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MANAGEMENT OPTIONS FOR BENNETT LAKE <br />Bennett Lake has multiple, systemic management challenges and will likely require a <br />considerable commitment of resources to achieve noticeable improvements in water quality. The <br />options presented below are made based on what we know about the system now (Table 5.5). It <br />may make sense for the City to pursue Phase 1 management options now, but consider a more <br />detailed technical assessment of the lake and its watershed to evaluate the specific costs, benefits, <br />and feasibility of structural measures to decrease the pollutant loading to the lake. Outside <br />sources of funding to support this effort may be available through MPCA's Clean Water <br />Partnership Program and the Grass Lake Watershed Management Organization. <br />Table 5.5 — Management options matrix for Bennett Lake <br />Activity <br />Phase <br />Estimated Cost <br />Comments <br />Targeted street- <br />1 <br />$150 /street mile <br />Sweep direct drainage In March /early April, <br />sweeping <br />June, October/November, remainder of <br />drainage as budget allows <br />Soil phosphorus <br />1 <br />$400 -600 in <br />Top priority are maintained areas of Central <br />testing <br />analytical costs <br />Park and residential areas in direct drainage. <br />for 50 -80 <br />Other areas as funds and time allow. <br />samples <br />Promotion of no- <br />1 <br />$500 <br />Target areas where soil tests show no P <br />phosphorus <br />necessary. Can work through vendors and /or <br />fertilizer use <br />volunteer groups. <br />Stocking of <br />1 <br />N/A <br />Continue working with MN DNR to stock <br />piscivorous fish <br />large predatory fish in order to try to reduce <br />number of small fish that feed on large <br />zooplankton. Grazing on algae by large <br />zooplankton can help keep algal blooms in <br />check. <br />In -lake <br />1 <br />$15 - $1,000 /yr <br />Monitoring should be conducted bi- weekly <br />monitoring <br />throughout May - September period. Go with <br />continued monitoring by Capitol Regions <br />Watershed District (CRWD), if possible. If <br />not, low cost option is participation in <br />MPCA's Clean Lake Monitoring Program <br />(CLMP) (water clarity only). Higher cost <br />option is participation in Met Council's <br />Citizen Assisted Monitoring Program <br />(CAMP). <br />(Table continues) <br />City of Roseville 57 <br />Parks Natural Resource Management <br />