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Existing Infrastructure Protection <br /> Shoreline stabilization will provide protection for the sanitary sewer line that is at risk of near-term <br /> failure if shoreland erosion continues. <br /> Recreational Use <br /> Shoreline stabilization within Trail Side Park will provide continued access to Centerville Lake for <br /> community events and general recreational use by the public. <br /> ESTIMATED POLLUTANT REDUCTIONS <br /> Pollutant reductions were estimated using the Wisconsin NRCS Direct Volume Method in conjunction <br /> with BWSR's pollution reduction calculator for stream and ditch erosion. Erosion severity along the <br /> shoreline was classified as `severe' because the bank is predominantly bare, with exposed tree roots <br /> and fallen trees (see site pictures at end of memorandum). Based on this determination, the lateral <br /> recession rate was estimated to be 0.3 ft/yr, which is on the low end of the `severe' range (0.3 - 0.5 <br /> ft/yr). Assuming sandy soils, the estimated soil loss from this 328' stretch of bank with an average 3' <br /> eroding face is approximately 16.2 tons per year. This results in an estimated 13.8 pounds of total <br /> phosphorus contributed to Centerville Lake and downstream waterbodies annually. Stabilization of the <br /> bank will result in 100 percent reductions in these estimated pollutant loads. <br /> ELIGIBLE EXPENSES AND REQUESTED FUNDING <br /> The grant request outlined in this section is based on Shoreline Landscaping's unit prices from Phase <br /> 1. Shoreline Landscaping was the low bidder from Phase 1 and has agreed to honor Phase 1 prices for <br /> the Phase 2 project. See attached Phase 1 quote form from Shoreline Landscaping for additional detail. <br /> Phase 2 Cost Estimates <br /> Traprock <br /> Item Unit Estimated UnitExtended Notes <br /> Quantity price Amount <br /> Class III riprap (9"-18" diameter, as Includes <br /> specified in MNDOT 3601) CY 163 $90.00 $14,670.00 10% quantity <br /> contingency <br /> 12.5 ft wide Type IV Non-Woven Includes <br /> Geotextile Fabric (Propex Geotex LF 394 $2.00 $788.00 20% quantity <br /> 801, or equivalent) contingency <br /> Site restoration LS 1 $2,250.00 $2,250.00 <br /> Red Osier Dogwood (Cornus sericea) EACH 29 $18.00 $522.00 <br /> 1 Gallon <br /> Total $18,230.00 <br /> Fieldstone(River Rock)Alternative <br /> Item Unit Estimated Unit' Extended Nates <br /> Quantity price Amount <br /> Class III riprap (9"-18"diameter River Includes <br /> Rock CY 163 $120.00 $19,560.00 10% quantity <br /> contingency <br /> 12.5 ft wide Type IV Non-Woven Includes <br /> Geotextile Fabric (Propex Geotex LF 394 $2.00 $788.00 20% quantity <br /> 801, or equivalent) contingency <br /> Site restoration LS 1 $2,250.00 $2,250.00 <br /> Red Osier Dogwood (Cornus sericea) EACH 29 $18.00 $522.00 <br /> 1 Gallon <br /> Total $23,120.00 <br /> Page 3 of 6 <br /> 16 <br />