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AN*XA ANOKA CONSERVATION DISTRICT <br /> 1318 McKay Drive NE, Suite 300 <br /> ON RVAIN Ham Lake, MN 55304 <br /> B' TRI1 Phone: (763)434-2030 Fax: (763)434-2094 <br /> oma~ www.AnokaSWCD.org <br /> MEMORANDUM <br /> TO: RCWD Board of Managers <br /> FROM: Mitch Haustein, Stormwater and Shoreland Specialist <br /> DATE: November 17, 2017 <br /> SUBJECT: Water Quality Grant Program Application — Centerville Lake Shoreline <br /> Stabilization, Trail Side Park, Centerville <br /> The following summarizes the RCWD <br /> Water Quality Grant Program application to . <br /> cost-share the installation of a shorelineF- }t <br /> stabilization using riprap and native <br /> vegetation at the Trail Side Park property ply . <br /> on Centerville Lake in Centerville. ' , <br /> PROJECT DESCRIPTION P��eS�.�t�rw <br /> The Trail Side Park property <br /> is located on ' ect Area <br /> the east side of Centerville Lake, along the <br /> t. <br /> west side of Main St. in Centerville (see <br /> map to right). Approximately 350' of <br /> shoreline is actively eroding. Natural wave <br /> t <br /> action and wakes from boat traffic are the <br /> primary causes of erosion. Sediment and <br /> nutrients from the eroding shoreline directly i <br /> enter Centerville Lake, which is part of the is <br /> Anoka County <br /> Rice Creek Chain of Lakes. Additionally, a <br /> is <br /> sanitary sewer main within the park is at <br /> MspAma} <br /> risk of exposure if erosion continues. <br /> For this project, the 350' shoreline is i ..' . <br /> divided into north and south zones based <br /> on the shoreline topography. <br /> North Zone (Approximately 165') - This zone is characterized by relatively steep shoreline <br /> slopes (about 2:1). Currently, these upland slopes are slumping into Centerville Lake as a <br /> result of wave action undercutting the toe of the slope. Generally, these slumping soil areas are <br /> four to six feet high. The north zone shoreline slopes consist of sandy soils being held in place <br /> by weedy forbs and grasses with relatively shallow root systems. The continued erosion of <br /> these slopes threatens a paved regional bike path (about 12' east of the OHWL) and Main St <br /> (about 30' east of the OHWL). <br /> South Zone (Approximately 185') - The south zone is characterized by an approximately 20' <br /> wide level area below a steep slope leading up to a bike path and Main St. Shoreline erosion <br /> has undercut this level area, resulting in two to three foot high vertical shoreline banks. This <br /> 74 <br />