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Mr. Richard Atkinson <br />• May 14, 1981 <br />Page Three <br />Reviewing the reference "Agricultural Handbook No. 537" USDA, 1978, <br />recommended in The Adequacy Review, we concur that this reference is better <br />for selection of the C factor as additional factors such as land slope and slope <br />length limits are conssdered. From the tables 9 and 10 of this reference we <br />then selected these values of ES: <br />Condition CS <br />Area being reclaimed <br />Sfraw mu c T/acre, on slopes 26% to 33% 0.17 <br />Undisturbed and fully restored area <br />No apprecia a mnopy, grass, 80% ground cover 0.013 <br />Average condition in area being reclaimed <br />Average between straw mu ched area and fully <br />restored area equa I to 50% (0.17 + 0.013) 0.092 <br />• Next the mining and reclamation operations were reviewed and the proportions <br />of the areas under reclamation and undisturbed or fully reclaimed were estimated <br />for Streeter Gulch and Gulch A. (Taylor Gulch was not estimated as mining pro- <br />gression through this area is scheduled for after the year 2000, and therefore not of <br />immediate concern.) The results are as listed: <br />Area (aces) <br />Areas Disturbed Undistur ed Disturbed Undistur ed <br />and and under or and under or <br />Years reclamation(1) fully reclaimed reclamation fully reclaimed <br />Sfreeter Gulch (1367a) <br />981-1986 139 1228 10.2 89.8 <br />1986-1991 181 1186 13.2 86.8 <br />1991-1996 112 1255 8.2 91.8 <br />1996-1999 41 1326 3.0 97.0 <br />Av = 8.6 Av = 91.4 <br />Gulch A (667a) <br />1981-1986 14 653 2.1 97.9 <br />1986-1991 76 591 11.4 88.6 <br />1991-1996 167 500 25.0 75.0 <br />1996-1999 155 512 23.2 76.8 <br /> Av = 15.4 Av = 84.6 <br />• (1) Assuming 5 years from first disturbance of an area <br />until area fully reclaimed <br />