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-20- Receiving Stream Percent Detention Bolton Draw 18.9% Bush Draw 5.4% Williams Draw 17,4% Sudduth Draw 2,9% Mann Draw 4.0% Canadian River 0,32% This effect would be temporary, and would cease when sediment ponds are removed. Following reclamation, the disturbed sites will, fora short period o ime, a suscep i le to erosion, and will temporarily increase runoff rates. These problems are rectified with time as the reseeded areas develop with plant root growth and the fresh topsoil becomes settled and stabilized. Contour furrowing and plowing will be used to retain water from precipitation as much as possible within seeded areas during reclamation, and will also reduce erosion, During the early years following reclamation, all of the runoff should be retained by the contour furrows. At the end of the bonding period, vegetative cover wi]1 be established and the topsoil will be stabilized, and contour furrows and sediment ponds will no longer be needed to retain runoff. At this point, the runoff from the reclaimed surface will drain unrestricted into the receiving streams. The estimated increase of flow in receiving streams is presented below and is based upon a 35% increase in runoff from disturbed sites, Receiving Streams Bolton Draw Bush Draw Williams Draw Sudduth Draw Mann Draw Canadian River Percent Yield Increases 6,5% 0,3% 1,2% 0,4% 4,8% 0,09% These represent a worst case condition. Any actual increase would probably be less. The sediment pond effluent limitation on total suspended solids is set at 70 mg/i by NPDES standards. This effluent limitation will have the effect of requiring the three mining operations to release water which is actually lower in sediment load than natural baseline levels.