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IV <br /> <br />Define SCS Curve Numbers <br />Using field observation by mine personnel, a revegetation schedule as shown <br />below was developed for reclaimed land. The schedule shows expected plant <br />cover for each year after a part-ipular location has been reclaimed. <br />First Year of Growth - 'Ol; cover <br />Second Year of Growth - 15% cover <br />Third Year of Growth - 40% cover <br />Fourth Year of Growth - 60% cover <br />• <br />The vegetation was assumed to be primarily sagebrush and grasses, and no <br />more than 60% cover was anticipated at any time. <br />Annual curve numbers were developed by determining the ground cover for <br />each year in each mining block as it was disturbed, mined and reclaimed. <br />The curve numbers were taken from Fig. 5-3, pg. 19, reference number 2 <br />assuming a "D" type soil. It was assumed that reseeding would begin the <br />year after mining and that all runoff from the active mining area would <br />flow directly into the pond. However, actual operating practices call for <br />the runoff from the pit area to be held in the bottom of the pit until <br />there is room available in the sediment pond. Therefore, the runoff into <br />the pond will be less than shown in Table 1. <br />• <br />