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3. S<»dtmentation Basins <br />a. County R(ad 6 Basin <br />The strojn monitored at site S-3 is Lhe major tributary to Long Lalce and <br />concibutcs about 80 percent of the lake’s external phosphorus load. <br />Monitoring indicated that le\els of phosphorus and sediments were relatively <br />high at stream site S-3, where this stream passes under County Road 6 prior to <br />discharging to the lake. <br />A sedimentacon basin will be created at this site to reduce sediment and <br />nutrient loadinp. The basin will be created in subwatershed LLC-7 just north <br />of County Road 6 (Figure 6). Approximately 10.0 acres of land will be <br />required to create the 8.0-acre basin, and some 174,000 cubic yards of soil will <br />be removed to achieve an aveiage depth of 11.5 feet. <br />Once created, the peripheral ara will be sodded to stabilize it and improve <br />aesthetics. Indigenous wetland trees and shrubs will also be planted around the <br />basin perimeter, <br />b. Deer Hill Road Basin <br />The stream monitored at site S-1 is one of the two major branches of the site S-3 <br />5tream, and contributes more than 60 percent oi the laser’s phosphorus loading. <br />Therefore, a sedimentation basin will be created on this stream near Deer Hill Road <br />(Figure 6). Approximately 6.0 acres of land will be required to create this 4.0-acre, <br />10.0-foot deep basin, and 76,500 cubic yards of soil will be removed.