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8.2. SR 11-03-2014 City of Elk - Request for Action River O. To Item Number Mayor and City Council 8.2 Agenda Section Meeting Date Prepared by Work Session November 3, 2014 Suzanne Fischer,Director, CODD Item Description Reviewed by Rivers Edge Commons Park Paver Project Tim Simon, Finance Director Reviewed by Cal Portner, City Administrator Action Requested Informational. Background/Discussion In 2007,pavers were installed at the crosswalks of Main Street and Jackson Avenue and on the alley adjacent to Rivers Edge Commons Park. Unfortunately, the pavers were from a defective batch and have prematurely deteriorated. They require replacement for aesthetic and safety reasons. The city has received numerous complaints on their unsightliness and the uneven surface increases the city's liability if pedestrians trip and fall. The supplier,Borgert Products, Inc.,has agreed to donate permeable pavers for the crosswalk and alley sites. The city would be responsible for site demolition and aggregate base work. Permeable pavers are increasing in popularity due to their ability to reduce stormwater runoff. This attribute also supports a best management practice required by the city's stormwater permit. Installing permeable pavers would address the concerns of aesthetics, safety, and stormwater control simultaneously. Restoration options reviewed at the November 3, 2014,work session: 1. Install pavers at crosswalk and alley 2. Install pavers at crosswalk,upper and lower parts of alley, and asphalt midsection of alley 3. Install pavers at crosswalk and asphalt alley 4. Asphalt crosswalk and alley Bolton-Menk quoted engineering design services for the alley at $28,080. This would include stormwater runoff calculations and construction specifications. Executing this agreement would be the initial step of the project. Financial Impact N/A Attachments • PowerPoint • Bolton-Menk Quote P a w E A E U a r Template Updated 4/14 INIM UREI River's Edge Commons Park Paver Proj* ect City Council Meeting Nov. 3 , 2014 Elk - - - _ - � r4jAl � U�River History of Park ■ Constructed in 2007 • Plaza • Fountain • Amphitheater • Gazebo • Scenic view • Pavers Park Background • Downtown Destination • Concerts • Weddings • Holiday events • Kids play • River Connection ■ Powered by Nature theme h Concerns • Alley and crosswalks • Retaining wall • Limited sightlines • Limited seating • Stormwater runoff .......... N!f ZM h - ♦ F Alley and Cross Walk Pavers • Pavers installed ~ 2007 • Defective and prematurely deteriorated • Need replacement • Borgert donating permeable pavers for site h i r t a U ver �1 •t. OV ji River - - - - - - � -- - Crosswalk and Alley Pavers , • Borgert provided specs for crosswalk • Alley requires engineering design • Stormwater runoff control • Bolton-Menk quote $28,,080 h • ' I a � fR Ems SES r � 0 2014 G¢agae Goosz earth '-Z Imagery Date: 9/15/2013 45x15'10.19" N 93c:34'05.59" VV elev 892ift eye alt 1282 ft C} Option Pavers in crosswalk and alley 1 . Engineering Services for design $28,080 2. Pavers Donated 3. Demo and aggregate base TBD 4. Installation Donated h • • • • f • f • I f #�I w dr e r � 02014C;o gae Goosz I earth ' Imagery Date: 9/15/2013 45x15'10.19" N 93c:34'05.59" VV elev 892ift eye alt 1282 ft C} Option 2 • Crosswalk Pavers • UpperAlley Pavers • LowerAlley Pavers • Alley Midsection in Asphalt — Engineering Services for design $28,080 — Pavers Donated — Demo and aggregate base TBD — Asphalt midsection $9,400 h l dog ■ RES Y' am ok OL tq r- a Y r �■��ii i t W4. P Imagery Date: 9/15/2013 45E18'10:14" N 93°34'd '-'L'd elev 892--ft eye alt 1282 ft Option 3 • Pavers at crosswalk Donated - Demo and aggregate base TBD • Asphalt alley X22,500 • Downtown beautification goal not supported • Reduced life expectancy (asphalt vs. pavers) • Reduced stormwater runoff control h • • • • d d • Ao + 4� s - *o_. OL k u�, 2 P 0 2014 Gaagle O - I earth Ima°gera+ Date: 9/15/2013 45E18'10.19" N 93°34'd : '-'L'd elev 892--ft eye alt 1282 ft Option 4 • Asphalt crosswalk and alley — Crosswalk $6!0000 — Alley $22!0500 • Downtown beautification goal not supported • Reduced life expectancy • No stormwater runoff control MOM-11110W Wmipm OW—P h Funding • Downtown Restoration — The Pavement Management Fund — Stormwater Funds • Pursue CWA funds in 2015 for future projects • Need Council direction on how to proceed h t But wait . . There 's morel, r MONS Other Needs: Replace retaining wall =— Move/Transplant trees Stabilize bank for seating � - _ a ■ nddo AL At Goog "' earth N . Nv°W N+ws Wh.A�s°+w�✓+ NtiA NNE NN�:'�NNtf+ a+w�a"�mi ✓�w,r�n,n ..:..nom tiFerWtiPY`. Other Site Restoration Needs • Retaining wall — Safety concern • Park sightline improvements — Transplant trees • Passive seating improvements — Bank stabilization • F==t(Z> TON M F:== N K , I NC® Consulting Engineers & Surveyors j1 7533 Sunwood Drive NW• Ramsey, MN 55303 Phone(763)433-2851 • Fax(763)427-0833 www.bolton-menk.com October 28, 2014 Justin Femrite,PE City Engineer 13065 Orono Parkway Elk River,MN 55330 RE: Rivers Edge Commons Park Permeable Paver and Water Quality Improvements City of Elk River,Minnesota Dear Mr.Femrite, Bolton&Menk, Inc.is pleased to present this scope of services and associated fees for the conversion of the alley way leading to Rivers Edge Commons Park to permeable pavers and analysis of the drainage area for water quality improvements. We understand the City has coordinated with the original paver supply company and has negotiated replacement of the deteriorating pavers in the alleyway with a permeable pavement system. While grades along the alley corridor are relatively steep, we believe that we can design a system that: 1) Captures stormwater runoff on grade to reduce the total volume and flow rate at the end of the street. 2) Filters and stores polluted stormwater runoff promoting an increase in water quality entering the river. 3) Utilizes the flatter grades at the south end of the alley to filter and treat stormwater runoff from a highly impervious watershed. This proposal defines our scope of work and associated fees in a task oriented format. The scope includes analyses of the watershed and the applicability of a stormwater treatment system, design plans and specifications, and project management to ensure a collaborative effort with the City and that project milestones are met. If this proposal is acceptable and you wish to proceed, we will begin work immediately. Please feel free to contact me if you have any questions or if you require any additional information. Sincerely, BOLTON&MENK, INC. Cody Holmes,PE Project Manager Enclosures: Scope of Services Estimated Hours and Fees Rivers Edge Commons Park Alley Improvements 10/28/14 O Page 2 SCOPE OF SERVICES On October 23rd, 2014,Bolton&Menk staff met with City staff on site to review the current paver issues, discuss site constraints, and brainstorm ideas for water quality retro fits. Porous pavers will be installed with an integrated filtration/infiltration subgrade system. The slope of the alley from Main Street to the River will be a challenge, especially if filtration/infiltration is utilized along the entire slope. Bolton& Menk has prepared the following scope of services and associated fees to analyze the watershed, determine the expected improvements in water quality,recommend alternatives, and prepare design plans. TASK 1 - DEVELOP DRAINAGE AREAS AND ANALYZE WATER QUALITY Task 1.1—Delineate Watersheds Bolton&Menk will utilize Light Detection and Ranging(LiDAR)topographic information to delineate watersheds contributing stormwater runoff to the River Edge Commons Park alley. We will utilize City storm sewer information to determine the total flow entering the local drainage network. Also, local knowledge and site visits will be utilized to determine the location and contribution of roof drains. Task 1.2—Develop Watershed Characteristics and Hydraulic Model Once watershed areas are determined, Bolton&Menk will develop a preliminary hydraulic model to determine the total surface runoff to the alley based on watershed characteristics (e.g. Curve Number and time of concentration). Soil properties will be analyzed utilizing the National Resources Conservation Services (NRCS) soils information and any available soil boring data in the area to determine the hydraulic soil group and preliminary infiltration rates. These properties will ultimately be used to determine the potential volume reduction capacity of the proposed system. Task 1.3—Calculate Theoretical Pollutant Loadings Watershed calculations will be used to determine theoretical pollutant loadings based on design recommendations from the Minnesota Pollution Control Agency(MPCA),the Minimal Impact Design Standards (MIDS), and the Minnesota Stormwater Manual. This includes theoretical pollutant loading assuming an Event Mean Concentration(EMC)for total phosphorus (TP)and total suspended solids (TSS) for specific combinations of hydraulic soil group, land cover, and percent imperviousness. While these values are theoretical,the results will provide us an idea of the extent of pollutant loading in the area as well as an apples-to-apples comparison of the anticipated removal efficiency of the proposed water quality system. Bolton& Menk will analyze the proposed pollutant loading and provide recommendations to the efficacy of a water quality system. If the anticipated pollutant loading is relatively negligible relative to the City's overall water quality goals,it may be worth utilizing funds in areas where water quality treatment will have a larger impact. If so,it may be more prudent to augment the pervious paver system to focus on volume control only. We will not proceed to Task 2 until the preliminary water quality results are presented to the City. Rivers Edge Commons Park Alley Improvements 10/28/14 O Page 3 TASK 2 - DEVELOP PRELIMINARY WATER QUALITY IMPROVEMENTS Task 2.1—Develop Water Quality and Volume Control Options Once the theoretical pollutant loading is developed and the efficacy of a water quality and volume control system is determined, Bolton&Menk will be begin developing preliminary design options. The options will incorporate pervious pavement and an underdrain system that focuses on filtration and/or infiltration of stormwater to maximize pollutant removal and runoff volume reduction. The system will also incorporate high flow control structures and emergency overflows that tie into the existing drainage system and follow overland routes that minimize erosion and protect public safety. "On-grade"options will be considered in the higher sloped, north end of the alleyway. It is anticipated that traditional subgrade and drainage for pervious pavement will be difficult to employ and alternative methods will be necessary. Also, the flat area at the south end of the alley will utilized to the fullest extent to treat runoff from the highly impervious watershed. Task 2.2—Analyze Anticipated Pollutant Removal and Volume Reduction Each preliminary design option will include an analysis of the theoretical pollutant removal based on the loading calculations in Task 1. MtDS will be used to model the proposed option for TP and TSS removal. The hydraulic model will be utilize to determine anticipated volume reductions, analyze the impacts to the existing storm sewer system, and develop overland flow routes for larger rainfall events. Task 2.3—Summarize Preliminary Design Options The preliminary design options will be presented to the City, and additional options analyzed or refined based on City recommendations. Once the preliminary options are agreed upon,Bolton&Menk will summarize the options and the water quality and rate control outcomes in a report. We will also make recommendations for final design. TASK 3 - DESIGN PLANS AND SPECIFICATIONS Task 3.1—Develop Design Plans and Project Specifications Once the City and Bolton&Menk have agreed on a final design option, design plans and project specifications will be developed. We anticipate using Autodesk Civil 31)to develop plan sheets that meet City plan standards,including effective erosion and sediment control and City construction details. We will present preliminary design plans to the City at the 60% and 95% development stages for review. All comments and design modifications will be incorporated into the final plan set. TASK 4 - CONTRACT BIDDING AND AWARD Task 4.1—Prepare Contract Bidding and Award Bolton&Menk will prepare,if necessary, opinion of cost, advertisement for bids, answer bidder's questions,issue addenda, and assist with bid opening and prepare letter of award. If advertisement is not necessary, quotes will be solicited from multiple contractors. Rivers Edge Commons Park Alley Improvements 10/28/14 O Page 4 FEES The Schedule of Fees is a breakdown of tasks,hours and rates for services to be provided on this project. Based on the proposed scope of services and hourly task analysis, we propose the following fees for services. City of Elk River PROJECT: Rivers Edge Commons Park Water Quality BOLTON Improvements tA „ v v °0 i a, °J Total Total TASK NO. WORK TASK DESCRIPTION o c o 3 E �+ .� Cco ? ° o Hours Cost d G W W 1.0 Develop Drainage Areas and Analyze Water 0 6 22 28 $2,420 Quality 2.0 Develop Preliminary Water Quality 8 80 50 138 $13,760 Improvements 3.0 Design Plans and Specifications 10 30 60 100 $9,300 4.0 Contract Bidding and Award 15 0 10 25 $2,600 TOTAL HOURS 33 116 142 291 AVERAGE HOURLY RATE $120.00 $110.00 $80.00 SUBTOTAL $3,960 $12,760 $11,360 TOTAL PROJECT FEES-HOURLY NOT TO EXCEED $28,080 We appreciate the opportunity to provide you with this scope of services.If you have any questions regarding this proposal,please feel free to call Cody or Tim Olson.