12/16/2009 Env Bd Packet - Laserfiche WebLink

Home Search

• Item 5C Introduction To The Rice Lake Subwatershed Study Minutes From the February 25th 2009 Environmental Board Meeting The Rice Creek Watershed and Anoka Conservation District Introduced the Rice Lake Subwatershed study at the February 25th, 2009 Environmental Board. I believe we are through step 4 of this study and the findings were presented to the December 9th RCWD Board. Rice Creek Watershed District and Anoka Conservation District are here tonight to discuss the findings of the study. Mr. Nate Zwonitzer from Anoka County Conservation District gave a presentation to the Environmental Board members on the Rice Lake Stormwater Retrofit Proposal. Retrofit Goals consist of: Reducing the volume and pollutant load entering water body of concern. Identify pollutant "hot- spots" within subwatershed: Prioritize neighborhoods and project sites to maximize treatment per dollar spent and to install retrofit projects. Ms. O'Dea questioned why we want to reduce water. Mr. Zwonitzer stated when you introduce impervious surfaces through new developments, we want to change the way the water travels, not reduce it. • Step 1: Retrofit Scoping = Screen for retrofit potential, define retrofitting objectives and identify preferred treatment options. • Step 2: Desktop Retrofit Analysis = Gather maps of stormwater practices, conduct desktop search for retrofit sites and Prepare base maps. Step 3: Retrofit Reconnaissance Investigation = Verify stormwater mapping and Investigate Feasibility of Retrofit Sites. Step 4: Retrofit Evaluation and Ranking = Compute volume and pollutant reductions, compare results with restoration objectives and rank retrofit projects according to effectiveness and cost. Step 5: Subwatershed Treatment Analysis = (Evaluation and Ranking) Conduct neighborhood consultations, develop retrofit screening criteria and create retrofit project priority list. Step 6: Finalize Designs = Obtain landowner approval, conduct bidding for construction and assemble design packages. Step 7: Construction: Oversee BMP Installation. Conduct pre- construction meetings and Inspect construction progress. Attachment 1