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031008 CC WS AgPCITY OF SHOREWOOD CITY COUNCIL WORK SESSION MONDAY, MARCH 10, 2008 AGENDA 1. 2. 3. 4. 5. 6. 7. CONVENE CITY COUNCIL WORK SESSION A. Roll Call B. Review Agenda CITY HALL BUILDING (Att. -Collaborative Design Group Report) Mayor Lizee Woodruff Turgeon Vacant (W3) Wellens COMPREHENSIVE WATER RESOURCES MANAGEMENT PLAN UPDATE (Att. - Engineer's memorandum) STORMWATER DISCUSSION (Att -Director of Public Works' memorandum) ROADWAY PROJECT PLANNING SEMINAR OTHER ADJOURN 5755 COUNTRY CLUB ROAD COUNCIL CHAMBERS 6:00 P.M. COLLAS®RATIVE " ~" Ar~:h~iecture Engineering Interiors Planning 4 March 2008 Shorewood City Hall, Shorewood, Minnesota Existing Structure Report Investigation Site On 27 February 2008, Phil Waugh and Brian Lubben worked with City of Shol•ewood operations staff to perform an on site investigation of the Shorewood City Hall structure at 5755 Country Club Road, Shorewood, Minnesota. The temperature was in the mid 20's with a ten mile per hour wind and there was no precipitation. There were several inches of snow cover present on the ground. The existing single story structure consists of a concrete block basement with poured concrete basement slab, wood framed exterior walls with wood siding and trim, and a wood framed roof with asphalt shingles. Investigation Method Three quarter inch diameter holes were drilled in the exterior walls from the exterior side and a lighted borescope was used to look inside the wall cavities and under the siding. In one location an approximately 4 by 5 inch hole was cut allowing full access to the wall cavity. In one location the siding was pulled back to expose the wall sheathing behind. Several horizontal. wood batten trims covering the window sills were also removed. No moisture or ice was visible in the inspections. Holes were closed at the completion of the investigation. Typical Wall Section The typical wall section for the building and condition of those materials was discovered to be as follows... ^ I x 3 inch vertical and horizontal wood battens, wood species undetermined, fair to poor condition respectively ^ 3/8 inch rough sawn plywood siding, wood species undetermined, applied in 4 x 8 foot sheets, many areas of detachment from sheathing, poor condition, siding at horizontal end joints in very poor condition ^ Asphalt felt, probably I S pound, good condition ^ l/2 inch gypsum wallboard sheathing, undetermined fire resistance, delaminated from face paper in several areas, fair to poor condition ^ 2 x 4 wood studs, spacing undetermined, generally good condition, condition at deteriorated sill plates undetermined ^ Full thickness batt insulation, probably R-11, good condition ^ Polyethylene vapor barrier, good condition ^ Gypsum wallboard interior finish, probably 1/2 or 5/8 inch thick, good condition hffirrnative Fletiorr, Equal CJppart~~n~ity Employer ioo E'ortlanci ; rVhinne< t6l ww~.*.r.coilak ..~ v ~., Findings During the initial building construction, sealant was installed at the joint between the window sill frame and the edge of the siding below. This construction detail most likely prevented extensive damage below the windows by preventing water captured by the horizontal batten trim from being directed into the wall cavity. The poor condition of the horizontal trim may have actually helped preserve the wall below by allowing water to pass through the trim rather than being captured by it. The lack of thickness of the exterior siding does not promote dimensional stability of the panels. The wood siding is delaminated and detached from the sheathing in many areas. Filled areas in the face veneer remain intact. Horizontal laps between wood siding sections are flashed with a small metal zee flashing. The flashing is too small and installed incorrectly allowing water to enter siding above and below flashing. One hole drilled at the sill plate resting on top of the basement wall showed the sill plate to be deteriorated. While dry at the time of the investigation, the condition of the sill plate indicates the continuous presence of moisture over an extended period of time. The sill plate at the location examined was very near to or at grade. Based on the findings in the upper portions of the wall, the sill plate may be absorbing moisture from the concrete block below or infiltrating from the adjacent grade. It was not determined if the sill was pressure treated lumber or if a sill sealer/barrier was present. The deteriorated sills will require replacement or other correction at various areas of the foundation, most likely the north and west elevations. The planned additions to the building are located in these same areas and will allow for easier replacement. Visible inspections of the wood trim at fascias, soffits, and rakes show various levels of deterioration. Most or all of these materials should be replaced in the renovation. Louvered soffit vents may be obstructed by dirt and preventing air flow. Relatively short truss heel height and resulting thin layer insulation promotes ice dams and roof damage. One area showed roof water entering into soffit and emerging near exterior siding. The roof has been recently replaced and is in good condition. There is a roof ice melting system installed at the north elevation. Windows are fixed aluminum with insulated glass, both in good condition. The age of the window framing suggests that the system is not a thermally broken system. Recommendations Due to the advanced deterioration of the building envelope, we recommend removal of the wood batten trim, the wood siding, asphalt felt, and the gypsum wallboard sheathing on the whole of the building. After this removal, the contractor should perform a visual inspection of the wood framing and insulation to identify and correct any deteriorated areas of either of these construction components. Existing wood fascias, soffits, soffit vents, and other trim should be replaced or reinstalled as required. The sheathing should be replaced with oriented strand board or asphalt impregnated wood fiber board. Either new non-woven polypropylene air barrier or asphalt impregnated building felt should be installed based on the new siding material. New siding should be installed. New or existing wood trim should be installed or reinstalled. All existing and new exterior wood and other siding materials should be primed and painted. Submitted This report is submitted by Brian Lubben, Senior Associate, Collaborative Design Group. End. V V _ N ~ ~ I I I I I i I I I i I I ~ I i ~a,~r~ t, ~' ~r~.,, ,.~. ~ ~ , } i E `,,~ k , ~' } ~ S 1 ~ 4 , i 1 ~ ~~~~~ ~~. ~~', ~,, ~ 1 3 -~~, ~_-,' a~ ~~ l~~~ F~_~;. ~, ~f~- :' ~ l''~ ~ i I~J; `~~' (~ ~`y ~r ~, ~ ~ f ~ _ ~ 1~ 1 j ~ ,+~ 1 ~ r~ J' } `~~~ .. f j {- ~ 6 ~ p. ,y ~ -~ ~: - ~~- -~_ ~ - - y , ,,~' - ~ j ~,~?o' -- ~ ~ 1 ~"`~{ ~~ ____ ".. 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', i"._ ;:..~.j, r _~ „ 1 ~U~ ~~ jli- »i ? - ~~ I ~; ~' J}, YY a7 ,;, ~ Infrastructure ^ Engineering ^ Planning ^ Construction March 10, 2008 Honorable Mayor and City Council City of Shorewood 5755 Country Club Road Shorewood, MN 55331 Re: Comprehensive Water Resources Management Plan Update WSB Project No. 1459-23 Dear Mayor and City Council: 701 Xenia Avenue South Suite 300 Minneapolis, MN 55416 Tel: 763 541-4800 Fax: 763 541-1700 The purpose of this letter is to provide you with another update on our work effort to revise the City's Comprehensive Water Resources Management Plan. As you maybe aware, this plan is being updated to reflect changes in requirements from the Metropolitan Council, as well as the Minnehaha Creek Watershed District, and the Riley-Purgatory-Bluff Creek Watershed District. Attached are various sections of the new Management Plan. Based on your feed back fiom the January 28th work session, we have revised Sections IV and V. There is one addition to Section V that I would like to call to your attention. Based on comments we have received fiom Minnehaha Creek Watershed District on other Cities' Plans, we have added another policy to mirror their requirement for infiltration. This is included as Policy No. 1 under Infiltration /Volume Control on page 9 of Section V. The sections that we would like to focus on this evening are Sections VI and VII. Section VI outlines the proposed implementation plan and the costs associated with each item. These costs were determined by reviewing the City's Capital Improvement Plan and input fiom staff regarding time efforts to comply with the requirements of the City's Storm Water Pollution Prevention Plan. Section VI presents the financial considerations involved with the implementation plan. As you can see, there is a deficit of approximately $500,000 over the 10-year span considered. These costs do not include inflation, so there will be a need to secure additional funding through an increase in the Storm Water Utility Fee, contributions from the General Fund, grants from outside agencies, or a combination of these items. It is recommended that all of these items be included to identify projects that may potentially be available for grants from MCWD or other agencies. r!~ K11959-23I Adm in I Docs ILTR-hip Honorable Mayor and City Council Comprehensive Water Resources Management Plan Update March. 10, 2008 Page 2 If the plan is acceptable, we will be submitting the plan to the Watershed Districts and Met Council for comments. It is anticipated that the stakeholders will use their fu1160-day comment pehiod to provide input. Once we have received their comments, we will finalize the report and re-submit it for approval. I will be at the work session meeting on March 10th to discuss this plan in greater detail. I look forward to meeting with you and answering your questions at that time. Sincerely, WSB & Associates, Inc. Steven G. Gurney, PE Enclosures lh KV 459-23IAr6iiin IDocs ILTR-hmcc-0310305-email doc SECTION IV IV. PROBLEMS AND CORRECTIVE ACTIONS Outlined below is an assessment of existing and potential water resource-related problems that are known at this time. These problems have been identified based on an analysis of the land and water resource data collected as part of this plan preparation and through information from the City. A description of any existing or potential problems within the topic area has been listed and future corrective actions have been incorporated into an implementation plan. A. Lake and stream water quality problems Impaired waters to which the City discharges and the currently approved impairments for each are listed below: • Lake Minnetonka: Mercury • Christmas Lake: Mercury • Lake Virginia: Mercury, Total Phosphorus • Lake Minnewashta (Located outside of the City): Mercury Corrective Actions: The City shall work with the Minnehaha Creek Watershed District to develop a Total Maximum Daily Load (TMDL) for the impaired waters within its boundaries. Currently, the Total Maximum Daily Load (TMDL) requirement for mercury is being developed at the state level. Once developed, the City will review the TMDL and determine if additional policies are needed. 2. The Minnehaha Creek Watershed District requires that the City provide an annual reduction of 50 pounds of phosphorus for areas that drain to Lake Minnetonka from the City of Shorewood. There are also requirements for an annual reduction of 4 pounds and 3 pounds of phosphorus for areas that drain to Lake Virginia and Christmas Lake, respectively. Corrective Actions: The City will continue to work with developers to provide treatment for areas as they redevelop. Since 2000, several storm water treatment ponds have been constructed. These ponds will remove approximately 16 pounds of phosphorus annually. The City's remaining allocation can be removed by adding a fall sweeping operation in selected areas of the City. 3. Storm water pond maintenance for improved water quality treatment, flood control, and aesthetics is needed at the following ponds: • Manor Park Pond Corrective Actions: The City, in cooperation with MCWD, will complete a feasibility study to identify methods to improve this water body as funds are available. City of Shorewood Section IV -Page 1 WSB Project No. 1459-23 March 2008 SECTION IV B. Flooding and storm water rate control concerns 1. Drainage problems have been reported in the following areas: • 22015 Stratford Place • Lake South Auto • Lake Mary 0 23980 Yellowstone Trail 0 23955 Clover Lane 0 23930 Yellowstone Trail 0 23950 Elder Turn 0 23905/23895 Elder Turn • 6180 Murray Hill Road • 5925 Grant Street • 5915 Grant Street • 23350 Academy Road • 6180 Chaska Road Corrective Actions: The City will work with the Minnehaha Creek Watershed District and Riley/Purgatory/Bluff Creek Watershed District to manage flooding and rate control concerns experienced within the City. The City will also complete hydraulic and hydrologic analysis and feasibility reports for each of the flooding and drainage problem areas noted above and follow up as appropriate. The costs for these activities are outlined in the City's CIP, summarized in Table VI-1. 2. A number of landlocked subwatersheds are located within the City. Corrective Actions: Lake Mary currently threatens homes located on the east end of the lake, near Clover Lane and Elder Turn. The City will complete a feasibility study for constructing an outlet from this area. For other landlocked areas, the City will require redevelopment plans within these subwatersheds to utilize strategies that minimize downstream flooding and additional runoff volumes. C. Impacts of water quantity or quality management practices on recreational opportunities 1. The City has not experienced any impacts to recreational opportunities as the result of water quantity or quality impacts. Corrective Actions: No corrective action needed. D. Impacts of storm water quality on fish and wildlife resources 1. The City recognizes that there is currently not enough water quality monitoring data available to determine the effects of storm water quality on area lakes. Corrective Actions: Consider implementing a water quality monitoring program in cooperation with MCWD. City of Shorewood Section IV -Page 2 WSB Project No. 1459-23 March 2008 SECTION IV E. Impacts of erosion and sedimentation on water resources 1. Soil erosion and sediment transportation associated with new development may impact the quality of water and storage volume available within City lakes, streams, and ditches. Corrective Actions: Consider development and implementation of an erosion control ordinance 2. Erosion problems have been reported at the following locations: Footprint Lake Waterford Place drainage way Corrective Actions: The City will monitor conditions of these areas and consider maintenance and improvement options if needed. 3. The MCWD has requested that shoreline conditions on Christmas Lake, specifically the eastern shore, be monitored and maintained. Shoreline restoration practices need to be implemented to prevent erosion. Corrective Actions: The City will undertake efforts to educate private property owners and provide technical assistance to private property owners to identify maintenance and improvement options if desired by Owners. F. Impact of land use practices and development on water resource issues 1. The MCWD has identified an area north of Lake Virginia and an area west of Christmas Lake as Key Conservation Areas. 2. Corrective Actions: The City will work with MCWD to appropriately protect these areas where possible. A small portion of upland area has been developed north of Lake Virginia. G. Adequacy of existing regulations to address adverse impacts on water resources 1. The City of Shorewood generally has adequate regulatory controls in place to manage and mitigate adverse impacts on public waters and wetlands. However, additional ordinances or ordinance updates are necessary to continue to have adequate regulatory controls. Corrective Actions: Continue to implement the Storm Water Pollution Prevention Plan. The City of Shorewood will continue to implement Best Management Practices, review and revise existing ordinances, as necessary, and develop new ordinances such as: Erosion Control Illicit Discharge Storm Water Management City of Shorewood Section IV -Page 3 WSB Project No. 1459-23 March 2008 SECTION IV H. Identification of potential problems which are anticipated to occur in the next 20 years based on growth projections and planned urbanization. 1. The City is almost entirely developed; however, the City recognizes that increased development in the future may increase the volume of runoff directed to the current storm water storage and conveyance systems within the City. 2. The City anticipates the quality of storm water runoff generated from newly developing areas will be treated prior to discharge from the City to areas of concern. Corrective Actions: Implement the City of Shorewood Water Resource Management Plan. I. Availability and adequacy of existing technical information to manage water resources. 1. The development of this Comprehensive Water Resource Management Plan has provided additional technical information to the City related to storm water management. Corrective Actions: The City will continue to update the hydrologic/hydraulic model and GIS database as new development and redevelopment occur. This activity is included in the City's Storm Water Pollution Prevention Plan as Minimum Control Measure (MCM) 3-Illicit Discharge. Costs for implementing MCMs are included in Table VI-2. City of Shorewood Section IV -Page 4 WSB Project No. 1459-23 March 2008 SECTION V V. ESTABLISHMENT OF GOALS AND POLICIES The City has developed a number of goals, strategies, and policies for the management of storm water within the City. These goals and policies have been developed to complement any county, regional, or state goals and policies. The goals of the City are as follows: Goals 1. Minimize public capital expenditures needed to correct flooding and water quality problems. 2. Identify and plan for means to effectively protect and improve surface and groundwater quality. 3. Prevent erosion of soil into surface water systems. 4. Promote groundwater recharge. 5. Protect and enhance fish and wildlife habitat and water recreational facilities. Secure the other benefits associated with the proper management of surface and ground water. In order to achieve the City's goals for managing storm water, four strategies were developed. These strategies will assist the City in targeting its main audiences for the purposes of storm water management as follows: Strategies Cooperation with other agencies: This strategy recognizes that the City is not alone in managing storm water within its boundaries. There are a number of other local, state, and federal agencies that also have rules and regulations related to storm water management. Through this strategy, the City has recognized these other agencies' role in this endeavor and will cooperate and coordinate with these agencies as deemed necessary by the City. Education: This strategy includes educating various groups within the City about proper storm water management. Education of residents, City Staff, City Council, business owners, and developers is included in this strategy to assist in meeting the City's goals. Regulation: Much of storm water management comes in the form of regulations put on new or redevelopment within the City. These regulations will also assist the City in achieving their water management goals. Policies related to the management of storm water are included in the regulation strategy. Internal operations: The final strategy relates to the internal operations of the City. By outlining policies related to how the City's operations will treat and manage storm water, the City can work to achieve its storm water management goals. The City has identified target audiences for the policies outlined in each strategy. The target audiences and strategies are as follows: City of Shorewood Section V -Page 1 WSB Project No. 1459-23 February 2008 SECTION V AUDIENCE Public -Residents and Business Owners City Staff and City Council Developers Review Agencies STRATEGY Education, Regulation Cooperation, Education, Operation Education, Regulation Cooperation Based on the target audience and the strategy, the City has developed a number of policies. These policies are outlined below. A. COOPERATION WITH OTHER AGENCIES There are a number of other local, state, and federal agencies that have rules and regulations related to storm water management. Through this strategy, the City recognizes these other agencies' role in this endeavor and will cooperate and coordinate with these agencies as necessary. This Plan is in conformance with but does not restate all other agency rules that are applicable to water quality and natural resource protection. The other agency rules and policies include rules, policies, and guidelines associated with the following organizations: • Minnesota Department of Health www.health.state.mn.us • Minnesota Pollution Control Agency www.pca.state.mn.us • Board of Water and Soil Resources www.bwsr.state.mn.us and the Wetland Conservation Act www.bwsr.state.mn.us/wetlands/wca/index.html • Minnesota Department of Natural Resources www.dnr.state.mn.us • US Army Corps of Engineers www.mvp.usace.army.mi • Minnesota Department of Agriculture www.mda.state.mn.us • US Fish and Wildlife Service www.fws.gov • Minnehaha Creek Watershed District www.minnehahacreek.org • Riley Purgatory Bluff Creek Watershed District http://www.rileypurgatorybluffcreek.org • Lake Minnetonka Conservation District http://www.lmcd.org While these other agency rules, policies, and guidelines are not all restated in this Plan, they are applicable to projects, programs, and planning within the City. The Minnesota stormwater Manual, which is a document intended to be frequently updated, is incorporated by reference into this Plan and can be found at www. pca.state.mn. us/water/stormwater/stormwater-manual. html. City of Shorewood Section V -Page 2 WSB Project No. 1459-23 February 2008 SECTION V B. EDUCATION The purpose of the education strategy in meeting the City's goals is to foster responsible water quality management practices by educating residents, business owners, City Staff, City Council, and developers about proper storm water management. If these targeted audiences recognize their role in responsible storm water management in their homes, businesses, and practices, it is another means for the City to meet its goals. This education strategy has also been designed to be in conformance with the NPDES requirements. STRATEGY: EDUCATION No. Poiic Tar et Audience 1. The City will continue to implement its public education program Residents, Business as part of the NPDES Phase II program. Owners, Developers, City Staff and Council 2. The City will develop and update its website for water resource Residents, Business management information. Owners, Developers 3. The City will develop and distribute annual newsletter and include Residents, Business information in other City mailings aimed at fostering responsible Owners, Developers water quality management practices. Topics may include, but not be limited to: • Wetland buffers • Groundwater quality and protection • Controlling invasive species • Water conservation and the water cycle • Proper hazardous waste disposal • Yard waste management • Pet waste disposal • Illicit discharge 4. The City will collaborate with MCWD, RPBCWD, and LMCD in Residents, Business storm water management education efforts. Owners, Developers 5. The City will provide annual training opportunities to City Staff City Staff regarding housekeeping and construction BMPs and the NPDES permit requirement. 6. The City will conduct pre-construction meetings with contractors City Staff, to review erosion control methods and inspections for projects Contractors, that disturb one acre or more for City projects. Residents City of Shorewood Section V -Page 3 WSB Project No. 1459-23 February 2008 SECTION V STRATEGY: EDUCATION No. Policy Target Audience - - _-_ 7. _ The City will encourage programs aimed at fostering responsible -- Business Owners, water quality management practices by its residents, including Residents educating residents on the proper use of fertilizer. Information on the City's Public Education Program is included in the City's NPDES Storm Water Pollution Prevention Plan at City Hall. 8. The City will submit a public notice 30 days in advance and hold Residents, an annual public meeting to review the SWPPP, Surface Water Developers, Management Plan, and BMPs. Business Owners 9. The City will maintain a phone line and website link to report Residents, construction site erosion control concerns and waste disposal Developers, infractions. The phone number is (952) 474-3236 and the City's Business Owners website is www.ci.shorewood.mn.us. 10. The City will work with landowners through public education Residents, efforts to reduce the amount of animal or pet waste entering local Developers, water bodies. Business Owners 11. Prepare and distribute information on pertinent water Residents, management issues to city residents a minimum of one time per Developers, year and as required as part of the NPDES Phase II program. Business Owners This information will be incorporated into the City's newsletters and will provide an opportunity for residents to participate in watershed management activities. A copy of the description of the program to be implemented by the City is in the NPDES Storm Water Pollution Prevention Plan at City Hall. C. REGULATION The policies developed in this strategy outline specific storm water management elements that are required to be implemented through the development and/or permitting process. The regulation strategy is targeted at the public, developers, City Staff, and City Council. STRATEGY: REGULATION No. Polic Tar et Audience Rate Control 1. Future discharge rates from new development and redevelopment will not exceed existing discharge rates. Developers City of Shorewood Section V -Page 4 WSB Project No. 1459-23 February 2008 SECTION V STRATEGY: REGULATION No. Polic Target Audience 2. Design calculations for the 1 %, 10%, and 99% chance storm event Developers must be submitted to the City for review and approval. Discharge rates must be based on pre-development conditions allowing for no increase compared to existing rates. 3. The design of major storm water storage facilities shall Developers accommodate a critical duration event with a 1 % chance of occurrence. 4. The design of new storm sewer systems shall be based on a critical Developers duration rainfall event having a 10% chance of occurrence in any given year for local storm sewer. 5. For collection systems not designed to meet rate control standards Developers (i.e. catch basins) a clogging factor of 50% will be utilized in sizing intake structures. 6. No orifice having a diameter less than 8" is allowed in the design of Developers rate control structures within the City. 7. An emergency spillway (emergency outlet) from ponding areas shall Developers be installed a minimum of 1 foot below the lowest building opening and shall be designed to have a capacity to overflow water at an elevation below the lowest building opening at a rate not less than 3 times the 100-year peak discharge rate from the basin or the anticipated 100-year peak inflow rate to the basin, whichever is higher. 8. As part of any new development or redevelopment within the City, Developers on-site retention and treatment for storm water runoff will be required to conform to the policies outlined in this plan unless an approved off-site regional facility is available to accommodate this runoff. Flood Control 1. The 100-year high surface water elevation will be derived from the Developers City's hydrologic/hydraulic model in Appendix A and information from the FEMA Flood Insurance Study. For Silver Lake and the Silver Lake branch of Purgatory Creek, the 100-year high water elevation developed by the Riley Purgatory Bluff Creek Watershed District will be used as shown also in Appendix A. City of Shorewood Section V -Page 5 WSB Project No. 1459-23 February 2008 SECTION V STRATEGY: REGULATION I No. Polic ~ Target Audience 2. Any new or redevelopment building construction within the City will Developers maintain a minimum building opening elevation 3 feet above the projected 100-year high water elevation for the area. If this 3 foot building opening freeboard requirement is considered a hardship, the standard could be lowered to 2 feet if the following can be demonstrated: • That, within the 2-foot freeboard area, storm water storage is available which is equal to or exceeds 50% of the storm water storage currently available in the basin below the 100-year elevation. • That a 25% obstruction of the basin outlet over a 24 hour period would not result in more than 1 foot of additional bounce in the basin. • An adequate overflow route from the basin is available that will provide assurance that one foot of freeboard will be maintained for the proposed low building opening. 3. Any new development or redevelopment in the City must set Developers minimum basement floor elevations to an elevation that meets the following criteria: • The basement floor will be four feet (4') above the currently- observed groundwater elevations in the area (FHA policy). • The basement floor elevation will be two feet (2') above the elevation of any known historic high ground water elevations for the area. Information on historic high groundwater elevations can be derived from any reasonable sources, including piezometer data, soil boring data, percolation testing logs, etc. • For areas outside of the RPBCWD boundaries, the basement floor elevation will be one foot (1') above the 100-year high- water elevation for the area unless it can be demonstrated that this standard creates a hardship, and that the basement floor will be one foot (1') above the highest anticipated groundwater elevation that could result from high surface water elevations elevating groundwater elevations in the area during the 100- yearcritical duration rainfall event. The impact of high surface water elevation on groundwater elevations in the vicinity of the structure can take into consideration the site's distance from the floodplain areas, the soils, the normal water elevation of surface depressions in the areas, the static groundwater table, and historic water elevations in the area. • For areas within the RPBCWD boundaries, the low floor elevation must be a minimum of 2 feet above the calculated 100-year flood frequency elevation. City of Shorewood Section V -Page 6 WSB Project No. 1459-23 February 2008 SECTION V STRATEGY: REGULATION No. Polic Tar et Audience 4. No structure (temporary or permanent), fill (including fill for roads Developers and levees), deposit, obstruction, storage of materials or equipment, or other uses may be allowed as a conditional use that will cause any increase in the stage of the 100-year flood or cause an increase in flood damages in the reach or reaches affected. 5. The City may allow an outlet to land locked basins, provided that Developers the discharge rate from these basins not exceed the 10-day, 100- year average daily run-off rate and that it can be demonstrated that this discharge will not significantly impact the downstream flood profile. 6. The City will require compensatory storage equal to storage losses Developers resulting from floodplain fill as part of any new development. This compensatory storage must be provided in a suitable location so as not to increase the 100- ear floodplain elevation for the area. Water Quality Treatment 1. Treatment of storm water to NURP guidelines is required prior to Developers storm water discharge to a lake, stream, or wetland and prior to discharge from the site as part of development. The NURP guidelines for the design of storm water treatment basins are as follows: a. A permanent pool ("dead storage") volume below the principal spillway (normal outlet) which shall be greater than or equal to the runoff from a 2.5-inch storm over the entire contributing drainage area assuming full development. b. A permanent pool average depth (basin volume/basin area) which shall be > 4 feet, with a maximum depth of < 10 feet. c. Basin side slopes above the normal water level should be no steeper than 3:1, and preferably flatter. A basin shelf with a minimum width of 10 feet and 1 foot deep below the normal water level is recommended to enhance wildlife habitat, reduce potential safety hazards, and improve access for long-term maintenance. d. To prevent short-circuiting, the distance between major inlets and outlets shall be maximized. 2. New storm water management ponds that are constructed as part Developers of private development shall be covered by drainage and utility easements that are dedicated to the Cit . City of Shorewood Section V -Page 7 WSB Project No. 1459-23 February 2008 SECTION V STRATEGY: REGULATION i No. Polic Target Audience 3. The City will cooperate with the MPCA and other outside City, MPCA organizations to develop Total Maximum Daily Load (TMDL) plans for the listed impaired waters that receive storm water from the City. 4. The City will require the inclusion of skimmers in the construction of Developers new pond outlets, and add skimmers to the existing system whenever feasible and practical to prevent floatables from being discharged downstream. Skimmer structures will have a minimum four-inch (4") overlap and the maximum one-year storm event discharge velocity should not exceed zero point five feet (0.5') per second. The use of skimmer structures other than wood baffles will be encouraged unless the baffle structure is properly designed. 5. The City will include provisions for coarse sedimentation and Developers skimming floatable materials prior to storm water discharge to lakes and DNR-protected wetlands. Skimmers will be designed to skim the one-year storm event. This requirement will apply in all cases except where it is deemed not feasible or not practical to do so. Considerations for variance to this policy will only be made in cases where the direct drainage area is limited in size and the probability that a significant pollutant discharge from the area to areas outside the City would be extremely unlikely. The use of skimmer structures other than wood baffles will be encouraged unless the baffle structure is properly designed. 6. The City has adopted the RPBCWD water quality goals for Silver City Staff Lake. These goals are as follows: Water Quality: TSISp=83 Recreation Goal: Canoeing and aesthetic viewing Aquatic Communities: Preserve lake's wildlife habitat Water Quantity: Manage for regional flood Wildlife: Protect existing wildlife These goals and information about the lake is included in the Silver Lake Use Attainability Analysis (May 2003) which is available in the Water Resource Library. City of Shorewood Section V -Page 8 WSB Project No. 1459-23 February 2008 SECTION V Infiltration/Volume Control 1. Abstraction via infiltration, evapotranspiration, capture, and/or reuse Developers of one inch of rainfall from the site or on a regional basis upon development or redevelopment is required for projects that increase storm water runoff volume, provided that past and existing land use practices do not have a significant potential to contaminate the storm water runoff and the soil characteristics are suitable for infiltration. 2. New development and redevelopment shall consider and Developers incorporate to the extent practical and feasible low impact development techniques that have been reviewed and approved by the City. A maintenance plan for these features will be submitted to the City for review and approval. 3. The amount of allowable impervious surfaces within new Developers development will be regulated according to the City's ordinances. 4. The City intends to use both designated and non-designated areas City, MPCA to store storm water runoff in the 100-year event. These areas include general depressions, low points, and streets where structures and/or property are not damaged and any inundation will only be temporary in nature. Wetlands 1. Wetlands will be protected within the City boundaries to assure that Developers, the value of wetlands in relation to their surface water quantity Residents benefits are not significantly impacted by development. 2. The City will encourage land owners to maintain wetlands and open Developers, space areas for the benefit of wildlife. The City will utilize the Residents Planning Commission and Land Conservation and Environment Committee members to promote this objective. 3. Effective May 1, 2008, The City of Shorewood is the Local Developers, Governmental Unit (LGU) for areas of the City within the Riley Residents Purgatory Bluff Creek Watershed District. The City will manage wetlands in conformance with Minnesota Rules Chapter 8420 as developed by the Board of Water and Soil Resources. 4. The City of Shorewood will defer the Local Governmental Unit Developers, responsible for wetland management to the Minnehaha Creek Residents Watershed District for areas of the City within MCWD jurisdiction. City of Shorewood Section V -Page 9 WSB Project No. 1459-23 February 2008 SECTION V 5. A 35-foot buffer is required around all wetlands, watercourses, and Developers, lakes upon development as outlined in the City's wetland Residents, City development ordinance in Appendix F. 6. Development within the City of Shorewood is required to conform to Developers the Wetland Development Ordinance in Appendix F. 7. The Minnehaha Creek Watershed District has developed a City Staff, Functional Assessment of Wetlands report for the wetlands within Developers the City. This assessment information will be utilized on a case-by- case basis as development is proposed. 8. Based on the Minnehaha Creek Watershed District Functional City Staff Assessment of Wetlands report, wetlands that were identified as having wetland restoration potential included the following and are shown on the map in Appendix B: D-117-23-25-003 D-117-23-33-031 D-117-23-26-008 D-117-23-33-040 D-117-23-29-002 D-117-23-33-045 D-117-23-32-018 D-117-23-33-018 D-117-23-32-020 D-117-23-34-002 D-117-23-32-037 D-117-23-35-015 D-117-23-33-029 As grants or other funding becomes available, the City will undertake projects to restore these wetlands. These wetlands could also be restored as part of a development plan. Although there is no funding source currently identified for this goal, it is included as CIP No. 15 in Table VI-1. 9. The City will complete a wetland functions and values assessment City Staff, for the wetlands within the RPBCWD. RPBCWD This is identified as No. 4 on Table VI-3. Groundwafer 1. The City will promote and coordinate with other agencies the City Staff continuation of existing groundwater monitoring, inventorying or permitting programs. 2. The City will encourage the development of spill prevention, control, City Staff, and counter measure plans that are consistent with State and/or Residents, Federal regulations. Developers This is identified as No. 11 on Table VI-3. City of Shorewood Section V -Page 10 WSB Project No. 1459-23 February 2008 SECTION V 3. The City will provide assistance to State or other governmental City Staff agencies in resolving groundwater quality problems. 4. The City will encourage preservation of wetlands, ponds and parks Residents, to encourage infiltration of precipitation in areas where land use is Developers not anticipated to adversely affect surface water runoff. 5. The City of Shorewood will cooperate with Hennepin County City Staff Environmental Health Department to insure that all unsealed or improperly abandoned wells within the watershed are properly sealed. Technical requirements for the abandonment of these wells will be in conformance with the Minnesota Department of Health Water Well Code. The costs for this are included in No. 11 on Table VI-3. 6. The City of Shorewood will work with Hennepin County to develop a City Staff wellhead protection plan in accordance with State requirements. The costs for this are included in No. 11 on Table VI-3. Erosion and Sediment Control 1. For activities that disturb one acre or more of land, the City shall Developers require the submission and implementation of a Storm Water Pollution Prevention Plan (SWPPP) in conformance with the MPCA NPDES rules to the City. These plans shall conform to the general criteria set outlined in the Minnesota Pollution Control Agency "Protecting Water Quality in Urban Areas", Surface Water Management Ordinance, and the NPDES Construction Site permit. 2. For projects that disturb 5,000 sf of land or greater, excavate or fill Developers more than 50 cubic yards, or result in more than 300 linear feet of trenching or earth disturbance, an erosion control permit from the City is required. 3. The City will conduct erosion control inspections in conformance Developers, City with the NPDES permit for all projects that require an NPDES Staff construction permit. 4. The City of Shorewood will develop and adopt an erosion and Developers, sedimentation control ordinance to be consistent with State and Residents local rules. A copy of the City's erosion ordinance will be included in Appendix F once it is available. City of Shorewood Section V -Page 11 WSB Project No. 1459-23 February 2008 SECTION V D. INTERNAL OPERATIONS The City's internal operations can have a significant impact on storm water management. This strategy is targeted primarily at the City with some areas targeted at the public and/or another agency. These policies are aimed at operation and maintenance activities associated with water resource management within the City. STRATEGY: INTERNAL OPERATIONS No. Polic Source/Rationale 1. The City will sweep the streets at least once annually and record City Staff the results. Areas that need more frequent sweeping will be swept as needed. 2. The City will inspect 20% of its storm water treatment basins, City Staff structural pollution control devices, outfalls, and ponds every year on a rotating basis. Maintenance will be conducted as necessary. The costs for this activity are included in No. 16 of Table VI-2. 3. The City prefers to use regional detention and treatment areas City Staff rather than site specific detention areas where feasible. The City recognizes that development of these areas will likely be incorporated into development activity and not initiated independently by the City. 4. The City requires as-builts of all ponding areas and designated City Staff, emergency overflows. Developers 5. The City will develop an ordinance to address illicit discharges and City Staff non-storm water discharge to the storm sewer system. 6. The City will develop a storm water management ordinance. City Staff 7. The City will maintain and update its storm sewer map, including City Staff storm sewer pipes, outfalls, ponds, conveyances, water bodies on an annual basis. The costs for this activity are included in No. 7 of Table VI-2. 8. The City will conduct visual inspections of storm water discharges City Staff on City-owned land annually and record results of inspections in conformance with the City's MS4 SWPPP. The costs for this activity are included in No. 16 of Table VI-2. City of Shorewood Section V -Page 12 WSB Project No. 1459-23 February 2008 SECTION V 9. The City will contact the MPCA State Duty Officer at 1-800-422- City Staff 0798 to report any hazardous material spills or discharges in conformance with the City's MS4 SWPPP. 10. The City will annually inspect and maintain any exposed stockpiles City Staff and storage areas on City property to prevent erosion and discharge into the storm sewer system or water body in conformance with the City's MS4 SWPPP. 11. The City will maintain and submit annual inspection reports, City Staff maintenance reports, and other needed documentation in conformance with the NPDES permit and the MCWD requirements. This will include annually reporting of the progress towards meeting the MCWD goals for reduction in annual phosphorus loading: Lake Minnetonka Watershed 50 lbs. Lake Virginia Watershed 4 lbs. Christmas Lake Watershed 3 lbs. 12. The City Staff will review and adjust as necessary mowing, City Staff fertilizing, and herbicide application practices to reduce organic and pollutant discharges to the storm sewer and water bodies. The cost for this activity is included in No. 9 on Table VI-3. 13. The City will review road salt application practices and consider City Staff alternative products as they become available. The cost for this activity is included in No. 10 on Table VI-3. 14. The City will participate, to the extent deemed necessary by the City Staff City, in TMDL studies that affect land use within its borders as these studies are completed. 15. The City will encourage homeowners with properties adjacent to Residents water resources to establish a vegetative buffer strip at the shoreline. This strip should consist of native vegetation to limit erosion and nutrient transport across the buffer strip. 16. The City will implement its NPDES Storm Water Pollution City Staff Prevention Plan (SWPPP). The SWPPP is incorporated by reference and is available in the Water Resource Library at City Hall. The costs for this activity are included in No. 19 of Table VI-2. City of Shorewood Section V -Page 13 WSB Project No. 1459-23 February 2008 SECTION V 17. The City will work with the Minnehaha Creek Watershed District and City Staff Riley Purgatory Bluff Creek Watershed District to assure adequate inspection, maintenance and repair of all ditches under their jurisdiction within the City. The costs for this activit are included in No. 16 of Table VI-2. 18. The City of Shorewood prefers the development of municipal City Staff, drainage systems whenever possible to the development of private Developers drainage systems. Design of drainage systems shall attempt to accommodate existing drainage systems including the lines. Existing drainage systems will be protected and drainage perpetuated. 19. The City will adopt the MCWD goal to reduce phosphorus loading City Staff, MCWD by 50 pounds annually within the City by enforcing the water quality regulations listed above. The City will report annually to the MCWD about the effectiveness of these BMPs and the progress made by each to reduce phosphorus loading. 20. The City will work with the MCWD to monitor shoreline conditions Residents on Christmas Lake. City of Shorewood Section V -Page 14 WSB Project No. 1459-23 February 2008 SECTION VI VI. IMPLEMENTATION PRIORITIES/IMPLEMENTATION PROGRAM Based on the information developed in Sections 111 through V, the City has developed a Water Resource Management Plan that reflects the needs and concerns of the City Council, City Staff, citizens, and the funding capabilities of the City. A prioritized listing of the studies, programs and capital improvements that have been identified as necessary to respond to the water resource needs within the City is outlined on the following tables. The City anticipates implementing at least to some extent the regulatory programs, studies, or improvements identified within this plan within the next 10 years. The City has developed a method to prioritize capital improvement projects. Athree-tiered approach has been adopted that prioritizes projects as "High", "Medium", or "Low". Prioritized projects are shown on Figure III-7. This method is based on the following criteria: High Priority: Projects meet one or more of the following criteria: • Projects with the highest Benefit relative to Project Cost. • Projects that should be completed soon to meet regulatory or permit requirements. • Projects that are needed to address significant public safety concerns. • Projects that are needed to finish or upgrade the construction of the City's storm water infrastructure system to meet long-term improvement plans. • Projects that should be constructed now so as to be in conjunction with other projects that will result in a reduction in cost or impact to the public. • Projects for which funding is now available or will be available in the next few years. Medium Priority: Projects meet one or more of the following criteria: • Projects with a high Benefit relative to Project Cost. • Projects that must be completed soon, but not immediately to meet regulatory or permit requirements. • Projects that are needed to address public safety concerns. • Projects that are needed to finish or upgrade the construction of the City's storm water infrastructure system to meet long term improvement plans, but timing for construction should be delayed to accommodate other planning or project work. • Projects that should be constructed soon and/or scheduled so as to be in conjunction with other projects that will result in a reduction in cost or impact to the public. City of Shorewood Section VI -Page 1 WSB Project No. 1459-23 March 2008 SECTION VI Low Priority: These projects meet the criteria listed above, but are not urgent, have lower Benefit to Cost Ratios, can be delayed until other work can be done at the same time, or must be delayed until funds become available. Table VI-1 contains Storm Water Capital Improvement Projects (CIP), Table VI-2 contains Storm Water Management Programs (SMP), and Table VI-3 contains Storm Water Management Studies (SMS). Table VI-4 summarizes the information from all of these tables. The costs associated with these items reflect year 2008 costs and do not take into account inflation. These tables are for planning and budgeting purposes and are considered rough estimates. It is anticipated that these cost estimates will be reviewed annually and updated as needed. 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O O O O c0 ~ C ~ ~ O C ~ ~ ~ ~ to O N O. ~ a ~ N ~p N t ~ O (0 k- U N ~ O N N O- N ~ O ~ ~ O U ~' ~ 0 U O U m .-. ~ ~ U SECTION VII VII. FINANCIAL CONSIDERATIONS Implementation of the proposed regulatory controls, programs and improvements that are identified in this plan will have a financial impact on the City. To establish how significant this impact will be, a review of the means and ability of the City to fund these controls, programs and improvements is necessary. Toward this end, please find outlined below a listing of various sources of revenue that the City will endeavor to implement the water resource management efforts outlined in this plan. For the next ten years, the capital improvement projects are estimated to cost approximately $1,108,000. The storm water management program costs are estimated at about $1,163,300. The storm water studies are estimated to cost about $206,000. Over this 10- year period, these projects, programs, and studies are estimated to cost about $2,477,300. Any projects, studies, and programs and the associated funding are subject to City Council approval. Since the proposed expenditures exceed the projected revenue, not all activities will be funded. The City will pursue grants to fund the work, where applicable. In lieu of additional funding, the City Council will prioritize the activities that are undertaken based on which projects provide the most benefit to the City. DESCRIPTION OF FUNDING SOURCE REVENUE GENERATED 1. Revenue generated by City's Storm Water Utility $195,000/year 2. Project paybacks Variable 3. Special assessments for local improvements made under the authority granted by Minnesota Statutes Variable depending on activities Chapter 429 undertaken 4. Revenue generated by Watershed Management Special Tax Districts provided for under Minnesota Variable depending on activities Statutes Chapter 473.882 undertaken 5. For projects being completed by or in cooperation with a Watershed District or Watershed Management Organization, project funds could be obtained from watershed district levies associated with their Variable depending on activities administrative funds, construction funds, preliminary undertaken funds, repair and maintenance funds or survey and data acquisition funds, as provided for in Minnesota Statutes Chapter 103D.905 6. Grant monies that may be secured from various local, regional, County, State, or Federal agencies. Variable depending on activities This would include the County, MnDOT, MPCA, the undertaken DNR and others City of Shorewood Section VII -Page 1 WSB Project No. 1459-23 February 2008 SECTION VII DESCRIPTION OF FUNDING SOURCE REVENUE GENERATED 7. Other Sources: These may be other sources of funding for storm water activities such as tax increment financing, state aid, etc. The City will Variable depending on activities continue to explore additional revenue sources as undertaken they become available. 8. Tax abatement Variable City of Shorewood Section VII -Page 2 WSB Project No. 1459-23 February 2008 PHOSPHORUS LOAD REDUCTION STUDY CITY OF SHOREWOOD MARCH 2008 Prepared by: WSB & Associates, Inc. 701 Xenia Avenue South, Suite 300 Minneapolis, MN 55416 (763) 541-4800 (763)541-1700 I hereby certify that this report was prepared by me or under my direct supervision and that I am a duly registered professional engineer under the laws of the State of Minnesota. Steven G. Gurney, PE Date Reg. No. 40497 PHOSPHORUS LOAD REDUCTION STUDY CITY OF SHOREWOOD TABLE OF CONTENTS I. INTRODUCTION AND PURPOSE IL PROCEDURES AND METHODS FOLLOWED III. DISCUSSION /EVALUATION OF RESULTS IV. RECOMMENDATION List of Tables Table 1 Annual Phosphorus Loads by Land Use Table 2 Reductions to Phosphorus Loads Already in Place Table 3 Potential BMPs and Other Operational Shategies to Meet MCWD Load Reduction Requirement List of Figures Figure 1 Location Map List of Appendices Appendix A Load Calculations for Redeveloped Properties within Shorewood PHOSPHORUS LOAD REDUCTION STUDY CITY OF SHOREWOOD TOC I. INTRODUCTION AND PURPOSE This report provides the results of a Phosphorus Loading Assessment that was completed for the City of Shorewood. This report provides the results of a very basic water quality modeling and stoi-n~water treatment analysis for systems that are in place within the City of Shorewood. The report provides the results of the assessment which has been performed to estimate the changes in annual phosphorus loadings that may have occurred from 2000 to the present. Section II provides a detailed outline of the procedures and methods that were used to perform the loading assessment and to estimate stormwater BMP treatment efficiencies. Section III presents and discusses the results of the loading assessment. PHOSPHORUS LOAD REDUCTION STUDY CITY OF SHOREWOOD I-1 II. PROCEDURES AND METHODS FOLLOWED This section of the report provides the procedures and methods followed for the loading assessment and analysis. The loading assessment estimates the changes in annual phosphorus loads for areas that were redeveloped within the City of Shorewood between 2000 and 2007. This time flame was chosen to coincide with the MCWD studies. Likewise, areas that redeveloped prior to 2000, or have not redeveloped, are not included in this study. A method based on land use has been applied to determine the change in phosphorus loadings as described in the Steps listed below. This method is sinular to that outlined in the July 1, 2005, Technical Memorandum from Wenck Associates, Inc. entitled "Methodology for HHPLS-P-Load model Application to Development of Subwatershed Rules Under Performance-Based Management." The redeveloped areas evaluated as part of this study are identified in Figure 1. A detailed description of the procedures and methods used follows: PHOSPHORUS LOAD REDUCTION STUDY CITY OF SHOREWOOD II-1 0 o 0 N W ~- 8 Z z o ~ W W 0. a w Q w a W W D w 0 z ~~ wa Qz W d' Q O~ ~F m cQ G Z O Q U O ,s~ ~g -N E- ~. Step 1. Compare 2000 and 2007 land uses. Information was gathered fiom past redevelopment reviews and fiom staff input regarding areas of the City in which stormwater improvements have been constructed since 2000. Step 2. Estimate annual phosphorus loading based on land use. The annual phosphorus loading used for this study for various land uses are summarized in Table 1. Table 1 Land Cover T e for Selection of Im enviousness Annual TP Load Ib/ac Undevelo ed Land, or Pre-develo ment H dric soils -row cro land or close rown cro land 0.259 U land soils -row cro land or close rown cro land 0.109 Forest, woodland, u land shrubland, savanna, rassland 0.014 Develo ed Land, or Post-Develo ment Rural/Residential 4-10% Im envious 0.300 Residential Low/Residential 11-25% Im envious 0.563 Residential Medium/Residential 26-50% Im envious 0.724 Residential Hi h/Residential 51-75% Im envious 1.140 Commercial 76-90% Im envious 1.288 Step 3: Compute annual phosphorus load generated by land use. The average phosphorus load generated from each land use in the pre- and post- development condition was computed based on the data gathered in Step 1 and Step 2. Annual loading is calculated using the following equation on a per acre basis: Redevelopment Size x Loading by Land Use =Total Phosphorus Load (lbs/year) Step 4: Define treatment practices and removal efficiencies employed in 1990 and present. Treatment practices and BMPs that have been constructed since 2000 were identified and evaluated for this study. Identified below is a discussion of the BMPs considered for the analysis: Stormwater Ponds This analysis considers that newly created ponds will retain 60% of TP loads prior to discharging downstream. This TP removal rate is supported by information presented in "Phosphorus Removal by Urban Runoff Detention Basins" (Walker). This document indicates that basins built to the NURP design standards that average four feet in depth provide TP removal efficiencies of 60% or greater. To be conservative, a 50% removal rate is used in this study, except where otherwise demonstrated during the design review of individual redevelopment projects. PHOSPHORUS LOAD REDUCTION STUDY CITY OF SHOREWOOD II-3 • Structural BMPs Significant structural BMPs within the City include: 1. The underground alum treatment system at Shorewood Mall, constructed in 2002 as part of the Cub Foods expansion. Further discussion of this system is presented in Section III of this study. 2. The grit chamber installed as part of the County Road 19 project. This stnlctural BMP was one part of the treatment train for the Gideon Glen demonshation project. Other BMPs In addition to storm water ponds, other BMPs may reduce volumes of runoff and pollutant loadings within the City. Some common BMPs that exist in the City are infiltration areas, sump catch basins, street sweeping, restrictions on phosphorus fertilizer, and vegetated buffers. These BMPs further reduce increases in annual runoff volumes and pollutant loading discharges that may have occurred between 2000 and 2006. PHOSPHORUS LOAD REDUCTION STUDY CITY OF SHOREWOOD II-4 III. DISCUSSION/EVALUATION OF RESULTS This section provides the results of the phosphorus load analysis that was completed as part of this study. This section also provides a description of possible methods to further reduce the phosphorus load on downstream waters. The information presented in this section was detern~ined utilizing the methods outlined in Section II of the report. Results The redeveloped areas constilicted since 2000 that have reduced the phosphorus load to downstream water bodies are shown in Table 2. Table 2 -Load Reductions for New Developments between 2000 and 2007 Post- Post- development development Pre- Load Prior Treated Load Redevelopment Area development to Treatment Load Reduction Name ac Load Ibs Ibs Ibs Ibs Subwatershed Parkview 5.88 3.3 4.3 2.1 1.1 Minnetonka Crossin Shorewood 2.2 2.4 2.7 1.1 1.3 Minnetonka Nurse Site Gideon Glen 15.8 20.4 20.4 10.2 10.2 Minnetonka ' Barrington 5.4 5.9 3.9 2.0 3.9 Minnetonka Excelsior- 2.4 3.1 3.1 1.5 1.6 Minnetonka Covenant Church Total Reduction 18.1 There were several other properties within the City of Shorewood that have been redeveloped since 2000, but were not included in Table 2. Arbor Creek and Lake Virginia Woods were two subdivisions that were created from open space. While the NURP ponds constructed for these projects provide the required treatment for the site, there is a slight increase in the phosphorus loads from each site because open space was converted. Since the MCWD load reduction allocations for each City are already based on some areas of the City being redeveloped, these developments are ignored in this study. Two other redevelopments are not included since they were constructed in landlocked basins and, therefore do not discharge downstream. These basins are identified as LMC-7 and LMC-8 in the MCWD Plan. Redevelopment in the basins includes the Bosworth Planned Unit Development and the Shorewood Mail Expansion that included the new Cub Foods building. As part of the construction of the Cub Foods store, an alum injection system was installed in the underground chamber constructed beneath the parking lot. The underground system could be utilized to reduce the phosphorus load to Lake PHOSPHORUS LOAD REDUCTION STUDY CITY OF SHOREWOOD III-1 Minnewashta and ultimately Lake Virginia, if an outlet from these landlocked basins becomes necessary. Potential Additional Load Reductions There are several options available to further reduce the phosphorus loads to each watershed. The following is a list of potential BMPs or operational procedures that could possibly be used to reduce the phosphorus load to downstream water bodies within MCWD. 1. Street Sweeping. A study completed by the Coon Creek Watershed District in June 2007 indicates that the average concentration of phosphorus in street sweepings is 215 mg per kg of sweepings (or 0.35 Ibs per ton of sweepings). Based on the City's past records, approximately 400 tons are removed annually in the spring by sweeping. If a second sweeping was added in the fall, it is estimated that an additional 200 tons will be removed. Based on 50 miles of City-maintained streets, the average phosphorus removal will be L4 pounds per mile. By sh•ategically sweeping select areas of the City (i.e. those directly tl•ibutary to the lakes targeted) the City can reach it easily meet its load reduction allocation. The This represent an additional 70 pounds of phosphorus can be reduced annually. Table 3 -Recommended Fall Sweeping Activities BMP Road Miles to Be Swe t Estimated Load Reduction Subwatershed Street Sweeping 22.9 mi 32 lbs. Lake Minnetonka Street Sweeping 2.9 mi 4 lbs. Lake Virginia Street Sweeping 2.1 mi 3 lbs. Christmas Lake Because fall sweepings collect mostly dead leaves and lawn clippings, it is likely that this reduction is under-estimated. 2. Construction of Additional NURP Ponds: Since the City is fully developed, there are limited opportunities to construct new stormwater treatment ponds. Should areas redevelop, the City will require new developments to install treatment facilities at that time. 3. Use of Active Treatment Systems: This option involves using a portable alum treatment unit to treat standing water in storm water ponds. 3. Infiltration Basins: Due to the nature of the soils in this area, this is not considered a good option; however, if a developer proposed this type of PHOSPHORUS LOAD REDUCTION STUDY CITY OF SHOREWOOD 111-2 system, the City would allow it, provided treatment to NURP standards have been demonstrated. 4. Water Reuse: A water reuse system to reuse stoimwater runoff as irrigation water in City parks may be a feasible system to reduce both runoff volume and annual phosphorus load to downstream waterbodies. The above methods are presented to demonstrate that there are potential options available to reduce phosphorus loads to downstream water bodies. PHOSPHORUS LOAD REDUCTION STUDY CITY OF SHOREWOOD III-3 IV. RECOMMENDATION Based on the results of this study, it is recommended that the City implement a fall sweeping program to target strategic areas within the City. The quantity of material removed fiom these areas will be recorded and presented as part of the City's annual SWPPP report. PHOSPHORUS LOAD REDUCTION STUDY CITY OF SHOREWOOD Iil-4 APPENDIX A Load Calculations for Redeveloped Areas within Shorewood PHOSPHORUS LOAD REDUCTION STUDY CITY OF SHOREWOOD ,. _ i 701 Xenia Avenue South, Suite 300 Project Description ~~~U'(~,G~~~~ ~~"~ ~ ~n~ ~~~~~~C i~ ,=~'""~ ~; Minneapolis, MN 55416 Project No. J ~`-`' `f t`~ °~~ Designed By [.J ,f ~ ~ ~ 763-541-4800 Task Description ~~ ~~~~~ ~%~a`7 '~~Checked By ~. ~ ' °' ~ www.wsbeng.com Page ~_ of -'' rz .:~,.. cPL Associates, Inc. ~_ t ~ ~- ~~F'r~~ ~. °es~~~ €..~ c' ~_~ v p a <~°z ? ,_, ~~%~ i~ wry ._ ~ ~ ~ ; ~ r. 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'~ ~ ~ ~ '^~ < (r __ _ 701 Xenia Avenue South, Suite 300 Project Description t~ Minneapolis, MN 55416 Project No. ~' ~=' ` ~= =~ Designed By ~`„ _ ~ ~'~~ s,}~ 763-541-4800 Task Description Checked By .- . _ www.wsbeng.com Page ~' of -~ & Associates, Inc. ~ ~ ~ C. ~ ~r~fil f"tr ~~~z c( _' ~ ~r~I ~-°'.~~(`...~ ~=. ~t".:3.~j~'>~i'" ~./-J~c°c.>a-7J 7 C:~ ;~' . r~ G.-.mot`, C,`` ( /L l ~/" ('f" <. ~t ~ e; ice, -~ //,~,~ ~ ~~ 9 ~ ~_~ ~1 ~ i rat r'' r" ! rat ~ :~~~ «-~ ~~ ~i] ~c-' .~. ~~;~, c~ r~ (~ ~, ,~.,~_~~.-~~`. f 5' . c~ ~ _~ I (J r~i /~' ~";;:t<~`^~ ~ly°,. ~ r d ~~ i.~t~- / /~:v l !1 ~ ~...7~a`"a'=,~- ...(~~~:~d °~ (~ „+~ t-!;~ :'_',~?rt./~ ~. ~ ~ ._~ ~Q ~ v' ~ v `~ '' u'" Cam' ! ~_ ~ tJ ,f'~ ~~r~ l ~~~~~c~~~ `Cn ~^ ~ ~ ~x j~c~1 ~, r ~ /~~: ~~~y ,- _:_ -, ~;. F<„ 701 Xenia Avenue South, Suite 300 Project Description ' ; ~ ,r,; Minneapolis, MN 55416 Project Na _ /~-~ _' '~~ Designed By ~ ~~ i 763-541-4800 Task Description Checked By Pa e ~ ~ ~~. ~~' ~_ , www.wsbeng.com g -~- of & Associates, Inc. \ r .w, / p / fP ~ ~e7 a .-~ °_~j~~" t~ (~~'C ~ f'.~ ~-~91 °'°' L't_ f%~6~ i'fP a!~ c-^7 4 r ~~ ~~~ ~~ ~~~~_ ~~ r ~~ ~~~^~~ /-y 93 ,pt /Ci'l GL ~ i C~~y''~bJC` `i,~ ~<<J F 1~~"t f' ~` ~ ~.~. f ~ ~ ~ ~~`~'~ f ~~` `I" 5755 COUNTRY CLUB ROAD • SHOREWOOD, MINNESOTA 55331-8927 • (952) 474-3236 FAX (952) 474-0128 • www.ci.shorewood.mn.us • cityhall@ci.shorewood.mn.us MEMORANDUM TO: Mayor and City Council FROM: Larry Brown, Acting City Administrator DATE: March 6, 2008 RE: Discussion Regarding Storm Water Policies and Practices Attachment 1 is correspondence received by Councilmember Wellens regarding storm water policies and practices. It was recommended by staff that this be placed on a work session agenda, such that a full discussion by the City Council could take place for this issue. ~~m. as :.«~ PRINTED ON RECYCLED PAPER Page 1 of 1 Larry Brown From: Martin Wellens [m.wellens@mchsi.com] Sent: Thursday, February 14, 2008 9:54 AM To: 1-Brown Larry; 1-Brad Nielson home; jlandini@ci.shorewood.mn.us Cc: 'Craig Dawson' Subject: Storm-water Greetings Gentlemen, With respect to all Mr. Johnson's emails, we will need to have some frank discussions about these new watershed powers and designated vs. undesignated holding areas. Any City Council must fully accept that storm water must go somewhere. My concern is that the city operate with justice in mind and we pay for what we take or destroy. The goal is not to avoid liability or costs. I could be dead wrong, but my intuition tells me you guys might have that in mind and are trying to protect the council and city. If a city designs its storm drainage system so that during a 10-yr storm we dump it all in Mr. Nielsen's back yard, Council needs to know. If by not designating the Nielsen property as a holding area, we escape responsibility and dodge a "takings" lawsuit, the Council needs to know of our tactics. So I hope you will get these proposals to us with plenty of time for review. And please have all the incorporated reference materials on hand for scrutiny. I don't think you will find the council repeating "approval by reference" (as we did with the state fire code). Thank you. Enjoy the snow!! Martin R. Wellens 4755 Lakeway Terrace Shorewood, MN 55331-9367 3/6/2008