,; • � s � Ell� R�iver Lar�dfill Ca�e No: �A 23-42 . . cu 23-og �Ei� - - Cor�ditiona�l Us� Perr�lt Riv�r - Back rou nd g �� ■ Proposed ordinance language would allow for landfill stormwater ponds to be located outside of the Solid Waste Facility overlay district CUP ■ Applicant purchased 20-acres ■ Update stormwater management infrastructure ■ No additional Municipal Solid Waste capacity (no landfill expansion) Section 30- I 834 �e} 5a�6d �►�va�s#�e �cr�rlr'ti�s restt�rc�ed ta SUVF—.�c�fid �cr��e �a�ci�rties c��rer�ay d�s�r�ct. No salid v�+�ste ��cility, includin� �ny p�rtian of ��olid wast� f��ility, an�r e��em�r�t�, vuater �r air ri�hts, ��� �'tnrrrst��^�tc�r ����� ���Tt��nd �II buffer �r�as or buffer z�n�s r�+quire�, needed or u�eful f�or th� est�bli�hment �nd/ar oper�tian of the sali�d �r�s�te facility, with �h� exce�tion a� f�cili��ie� nec�e�s�r�r fcar m�rt��torin� th� affsit� imp�cts �f ti�e ��crlity c�n �raund �nd surfiace �rater, sh�all b� Ic�c�ted ar aperat�e� in t�� city ex�ept in thos� ar�a� c�fi the city I���ted withir� th� S1NF—Salid �rv:�ste facili�i�s �verl�y z�nir�� district. 5tarr-r�v�r�t�r facilities servin� a�pro��d S�+VF f��ilities ma� b�e loc�ted outside �f the �WF overl�� district if an ��anin� L�rt �directly� at�utting the praperty crf the apprarr�ed use�. � � �' . f,�x�;��Q���, . ; � �. -� r� �� „�� �� � C . � . ..; i . , a � : �is. ,' � . . ' Y , � '� 1y�. 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PHENOUBLNVOFlLL ; �� T �-. f- . � --- -`' �.—�_. � ,+ �Z ,.gi� PROPERIYBOUHQYiY ; / / C "�. � ���� ;� �f s, 4�iq f�e P ."� / ' , � � �� f � � i I ��. J C� !' ,\ ` . _ . _ � ` ' �-�� � .,-- � � w � � �` 1 . ! � � 9 � � � r ` _ ��-2 r � 1 \ `� � � ��� + o�� t�����,� i,� �—� , ,� � _� .. � =��, � �i �� \� � ;, ► . �. / e A � sou�+s QiMEnTn�r� eario � r � 1 ��� . �� �� � r � � '1 _ �i � .. _. _. � \ � \ � . . -;� , , ,� . � e r � � � � �om���LL � � . . _ . '� ' l . , , _ , �� � P����� � �� � � , , , �� _ . " .. , . ,. . i i .+., _ � ._. � J.. � � , � . . . .. , . -. : - .• ., . . , , _. - , - . .. . . , ._ � - - �.�' ,f - � - _ , . .,. : . _ '� _ _ - - � - - - - _ _ _ _ �t`, � �_ ' . _, _ �. - ,. _ - — . � .:. �... • . . � .. .� � T . . .... C , ..� . . .. . .. , ' . - -. � . , . ', , �.. _... . . . .. . . .... , '., � : , . . i i ; .\ / _ . . • i . ..'�.��. .� �, /-�.i � 1 � , .-,i..-.�� I .'.4 1 i��1i �_ �_.1, " C V P Re u i rements q ■ PC analysis of the application shows compliance with all seven (7) of the standards required for approval of the CUP ■ Two conditions are being proposed ■ Amended agreement required ■ No additional Municipal Solid Waste capacity beyond what was approved in 2011 Plannin Commission g ■ During the public hearing, no one spoke for or against the request and staff has not received any comments since the commis sion meeting. ■ The Planning Commission had no questions or concerns about the request and unanimously recommended approval. Action Re uested q ■ Adopt, by motion, an Section 30-1834 SWF ordinance amending City Ordinance solid waste facility overlay district ■ Approve, by motion, the CUP with the two conditions outlined in the memo