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Revised 1/11/80 <br />M Section 816.46(a) Continued <br />the first year of reclamation. This corresponds to readings 0 to <br />60 days old, and is also conservative beyond 60 days. Any areas <br />which were still bare were assigned 1.0. This would correspond to <br />a freshly disked bare soil, which is conservative for any reclama- <br />tion practice which tends to decrease sediment yield, such as <br />contour plowing. <br />At the Eclanan Park site values of 1.0 and 0.05 only were used, <br />since in the worst case yeaz of 1960, which was used in the hydro- <br />logic analysis, there was no first yeaz reclamation. This will <br />slightly overestimate the sediment volume, as the average 1980 <br />sediment yield multiplied by 3 would be higher than the total of <br />the actual yields for 1980, 1981 and 1982. <br />All three values of VM wore used on the other ponds, because sev- <br />eral stages of reclamation and soil disturbance existed. This <br />approach is not more or less ~nservative than the Pond A calcula- <br />tion, as each calculation was performed to reflect, as accurately <br />as possible, the conditions at each pond. <br />The year 1980 was selected because the tributary area was the <br />lazgest in that year, and 1980 had the highest SCS ~rve Number of <br />the years investigated. The yeazs investigated were the ones which <br />LRC1~ believed would produce the greatest runoff volume. <br /> <br />Exhibit Sp 816-45(c) 12/13199 <br />