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Detention Sumps <br />The bench in the North Pit will be reduced to a width of 30 feet for reclamation, and the bench itself <br />and all areas above it will drain to two sumps, as shown on the Hydrology Map. These two sumps <br />aze called Upper Sump 1 and Upper Sump 2. The north bench and the disturbed slope above it will <br />drain to the North Pit access road and road ditch A small sediment sump (Lower Sump) will be <br />installed to collect the runoff from the 100 yeaz event for the 1.13 acre downspoiled azea that does <br />not drain to any other sediment facility. <br />TR09, TRll (v1.0) 5-11 Revised 3/98, 8/02 <br />