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Nell( A Anoka Conservation District <br />16015 Central Ave NE Suite 103 <br />CONSERVATION Ham Lake, Minnesota 55304 <br />DISTRICT Ph. 763- 434 -2030 Fx. 763- 434 -2094 <br />www.AnokaSWCD.org <br />RICE LAKE STORMWATER RETROFIT PROPOSAL Updated 1/13/09 <br />TARGET WATERBODY <br />Rice Lake <br />Rice Lake serves as drainage to areas of residential development that have significant amounts of <br />impervious surfaces. The high volume of runoff from these surfaces transports sediments and <br />pollutants into the lake, which also impacts the water quality of Baldwin Lake and Rice Creek. The <br />purpose of this project is to improve stormwater quality and reduce the volume of runoff entering the <br />stormwater system from neighborhoods that most greatly contribute to the degradation of Rice Lake. <br />We can do this most efficiently by forming a partnership combining technical expertise from the Anoka <br />Conservation District with project funding from the Rice Creek Watershed District to prioritize <br />neighborhoods and projects. This partnership will ensure measurable results that will meet the goals of <br />the Watershed District. <br />TASKS <br />STORMWATER RETROFITTING PROCESS* <br />STEP AND PURPOSE <br />KEY TASKS <br />PHASE 1: FEASIBILITY <br />Step 1: Retrofit Scoping <br />Refine the retrofit strategy to meet local restoration <br />objectives <br />• Screen for subwatershed retrofit <br />potential <br />• Review current and future stormwater <br />plans <br />• Define core retrofitting objectives <br />• Define preferred retrofit treatment <br />options <br />Step 2: Desktop Retrofit Analysis <br />Search for potential retrofit sites across the <br />subwatershed <br />• Secure GIS and other mapping <br />• Conduct desktop search for retrofit <br />sites <br />• Prepare base maps for RRI <br />Step 3: Retrofit Reconnaissance Investigation <br />(RRI) <br />Investigate feasibility of retrofit sites in the field <br />• Advanced preparation <br />• Evaluate individual sites during RRI <br />• Finalize RRI sheets back in office <br />Step 4: Retrofit Evaluation and Ranking <br />Choose the most feasible and cost - effective sites <br />• Neighborhood consultation <br />• Develop retrofit screening criteria <br />• Create retrofit project priority list <br />Step 5: Subwatershed Treatment Analysis <br />Determine if retrofits can achieve subwatershed <br />restoration objective <br />• Compute pollutant removal by <br />storage retrofits <br />• Compute pollutant removal by on -site <br />retrofits <br />• Compare against restoration <br />objective <br />Step 6: Finalize Designs <br />Assemble design package to lead to successful <br />retrofit construction <br />• Obtain landowner approval <br />• Conduct bidding for construction <br />• Put together final design package <br />