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• contour furrowing system is the best ezample of on-site sediment <br />control and reduces the need of additional sediment control <br />measures. A detailed discasaion on seeding, planting, contour <br />furrowing and revegetation is set forth under Bule 2.05.4. <br />Diversion structures are planned at the locations shown on Nap <br />20, Permanent Sediment Control Plan, and will serve to divert eater <br />from tmdisturbed areas away Eram disturbed areas, and from disturbed <br />areas into sediment control facilities. Not only will this <br />diversion system reduce the amount of water flowing across disturbed <br />areas and thus reduce water velocity and sediment yield, it will <br />also reduce the size sad number of sedimentation ponds required. <br />The diversion structures are designed and will be constructed and <br />• maintained to handle the amount of runoff from at least the 2-year, <br />24-hour precipitation event and will prevent additional <br />contributions of suspended solids to stream flow outside the <br />proposed permit area. <br />Strategic placement of small detention s~mmpa ie another <br />important measure which will be utilized to reduce runoff and <br />sediment yield. The sumps are shown on Map 20, Permanent Sediment <br />Control Plan. The sumps have been Located where needed to provide <br />local sediment control. These sumps are particularly useful in the <br />very confined area where County Boad 33, Middle Creek and the <br />haulroad converge as show on Map 20, Permanent Sediment Control <br />• Plan. The sumps will be small, in all cases leas than 10 feet in <br />2.05 - 142 <br />