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Anctx A ANOKA CONSERVATION DISTRICT <br /> 1318 McKay NE, <br /> ;ONSERVATION Ham Lake, MNrive 55304 Suite 300 <br /> DISTRICT Phone: (763)434-2030 Fax: (763)434-2094 <br /> www.AnokaSWCD.org <br /> MEMORANDUM <br /> TO: RCWD Board of Managers and Citizen Advisory Committee <br /> FROM: Mitch Haustein, Stormwater and Shoreland Specialist <br /> DATE: February 23, 2018 <br /> SUBJECT: Water Quality Grant Program Application — Centerville Lake Shoreline <br /> Stabilization, Trail Side Park— Phase 2, Centerville <br /> The following summarizes the RCWD <br /> Water Quality Grant Program application to N <br /> cost-share the installation of a 328' - 0 250500 1,000 1.500 A <br /> m Feet <br /> shoreline stabilization using riprap and <br /> native vegetation along the east side of <br /> Centerville Lake. This Phase 2 project is a <br /> southern continuation of the Phase 1 <br /> RCWD Water Quality Grant Program _ <br /> project (A17-08) that is expected to be Project Area <br /> installed in the spring of 2018. The City of <br /> Centerville is hoping to pair this project <br /> with Phase 1 in order to capitalize on a --�_ <br /> favorable bid from Phase 1. The low bidder ' <br /> from Phase 1 has agreed to honor the unit <br /> prices for Phase 2. <br /> PROJECT DESCRIPTION j`= Anoka County <br /> Trail Side Park Phase 2 is located on two <br /> properties along the east side of WpAma <br /> Centerville Lake, west of Main St. in o <br /> Centerville (see map to right). Both <br /> properties are owned by the City of <br /> Centerville. This project includes 328' of <br /> actively eroding shoreline. <br /> Natural wave action and wakes from boat traffic are the primary causes of erosion. Sediment and <br /> nutrients from the eroding shoreline directly enter Centerville Lake, which is part of the Rice Creek <br /> Chain of Lakes. Additionally, a sanitary sewer main is at risk of exposure if erosion continues. <br /> The 328' project is divded into north and south zones based on a difference in lakeshore bank height. <br /> Because the south zone banks are taller, the south zone will require more riprap than the north zone in <br /> order to achieve a stable slope. <br /> North Zone (Approximately 179 ) - This zone is characterized by steep shoreline slopes <br /> (about 2:1). The crown of the shoreline is about 2.5' above the OHWL and then the topography <br /> flattens into about a 20' wide bench. Shoreline erosion has undercut this area, resulting in steep <br /> 14 <br />