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HomeMy WebLinkAbout6B SWMO Grant Water Reuse at Ponds ParkU 4646 Dakota Street SE ` Prior Lake, MN 55372 CITY COUNCIL AGENDA REPORT MEETING DATE: JANUARY 3, 2010 AGENDA #: 66 PREPARED BY: ROSS BINTNER, WATER RESOURCES ENGINEER PRESENTER: ROSS BINTNER, WATER RESOURCES ENGINEER AGENDA ITEM: CONSIDER APPROVAL OF A RESOLUTION ACCEPTING SCOTT WATERSHED MANAGEMENT ORGANIZATION ( "SWMO ") GRANT TO CONSTRUCT A WATER REUSE SYSTEM AT THE PONDS PARK ATHELETIC COMPLEX. DISCUSSION: Introduction The purpose of this agenda item is to request that the City Council authorize receipt of a grant from the SWMO and authorize staff to construct the proposed water reuse system. History The Ponds Park Athletic Complex has six lighted softball fields and four soccer fields that are very heavily used. To keep the fields safe for its users, intensive turf management is performed by parks staff. Fertilizer use, aeration, mowing and a spray irrigation system keep the turf growing through adverse conditions. In 2009, over three million gallons of irrigation water was used at the Pond Park alone. While irrigation is essential to maintain the turf level of service, using the municipal water supply to irrigate fields has potentially serious environmental and fiscal trade -offs including municipal water production and distribution system costs, pumping and treatment operation costs, and drawdown of the groundwater aquifer. Using the municipal water supply for irrigation also presents similar water quality and quantity risks associated with urban development with increased water and pollutant loading flowing to downstream wetlands, lakes and rivers. Runoff from the Ponds Park area and nearby neighborhoods flows into a chain of created stormwater ponds and natural wetland systems. Runoff then flows to Cleary Lake, which is a water body impaired by excess nutrients, then into the rate and volume sensitive Credit River system, and then into the Minnesota River. While flowing to the Credit River, runoff from the Ponds Park and nearby neighborhoods also flows into and through the City of Prior Lake Wellhead protection area where pollutants associated with runoff create risk to the water supply. Source controls for the wide variety of urban pollutants that can cause risk to health, safety, property or the environment is often the best and cheapest way to reduce risks. Well- informed operation of physical infrastructure is also an important tool. Other metro area communities are experimenting with water reuse systems, irrigating public right of ways, road boulevards, and public parks including examples from the Village of St. Anthony, Roseville, and Lakeville. Current Circumstances The SWMO has awarded the City of Prior Lake a grant of $31,993 for construction and initial study of a water reuse system at the Ponds Park Athletic Complex. The proposed system would disconnect three of the 10 fields, reducing use of the municipal water supply by around 900,000 gallons per year. In its place, a system would be created to use near surface groundwater, and surface water from a nearby wetland to irrigate the three fields disconnected from the municipal water source. Surface water reuse is a relatively new technology for municipalities, but it is used extensively in the golf course industry and overseas. The Ponds Park project will be paired with a risk assessment process and grant study to assist City staff in implementing the project in a way that minimizes potential risks and quantifies the environmental benefit. The study will include an analysis of the cost and benefit. The grant project also includes innovative uses of existing technology. The irrigation system will have a peak pump rate dampening cistern and two different filtered water sources. One of the filtered water sources products comes from Midwest Floating Islands LLC, and is described in greater detail in an appendix. Midwest Floating Islands has also offered to donate 75% of their product cost, equating to a donation value of $3,930.00. The grant project includes a second, informal donation as well. As part of a risk assessment and management process, staff will invite a variety of technical and regulatory experts to sit on a technical advisory group that will review the work of and inform the project as the risk assessment and benefit studies progress. A preliminary list of experts invited is included in the risk management document exhibit attached to this report. Three exhibits are attached: the grant application and documents used at the SWMO consideration of the application, a draft of the risk assessment and management plan, and a description of the floating island filtration system and contribution from Midwest Floating Islands. Each exhibit reinforces how City staff plans to implement innovative surface water reuse technologies in a way that is mindful to both risks and benefits of the practice. Conclusion Careful implementation of innovative practices both expands and diversifies the set of tools that municipalities have at their disposal to meet the difficult challenges in the management of water resources. ISSUES: Grant funding from the Scott WMO will provide a little less than half of the total cost of the project. The rest of the project costs come from 2010 -2012 water quality utility, capital improvement, parks budgets and private donations. The project cost includes $46,585.50 for capital improvement and $24,140.00 for study and risk assessment for a total of $70,725.50. The project cost estimate is detailed in the SWMO approval documents exhibit. 2 FINANCIAL Total City costs of $38,732.50 break down as follows: $20,348.38 Total IMPACT: Cash and $18,384.12 value of labor (estimate included overhead). Cash: $10,000.00 from 2010 Water Quality Fund for capital improvement (602- 49420 -530). $8,700.00 from 2010 -2012 Water Quality Fund for testing (602- 49420 -314). $1,648.38 from the 2011 Parks Budget for capital improvement (101- 45200 -530). Labor: - 398 hours from the 2011 Parks Budget for in -kind staff effort (101- 45200 -101). - 100 hours from 2010 -2012 Water Quality Fund for in -kind staff effort (602- 49420 -101). ALTERNATIVES: The alternatives are as follows: 1. Accept the grant from the Scott WMO and donation from Midwest Floating Islands. 2. Table this item for a specific reason. 3. Deny this agenda item for a specific reason and provide staff with direction. RECOMMENDED Alternate 1 MOTION: A i*Ler 3 f.� PRIp� U trf 4646 Dakota Street SE soz Prior Lake, MN 5 53 72 RESOLUTION 11 -xxx A RESOLUTION ACCEPTING SCOTT WATERSHED MANAGEMENT ORGANIZATION ( "SWMO ") GRANT TO CONSTRUCT A WATER REUSE SYSTEM AT THE PONDS PARK ATHLETIC COMPLEX. Motion By: Second By: WHEREAS, MN Statute 465.03 requires that cities accept donations for the benefit of its citizens in accordance with the terms prescribed by the donor; and WHEREAS, The Scott Watershed Management Organization has approved innovative water management grant funding for this project totaling $31,993.00; and WHEREAS, Midwest Floating Islands, LLC. has donated products used in this project estimated at $3,930 in value; and WHEREAS, The City of Prior Lake will constructed a water reuse system at the Ponds Park Athletic Complex, conduct a risk assessment and management planning exercise, and study system cost and benefit. NOW THEREFORE, BE IT HEREBY RESOLVED BY THE CITY COUNCIL OF PRIOR LAKE, MINNESOTA as follows: 1. The recitals set forth above are incorporated. herein. 2. The City of Prior Lake accepts a grant from the Scott Watershed Management Organization in the amount of $31,993.00. 3. The funds shall be deposited in the Water Quality Fund (602- 33533). 4. Project funding shall come from Accounts # 602- 49420 -530 & 101 -45200 -530. PASSED AND ADOPTED THIS 3rd DAY OF JANUARY, 2011. YES NO M ser M ser Erickson Erickson Hedberg Hedber Keeney Keene Soukup Souku Frank Boyles, City Manager AGENDA SCOTT COUNTY BOARD OF COMMISSIONERS SHAKOPEE, MINNESOTA NOVEMBER 30, 2010 9:00 a.m. (1) CONVENE COUNTY BOARD (2) AMENDMENTS TO THE AGENDA (3) APPROVE MINUTES OF NOVEMBER 23. 2010 COUNTY BOARD MEETING (4) RECOGNITION OF INTERESTED CITIZENS Limited to 5 minutes per person /subject. Speakers are asked to approach the microphone for the benefit of viewers and interested citizens. (5) CONSENT AGENDA Create Safe, Healthy, and Livable Communities 5_1 Approve Receipt of Grant Funding From the Minnesota Department of Human Services for the Parent Support Outreach Program 5_2 Approve New Agreement Between Scott County and Hennepin County Metropolitan Health Plan 5_3 Approve Cooperative Agreement With Anoka, Carver, Dakota, Hennepin, Ramsey, Scott, and Washington Counties for Children's Mental Health Crisis Services 5_4 Approve Application to Sell 3.2 Malt Liquor at Retail for 2011 5_5 Approve Charitable Gambling Application and Waive 30 Day Waiting Period for Ducks Unlimited MN Chapter 330 5_6 Adopt Resolution No. 2010 -142; Approving the Joint Powers Agreement Providing for the Joint Financing of Library Facilities with the City of Elko New Market 5_7 Adopt Resolution No. 2010 -133; Authorizing Final Payment to Chard Tiling & Excavating, Inc., in the Amount of $1,000 for the County Highway 7 Bridge Replacement Projects Located in Belle Plaine Township 5_8 Adopt Resolution No. 2010 -135; Authorizing Entering Into a Cooperative Agreement With Sand Creek Township to Provide Engineering Services and Construction Contract Administration for TSC -173 5_9 Adopt Resolution No. 2010 -137; Approving the Trunk Highway 169 at County Highway 3 Grade Separation Report 5.10 Adopt Resolution No. 2010 -138; Approving the 1 -35 and County Highway 2 Interchange Footprint Study 5.11 Adopt Resolution No. 2010 -139; Authorizing Amendment No. 2 to the Agreement With Prior Lake Aggregates, Inc., LLC 5.12 Adopt Resolution No. 2010 -140; Certifying Final Approved Appraisal of Value for Certain Land Acquisitions and Authorizing Said Acquisitions by Expedited ( "Quick Take ") Eminent Domain Proceedings Associated With Bridge Replacements and Reconstruction of County Highway 23 at County Highway 56 5.13 Adopt Resolution No. 2010 -141; Certifying Final Approved Appraisal of Value for Certain Land Acquisitions and Authorizing Said Acquisitions by Expedited ( "Quick Take ") Eminent Domain Proceedings Associated With the Reconstruction of County Highway 27 and County Highway 44 — Phase 1 5.14 Approve Appraisal Reports' Estimate of Just Compensation by a Market Value Appraisal for New Right -of -Way for the Reconstruction of the County Highway 68 (Credit River Boulevard) and County Highway 91 (Vernon Avenue /Natchez Avenue) Intersection as a Roundabout in Credit River Township 5.15 Approve Application and Award Watershed Management Organization Cost Share Funds for Terrance and Melissa Schwartz (Prairie Hogs, Inc.) in the Amount of $4,611 5.16 Approve Application and Award Watershed Management Organization Cost Share Funds for Eileen Latterell in the Amount of $25,809 5.17 Approve Application and Award Watershed Management Organization Cost Share Funds for Allen and Sharon Schmitz in the Amount of $3,000 Develop Strong Public Partnerships and an Active and Informed Population 5.18 Adopt Resolution No. 2010 -136; Authorizing Entering Into Cooperative Agreements With the Cities of Belle Plaine, Elko New Market, Prior Lake, Savage and Shakopee, Shakopee Public Utilities Commission and Shakopee Mdewakanton Sioux Community (SMSC) for Cost Sharing of Aerial Photography Manage the Challenges and Opportunities Derived From Growth and Development 5.19 Adopt Resolution No. 2010 -130; Appointing the Special Board of Appeal and Equalization, Adopting Procedural Rules and Compensation, and Establishing the Board Code of Ethics and Conduct Guidelines 5.20 Approve the Request for Conditional Use Permit of Drews Concrete Inc. in Section 21 of Louisville Township 5.21 Approve Amendment to the Electronic Mailbox Management Policy to Increase the E -Mail Archiving Time from 30 Days to 60 Days Provide a Supportive Organizational Culture Which Enhances the County Mission 5.22 Adopt Resolution No. 2010 -128; Appointing James L. Hentges as County Recorder /Registrar of Titles Effective December 1, 2010 5.23 Adopt Resolution No. 2010 -127; Reappointing Michael J. Thompson as County Assessor Effective December 1, 2010 for Completion of the Four -Year Term Ending December 31, 2012; and Rescinding Resolution No. 2009 -175 5.24 Approve Personnel Actions (6) CREATE SAFE, HEALTHY, AND LIVABLE COMMUNITIES 6_1 Information Presentation on the Family, Adolescents, and Children Therapy Services (FACTS) 6_2 Approve an Application and Award Watershed Management Organization Innovative �c Cost Share Funds to the City of Prior Lake in the Amount of $31,993 for the Ponds Park Athletic Complex — Stormwater Reuse System 6_3 Approve Amendment 1 to the Contract With the Minnesota Pollution Control Agency Changing the Final Product From a Total Maximum Daily Load Study to a Protection Plan for the Credit River and Extending the Contract to March 1, 2011 6_4 Adopt Resolution No. 2010 -132; Awarding Contract to Rachel Contracting for the Picha and Porter Creek Stream Reconstruction and Restoration Project in the Townships of Louisville and Cedar Lake (7) SUSTAIN THE COUNTY'S EXCELLENT FINANCIAL HEALTH AND ECONOMIC PROFILE 7_1 Approve a Three Year Contract Renewal With Lawson Software Americas, Inc. for the Hosting of the Financial, Human Resources and Payroll Applications (8) COMMITTEE REPORTS AND COMMISSIONER UPDATES (9) COUNTY ADMINISTRATOR UPDATE (10) NEW & UNFINISHED BUSINESS (11) RECESS FOR ATTORNEY /CLIENT MEETING (12) ADJOURN FOLLOWING THE BOARD MEETING, THE COMMISSIONERS WILL CONVENE IN A WORKSHOP SETTING REGARDING THE FOLLOWING TOPICS: • SOLID WASTE PLAN UPDATE PROCESS AND HOUSEHOLD HAZARDOUS WASTE OPERATIONS FOR 2011 • TRANSPORTATION IMPROVEMENT PROGRAM • THREE RIVERS PARK DISTRICT DRAFT AGREEMENT 'PC 'MEE -TIN - �U December 7, 2010 December 14, 2010 December 21, 2010 December 28, 2010 No Board Meeting County Board Meeting County Board Meeting No Board Meeting Gary L. Shelton County Administrator (952) 496 -8100 AGENDA #6.2 SCOTT COUNTY, MINNESOTA REQUEST FOR BOARD ACTION MEETING DATE: November 30, 2010 ORIGINATING DIVISION: ORIGINATING DEPARTMENT: Community Development Natural Resources CONSENT AGENDA: r Yes Iw No PRESENTER: Paul Nelson ATTACHMENTS: r Yes r No PROJECT: Scott WMO Cost Share Program TIME REQUESTED: 10 minutes ACTION REQUESTED: Approve an Application and Award WMO Innovative Cost Share Funds to the City of Prior Lake in the Amount of $31,993 for the Ponds Park Athletic Com lex — Stormwater Reuse System. CONTRACT /POLICY /GRANT: r' County Attorney Review r Risk Management Review STRATEGIC INITIATIVE: r Create Safe, Healthy, and Liable Communities r,/ Develop Strong Public Partnerships and an Active and Informed Population r Provide a Supportive Organizational Culture Which Enhances the County Mission ly Manage the Challenges and Opportunities Derived From Growth and Development I' Sustain the County's Excellent Financial Health and Economic Profile DEPARTMENT /DIVISION HEAD SIGNATURE: COUNTY ADMINISTRATOR SIGNATURE: Approved: DISTRIBUTION /FILING INSTRUCTIONS: Denied: Paul Nelson, Natural Resources Program Manager Melissa Bokman, Sr. Water Resources Planner Ross Bintner, Water Resources Engineer, City of Prior Lake Susan McNellis, Scott WMO Legal Council Michael Sobota, Community Development Director Tabled: Other: Deputy Clerk: Date: RBA #: 2010 -416 Background /Justification: The purpose of this agenda item is to approve an application and award Scott WMO innovative cost share funds to the City of Prior Lake in the Amount of $31,993 for the Ponds Park Athletic Complex — Stormwater Reuse System. A copy of the proposal for this project is attached. The Scott WMO provides cost share for innovative practices that introduce new technologies or that address areas of emerging concern. The City of Prior Lakes proposal for the Ponds Park Athletic Complex — Stormwater Reuse System tests new technology (e.g., stormwater reuse) as well as addressing an emerging concern regarding groundwater overuse in this area. The project proposes to reuse stormwater for irrigating athletic fields in the park reducing groundwater use. Other potential benefits include reducing nutrient (fertilizer application), and nutrient loading to downstream waterbodies. Cleary Lake located downstream of the project area is considered impaired due to excessive nutrients. The proposal also includes efforts for evaluating and assessing the project. The proposal was considered by the Watershed Planning Commission at their October 2010 meeting. The Watershed Planning Commission voted to recommend the project subject to staff review. Staff has subsequently reviewed the project and concurs with the proposal with a modification to the amount of cost shared by the WMO. The original proposal by the City requested $35,362.75 from the WMO to be matched by cash of $17,646.38 from the City, in -kind construction efforts by the City of $11,646.38, and in -kind staff labor costs by the City of $6,164. The in -kind staff costs are for design, coordination, monitoring and assessment. County staff recommends changing this to remove the in -kind City staff costs as an eligible cost. County staff believes that WMO funds should be used to maximize project implementation, and that City staff costs to implement projects should be a part of their Local Water Plan implementation efforts. This change reduces the total estimated eligible project costs from $70,725.50 to $63,985.5, with the WMO share being $31,993 in cash and the City share as $31,992 (consisting of $20,346 in cash and $11,646 in construction). The City would also have the ineligible staff time costs of about $6,200. The current unencumbered balance of WMO cost share funds remaining in fiscal year 2010 is $171,408. Several other projects totaling about $33,000 are also being considered at this time. However, with approval of this innovative project and other pending projects the unencumbered balance will still exceed $100,000. Paul Nelson, Natural Resource Program Manager and Scott WMO Administrator is the contact for this action at 496 -8054 or pnelson @co.scott.mn.us. Ponds Park Athletic Complex — Stormwater Reuse System Summary The City of Prior Lake (City) is seeking a grant from the Scott Watershed Management Organization (WMO) for an innovative irrigation system at Ponds Athletic Complex. This grant project will retrofit an existing spray irrigation system that uses municipal water source to a local surface water source. This grant proposal includes several unique components that make it a prime candidate for Innovative Grant funding from the Scott WMO. The project area is located in the Scott. WMO north and east of Mushtown Road, south of CSAH 21, and west of Fish Point Road. The reuse system is sized to initially displace water use from 3 of 10 fields with potential to add the remaining 7 fields in future phases after system information is collected and analyzed. Proposed Improvement The project consists of installing a near surface groundwater collection system at the west edge of the nearby wetland area, installation of a floating island surface water filter intake on the nearby wetland area, installation of a cistern that holds water to supply peak pump rates and volumes, installation of a pump manhole and associated control system, power supply and water sampling devices and retrofit of the existing irrigation system to disconnect it from the municipal source. Data collection and proof-of-concept study is proposed to track the following: 1) Unit surface area flow rate of shallow groundwater and filtered surface water sources. 2) System water use and associated do-,Nrnstream water quality benefit. 3) Comparative soil nutrient trends of three practices (municipal water irrigated fields, recycled water irrigated fields and non-irrigated fields.) 4) Turf use and turf level of service of three practices. 5) System cost/benefit analysis, Benefit & Conclusion: This project will test methods of supplying filtered water to a surface water sourced irrigation system and quantify system wide reductions to peak runoff rates, runoff volumes and total nutrients while maintaining the required turf durability for an active play field. The project will serve as a demonstration of a unique design to reduce municipal groundwater use and will build local capacity to maintain a cleaner and greener source of irrigation water for highly used sport fields while promoting these technologies for use on a wider basis. - 1 - Ponds Park Athletic Complex — Stormwater Reuse System Details The Ponds Park Stormwater Reuse System is an innovative system that will reduce well water use, reduce nutrient sources upstream of Cleary Lake (nutrient impaired body) and test the long term viability and cost efficiency of using stormwater a source for irrigation for active use play-fields and other institutional open spaces. Risk Assessment: There are risks inherent with use of stormwater for irrigation and monitoring and testing will take place prior to installation of the system to confirm the viability of the proposal. Monitoring and testing will also be done throughout the two year study period to monitor long term trends in water and soil chemical constituents to ensure no adverse risk to health or property or the environment. One risk to using stormwater is to public health. Stormwater could contained contaminates in concentrations or type that would disqualify its use, or in low concentrations that could accumulate to significant levels over time. The following chemicals will monitored: Cadmium, Copper, Lead, Zinc, Arsenic, Polycyclic Aromatic Hydrocarbons and Diesel Range Organics. A second risk to fusing stormwater is to public property. Stormwater could contain contaminates that could cause a degradation to soil and affect its ability to grow thick and durable turf for athletic field use. The following chemicals will monitored: Alkalinity, Sodium, Chloride and Bicarbonates. Another risk is to the environment. It is expected that this system will provide benefit to the environment, but in all manmade systems there may be unintended consequences. Wetland water levels, wetland chemical data and total water usage will be monitored. Before construction begins on the planned water reuse system, the immediate risk assessment monitoring will take place and City staff will coordinate with the Scott WMO and SMSC to develop a plan for monitoring, managing and assessing risk. System Design. Ponds Park Athletic Complex currently has a municipal water sourced irrigation system, so the distribution pipes and irrigation heads are already in place. This proposal would isolate 3 of the 10 fields at Pond Park disconnecting them from the current water source, and replacing that source with a surface water source. Apart from testing the viability of stormwater reuse, this innovative grant includes testing of two innovative technologies; near surface groundwater sourcing and floating island skimming and filtering. There will be two routes for surface water to enter this system. The first, near surface groundwater source will use a drain the and sand trench along the perimeter of the nearby wetland to draw filtered groundwater to the cistern and pump. The other source will be a densely vegetated floating island system from Floating Islands -2- International http://www.floatingislandintemational.com/ that will draw surface water up through a dense tangle of roots and fibrous island material removing organic debris, sediment, nutrients, and metals. Both surface water sources will be able to be operated separately by opening and closing valves so flow rates can be determined. Water from either source will go into an underground chamber made of corrugated metal laid in a bed of aggregate and covered with earth. This chamber provides a volume of water equal to approximately three irrigation cycles allowing the slow filtering process that take place at the water sources to and recharge the chamber over a longer period. Water is then directed from the storage chambers to a 4' diameter pump manhole. This structure includes the irrigation pump systems, connections to an irrigation distribution line and water sampling ports. Electric connections and electronic control systems will be housed near this pump manhole. A new irrigation distribution line will run three hundred feet to connect to the existing distribution network. Study DesiM & Coordination- A proof-of-concept level study will be designed to track soil chemical and nutrient data to assess long term viability of the practice and model the environmental benefit it provides. Soils will be tested on three separate fields before and after the 2 year study period, 1) Fields will municipal source irrigation, 2) Fields with surface water source irrigation and 3) Fields with no irrigation. Water will be tested weekly during the irrigation season to review trends in pollutant sources and monitor risk. Testing frequency will vary depending on pollutant type and levels. The City will coordinate with Shakopee Mdewakanton Sioux Community (SMSC) staff that has extensive experience with wastewater and golf course stormwater reuse and pollutant source control to review initial testing data to determine practice viability and refine testing methods and study design. The City will also coordinate with the City of Lakeville and Vermillion River WMO on a similar ball field water reuse system being created to ensure lessons learned from either party inform the other. Innovative Practices: The Scott WMO board and WPC have defined an innovative practice to better fit the mission of the WM0. The following definition was provided (numbered references added): "New products (1) and emerging technologies (2) that provide customer and business value but signY7candy decrease aquatic resource impacts (3), decreases costs (4), and demonstrate its benefits in measurable ways(5). Projects that mimic natural processes IMM and enable biologicaijunctions(6) that are important to the ecological health of its setting, have the potential to be more cost effective and sustainable than existing methods, andfurl I ecological, social and culturalfunctions(7). In addition, maintains or enhances the quality of ly'efor its community (8). " These include products that- • reduce the use of non- renewable resources, • address runoff volume control or disconnected stormwater management in new or creative ways, decrease or minimize the amount of impervious surface(10), • improve buffering, and • relate people with the environment (11). Demonstration is a key part of an innovative practice and proposals should include a description of the demonstration value including a description of the potential for greater use of the practice should the demonstration he successful, as well as documentation of how it will be tracked, made visible, and accessible(12). " The following matrix shows how this proposal meets each part of the innovative project definition: 1. New products. This project tests a floating island system made from recycled carpet fiber material to Ater surface water and a sand lined drain tile system, to provide filtered near-surface water. 2. Emerging technologies. This project uses standard irrigation and stormwater components in a very innovative way testing flow rates 3. Decrease aquatic resource impacts: This project results in an annual change in volume of approximately to 6 acre feet of water. Associated pollutant removal is expected to be significant. 4. Decrease cost/Cost effective: Initial system design is not expected to be cost competitive on a $/Ib P or $/ton sediment basis alone, but through added benefits of reduced water and fertilizer use an expanded use of this practice is projected to be very cost competitive. 5. Measurable: The City is proposing multiple methods for measurement the effectiveness of the practice. 6. Mimic biological process/enable biological function: This practice will work to enable recycling of nutrient and water upon which biological systems are based. 7. Social and cultural functions: Risk management will ensure practice is a compatible use. 8. Enhance quality of life of community: This project will reduce water running into the City wellhead protection area from and associated surface water pollutants. While incremental, all of these wellhead protection initiatives help enhance quality of life of the entire community. 9. Over and above stormwater standards and levels of practice: -4- This project is neither required 10. Reduced material, Addresses volume, disconnects storinwater, and decrease impervious surface: This project has a recycled material component and addresses total water volumes. 11. Relate people with environment: Project publicity and informational signage will bring awareness to use of water for irrigation allowing people to see a portion of the entire water cycle and highlight this recycling element. 12. Demonstration description: This project will inform City staff and local partner decisions on source control and groundwater usage for irrigation. Future users may include school and private entities. Timeline and Deliverables (bold): November 2010: Initial soil and water tests, risk assessment and risk management plan. December 2010: Begin grading site, prefabricate and install cistern and order materials. January- February 2011: Prefabricate manhole, connections and control conduits, move equipment to site and install trench water source. March-April 2011: Install manhole, irrigation pump, controls and island water source. May 2011: Restore site and be-gin system testing. May 2011: Finalize testing and study design and begin monitoring water, levels and flow. May201 I -September 2012: Monitor water quality, levels and flow. September 2012: Take final soil tests and analyze data. November 2012: Final Report including test results, cost benefit, nutrient reduction model. Conclusion- The overall purpose of the Scott WMO Watershed Management Plan is to '`protect, preserve and manage natural surface and groundwater systems within the Scott WMO and Scott County in the face ofrapid urban growth and agricultural activity. " The Pond Park Athletic Complex Stormwater Reuse System will use a shallow groundwater source and filtered surface water source to irrigate 3 highly used sport fields. This project will result in reductions to nutrient pollution loads to downstream bodies by decreasing the amount of domestic water used for irrigation and its associated phosphorus load from corrosion inhibitors and by recycling - nutrient from nearby surface water allowing less overall fertilizer placement in the park, and less overflow of nutrients downstream. The area that drains into the wetland used as a water source includes an upstream residential areas, parking lots, play area, athletic fields, and surrounding natural areas which total an area of 67 acres. The annual water use will be a fraction of the additional runoff generated from the various land uses changes that have historically affected the natural system in the area. -5- Because of its innovative design features, alignment with WMO goals, treatment over and above the standard levels of practice, and the unique role the system will play in informing our system understanding, we believe the Ponds Park Athletic Complex Stormwater Reuse System is worthy of innovative project grant funding. I= 888 gg 888 ...... E�8. PaIR ci dg q a a, dD M 0 0 <D i ; a LHAAZZ;g T m RM Mm e tm us G1 M M M M M Lu 1 888 2 r- 99 ci 40 off w s 98 44 Yll 8 Y Em SM z z r5 I e.D (L ix t 1 888 2 r- 99 ci 40 off w s 98 44 Yll 8 Y Em Exhibit 2 Ponds Park Athletic Complex — Stormwater Reuse System DRAFT Plan for Risk Assessment and Risk Management Overview: The City of Prior Lake (City), with grant funding from the Scott Watershed Management Organization (WMO), is retrofitting a portion of the Ponds Park Athletic Complex spray irrigation system by disconnecting three fields from the municipal water source, then creating a cistern and pump to draw water from a local surface water source for irrigating these three fields. There are many potential benefits to reducing groundwater use, recycling nutrients on the landscape and reducing pollutants discharge to important downstream water resources such as the City of Prior Lake Wellhead protection area, Cleary Lake, and the Credit River (see also Study Design & Testing Protocol). However, there are risks inherent with use of stormwater for irrigation. This document describes the risk assessment and management that will be used during the testing and operation of the Ponds Park Athletic Complex Stormwater Reuse System (the system.) The purpose of this plan is to describe observational data and chemical testing, how it will be used to assess risks to public health, property and the environment, and what management actions may be taken as a result. System Description: Ponds Park Athletic Complex currently has a municipal water sourced irrigation system, so the distribution pipes and irrigation heads are already in place. The reuse system will isolate 3 of the 10 fields at Pond Park, disconnecting them from the current water source and replacing that source with a surface water source. -1- The proposed system includes: • a near surface groundwater collection system at the west edge of the nearby wetland area, • a floating island surface water filter intake on the nearby wetland area, • a cistern that holds water to supply peak pump rates and volumes, • a pump manhole and associated control system, power supply and water sampling devices, • retrofit irrigation distribution line, disconnected from the municipal source. Water from the near surface groundwater source and the island filter source flow into an underground chamber made of corrugated metal laid in a bed of aggregate and covered with earth. This chamber provides a volume of water equal to approximately three irrigation cycles, allowing the slow filtering process that takes place at the water sources to recharge the chamber over a longer period. Water then flows from the storage chambers to a 4' diameter pump manhole. This structure includes the irrigation pump systems, connections to an irrigation distribution line, and water sampling ports. Electrical connections and electronic control systems are housed near this pump manhole. Risk Factors: There are a variety of possible risks in using surface water as an irrigation source, Potential risks are enumerated and classified in this section. The primary risk factor of concern is to public health. • Stormwater could contain chemical contaminants in concentrations or type that could pose a risk to human health, or in low concentrations that could accumulate to significant levels over time. • Stormwater could contain bacteria or pathogens in concentrations that could pose a risk to human health. A second risk to using stormwater is to public property. • Stormwater chemistry could cause a degradation of soil and affect its ability to grow thick and durable turf for athletic field use. • Stormwater could contain debris, suspended sediment, or minerals that could lead to clogging of the irrigation distribution system. • Stormwater could react with the corrugated metal cistern to cause material failure. A third risk is to the environment. It is expected that this system will provide benefit to the environment, but in all manmade systems there may be unintended consequences. • Water levels could be drawn down excessively in the nearby wetland thereby reducing its function and value in the environment. • Wildlife could be killed if pulled into the cistern and pump. -2- Plan for Risk Management: Proper system design and operation will provide many ways to reduce risks to public health, property or the environment. This section will detail methods used to manage and reduce risk. Before construction begins on the planned water reuse system, (1) an initial risk assessment will take place. (2) The system design and method of operation will be informed by the risk assessment. (3) Risk monitoring will be conducted during a validation period. (4) After the validation period has ended the results will inform continuing operations. The four components of the Plan for Risk Management (PRM) are detailed below. PRM 1- Initial Risk Assessment The initial risk assessment includes the following efforts: a pollutant source analysis, an advisory panel review, and initial risk monitoring. Pollutant Source Analysis: Potential risk vectors in any stormwater reuse system vary widely depending on their source. An analysis of the catchment tributary to the propose surface draw showed 24.5 acres in single family land use, 33.3 acres in parkland use and 12.5 acres of natural areas and wetlands. This list will describe a variety of sources of pollution, review possible risk sources that currently exist or can change with the implementation of a water reuse system. Health risks & sources: • A source of concern for human health exposure from pollution is either directly from the irrigation water itself or due to build up of contaminate in the soil introduced by the irrigation system change. A risk source of concern to human health is through the drinking water source. This project is anticipated to reduce pollutant runoff to the Prior Lake wellhead zone. Another risk source to human safety comes from modified hydrology. • The single family land use is a potential pollutant source. Roofing material, driveway sealants, and pet waste can be sources of heavy metals, hydrocarbons, exotic pollutants or bacteria that may be associated with the land use. The single family land use is also a contributor to downstream risks associated with modified hydrology. This project is anticipated to reduce downstream hydrologic risk. • The park land use is expected to be a lesser pollutant source. Pollutant sources may include bacteria from pet wastes, accumulated pollutants from upstream or the existing irrigation system, and pollutants from agricultural chemicals used on park land. The park land use is also a contributor to downstream risks associated with modified hydrology. -3- • Natural area and wetlands may be a source of bacteria due to animal wastes or poor wetland water quality. Wetlands may also have accumulated pollutants from the upstream sources. The wetland may reduce potential downstream risks associated with modified hydrology such as flood risk and increased erosive potential. Property risks & sources: • A source of concern for property risk is from pollution either directly from the irrigation water itself or due to build up of contaminate(s) in the soil introduced by the irrigation system change. Another risk source to property comes from modified hydrology, flood risk or increased erosive potential. A third risk is to the proposed system itself, or to the irrigation distribution system, from sediment -laden water. • The single family land use is a potential pollutant source. Chlorides from road or driveway snow and ice control application are associated with this land use. • Existing water use on park may be a cause of property risk itself. Excess volume of irrigation water can also contribute to downstream risks associated with modified hydrology. There is also a potential that irrigation from the potable water supply over the years has caused soil buildup of hardness, magnesium or iron associated with the water supply. • Natural area and wetlands may be a source of pollutants that cause property risk to the propose system. Turbidity and suspended sediment can cause system clogging. Wetlands may also have accumulated pollutants from the upstream sources. Environmental risk & sources: • The reuse system itself could present a risk to wildlife or the environment. Excessive water use could reduce the size, function and benefit of the wetland. • The single family land use is a known pollutant source that causes environmental risk. All of the above named pollutants can cause a detrimental effect on wetland habitat and nearby ecosystems. Nutrient and sediment runoff from the single family land use may have a significant impact on biological diversity and water clarity. • The parkland use may be a source of environmental risk. The significant quantities of irrigation water can cause modified hydrology of the wetland and downstream resources including sensitive stream banks. In addition to the pollutants mentioned in the "property" section above, potable sourced irrigation water can also include anticorrosive chemicals that become phosphorus sources that contribute to the problem of eutrophication. • Natural area and wetlands are not expected to be a major source of pollutants, but may accumulate pollution generated upstream. If large populations of invasive species take hold causing system instability, natural area may become a source of pollution. If upstream sources are -4- reduced or eliminated, wetland areas may act like a sink or a source of pollutants. Advisory Panel Review: A multidisciplinary group of water resource and scientific professionals will be invited to review the study and risk assessment and provide informal comments to help the City of Prior Lake judge the relative importance of any risk factor. City staff will convene and coordinate with a technical advisory group (TAG) as it implements and develops this plan for monitoring, managing and assessing risk. Technical Advisory Group: Sara Barsel, Ph.D., Volunteer Mike Kinney, PLSLWD Ross Bintner, P.E., City of Prior Lake Troy Ku hal, Scott SWCD Terry Bovee, MN DOH Robert Scarlett, Midwest Floating Islands Sara Brown, MPCA Michael Seterin , ACOE Mac Cafferty, City of Lakeville Jason Swenson, RE, Scott WMO Andy Erickson, P.E., UMN Scott Walz, SMSC Al Fried es, City of Prior Lake - Craig Wills, MN DNR Todd Hubmer, P.E., WSB & Associates Initial risk monitoring: Monitoring and testing will take place prior to installation of the system to confirm the viability of the proposal. The following parameters will be considered for initial monitoring. Health Risk monitoring parameters Cadmium, Copper, Lead, Arsenic, Polycyclic Aromatic Hydrocarbons, Diesel Range Organics and Bacteria. Property Risk monitoring parameters Alkalinity, Sodium, Chloride and Bicarbonates. Environment monitoring parameters Wetland aerial photo review, wetland bathymetry, annual water balance, wetland water levels, wetland chemical data, total system water usage and system function. Risk parameters will be chosen based on the ability to test for and analyze samples at levels that are relevant to the corresponding risk. Testing will take place before and after a 2 season validation period on soils, and during the 2 season validation period on the irrigation water. PRM 2- System Design and Operation Design of the reuse system and its method of operation will be informed by the plan for risk management. The system should be: 1) designed to reduce known risks, 2) be designed to allow for minor modifications that provide flexibility for continued operation -5- if new risks are discovered, and 3) should allow for multiple methods of operation that have flexibility to fulfill the system design level of service. Risk Reduction, Flexible Design & Operation: System design, operation and assessment to reduce each risk type: Design to mitigate health risks. • System design will filter water at the surface intakes. • System design will draw from surface water source at a point hydrological remote from possible sources of pollution. • System design will be able to be modified to add additional filtration or UV treatment of intake water. • System design will be able to be modified to add make -up water from municipal source, if required. Operations to mitigate health risks. • System will be operated late at night or early in the morning to reduce exposure. A minimum time for drying will be set for all scheduled activities. Area irrigated will be posted with warnings at all potential access points to warn users and passers -by to avoid contact with irrigation water and wet fields. Design to mitigate property risks. • System design will filter water at the surface intakes. • System design will draw from surface water source at a point hydrological remote from possible sources of pollution. • System design will be able to be modified to add additional filtration or UV treatment of intake water. • System design will be able to be modified to add make -up water from municipal source, if required. Operations to mitigate property risks. • System operation is expected to reduce downstream property risk. • System operation can be modified to extend wait period between irrigation cycles to reduce draw rates. Design to mitigate environmental risks. • System design will be able to buffer higher pump intake rates by using an underground cistern. • System design will allow surface water draw from two different filtered sources. • System design will allow very diffuse draw at each source. • System design will be able to be modified to add make -up water from municipal source, if required. Operations to mitigate environmental risks. -6- • System operation is expected to reduce downstream flood risks and improve water quality. • System operation is expected to reduce downstream pollutant risk to wellhead protection area. • System operation is expected to reduce groundwater use. • Fertilizer applications will be adjusted to suit changing soil fertility levels. • Minimum water elevation will be set during validation period. • Minimum water elevation will be set for continuing operations. • Maximum yearly water use will be set. PRM 3- Validation Period Risk Monitoring Over the course of two seasons of operation, the reuse system will be monitored to review known risks and track potential benefit. Monitoring of each risk type: Monitoring to mitigate health risks. • Soil and water will be tested for key risk criteria during validation period. Monitoring to mitigate property risks. • System operation will be monitored to ensure that system itself does not introduce risk to irritation distribution system. • Soil and water will be tested for key risk criteria during validation period. Monitoring to mitigate environmental risks. • Survey will be complete to measure wetland outlet elevation and bathymetry. • Wetland stage data will be collected during validation period to inform continuing operations. • Total water use will be tracked. • Soil and water nutrient data will be tested to determine benefit. PRM 4 -Final Report and Continuing Operations Following the two season validation period, a report will be written summarizing the risk assessment and monitoring effort and providing a manual for continued system operations. Schedule of Activities and Reporting Conclusion: -7- Exhibit 3 Midwest Floating Island Bio- Filter Description: This Floating Island Bio - Filter is dimensioned to handle flow rates of up to 40 GPM of water. The water will flow by gravity out of the center draw tube thereby drawing water up and through the roots of plants growing on the island and the structure of the island itself. The island will be comprised of 2 individual 7' X 12' modules that are attached firmly together with embedded cables to form a single island structure that has a top surface area 14' X 12', or 168 sf. The modules will be constructed of a bonded fiber matrix made from recycled water bottle PET. Buoyancy is calibrated with PU foam that is injected into the matrix structure. Final buoyancy of the island will be adjusted to float with 15% to 25% of the structure above the water line. A draw tube will be attached on the underside, central area of the island to draw off the discharge water by gravitational siphoning. The island module will have internal tubing to provide for a balanced draw of water from across the structure of both modules. On the top, center of the island will be an artificial rock that provides for reserve buoyancy over the draw tube and access to the central manifold area from which the tube draws water. The first sketch below shows a top view of the Floating Island Bio - Filter with an indication of the expected waterline on the island. The green area on top of the island is a simulation of the sod and wetland plants with which the island will be vegetated. The vegetated surface of the island with a central artificial rock will be the only visible out of the water elements of Floating Island Bio- Filter to observers from the shoreline. The roots of these plants will hang below the island. The brown area below the waterline shown in the second sketch is the exposed matrix material through which plants will grow. The microbial bio -film that will form on the matrix and plant structure will provide an active wetland treatment of the water flowing through the root and island structure. The draw tube will be attached in the center as shown. It is tied to the artificial rock structure on the top side of the island thereby sandwiching the island modules between the structures above and below the island. The outlet end of the draw tube will be fixed to the appropriate tube for discharge outside of the pond. This discharge point should be dimensioned to provide at least 3'of hydraulic head for gravitationally drawing water through the system. Sketch 1: Top view of Bio- Filter with blue waterline Sketch 2: Bottom view of Bio- Filter with central draw tube The Floating Island Bio- Filter will be shore tethered with nylon rope or anchored in at least two directions to provide for a relatively fixed positioning of the island. A goose deterrent, monofilament, fence will be placed around the perimeter of the island until the vegetation has achieved sufficient height to provide a natural deterrent to geese rousing on the island. Materials and service included in the Floating Island Bio - Filter are as follows: • 2 island modules with 4 tether points • Cable system to attach the 2 modules together • Central, reserve buoyancy, artificial rock • The draw tube central manifold up to the flexible draw tube • Up to 50' of flexible draw tube • Bio -Mix and rock wool to prepare the island for planting • Sod for initial green island coverage • Goose deterrent fence • Delivery of all components to the job site • Island assembly and launch supervision • Island assembly and launch labor • Island tethering orientation and support Materials and service not included in the Floating Island Bio - Filter: • Specific native wetland plants desired for this site • Shore tethering points or anchors • Shore pipe for attachment of the draw tube • Shore valve for control of the draw tube flow • Monitoring and testing of the Floating Island Bio- Filter performance Costs: The retail value of this 168 sf Floating Island Bio- Filter is approximately $5,240. For this demonstration project for the City of Prior Lake, Midwest Floating Island is offering to participate with 75% of this value. The total cost of the Floating Island Bio - Filter would therefore be $1,310.