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January 26,2024 <br /> Don Peterson <br /> Page 2 of 21 <br /> Reference: Water Quality Assessment of Silver View Pond,Mounds View,MN <br /> Aquatic Vegetation <br /> To assess the presence, abundance, and health of the lake's aquatic vegetation community, Stantec <br /> surveyed the aquatic plant communities in Silver View Pond on 6/27/2023 and 6/28/2023 (early season) <br /> and on 8/31/2023 (late season). Each lake was surveyed at distinct locations across a grid using the point- <br /> intercept methods described in Madsen (1999).1 <br /> During each point-intercept survey, all submerged, floating leaf, and emergent species were identified at <br /> each survey point. Surveys were conducted at two periods in the summer growing season to account for <br /> different life cycles of commonly found aquatic native and invasive species in Minnesota. <br /> At each survey location a double-sided, weighted 14-tine rake was thrown from the boat, allowed to sink, <br /> and pulled across the lake bottom to represent approximately 1 square meter of lake area. We refer to this <br /> process as a rake toss. For each rake toss, vegetation was removed from the rake and identified to the <br /> species level. <br /> Sediment Chemistry <br /> Sediment cores were collected on 9/6/2023 from three locations in Silver View Pond, as shown in Figure 1. <br /> Sediment cores were collected for two purposes. The first was for laboratory incubation to quantify <br /> sediment phosphorus release rates under oxic and anoxic conditions. Sediments were incubated at UW- <br /> Stout under temperature-and light-controlled conditions. The second analysis was for phosphorus <br /> fractionation to quantify the mobile and non-mobile pools of phosphorus. Each core was sectioned into two <br /> depth intervals (0-5 and 5-10 cm depth intervals)for phosphorus fractionation analysis (Table 1) and <br /> sediment characteristics(i.e., moisture content, bulk density, and percent organic matter). The purpose of <br /> this analysis was to quantify the pools of P that are subject to diffusion from the sediments and characterize <br /> the areal extent of potential internal P loads to determine the feasibility of an alum treatment to suppress <br /> internal P loads. <br /> 1 Madsen, J.D. 1999. Point intercept and line intercept methods for aquatic plant management.APCRT <br /> Technical Notes Collection. U.S.Army Engineer Research and Development Center, Vicksburg, <br /> MS <br /> Design with community in mind <br />