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• science, and since there is a change in grade at the sites from <br />i the relatively steep slopes to the mildly sloped areas before the <br />sediment ponds, the above sediment delivery ratios will be <br />further reduced by 15~. This makes the estimate of sediment <br />delivery for the pre-mining condition lower. <br />Using these sediment delivery ratios and the other parameters <br />described above, the calculations for the USLE are as shown <br />below: <br />Site R K LS C P SDL Tons/Ac Acres Tons r sow I <br />Rienau #2 26 .283 17.15 .066 1 55% 4.58 2.35 10.76 I~ g~ <br />26 .283 3.15 .066 1 55~ 0.84 2.68 2.25 v.~° <br /> Total 5 03 13 01 13.6$ <br /> <br />North. #1 26 <br />.270 <br />11.31 <br />.058 <br />1 <br />45`.5 <br />2.07 <br />1.22 <br />2.52 I <br />Sv'- i <br />26 .270 3.65 .058 1 45`5 0.67 4.28 2.87 ` ~'° <br />. 26 .270 14.50 .058 1 45A4 2.66 4.36 11.60 <br />26 .270 5.95 .058 1 4555 1.09 1.84 2.01 i <br /> Total 11.70 19 00 y~ '` <br />Refuse 26 .240 5.57 .066 1 49~ 1.12 2.24 2.51 <br />26 .240 1.64 .066 1 49~ 0.33 1.84 0.61 <br /> Total 4 08-- ---3.11 6.'S5, <br />SCS "T: Values for Soil Erosion <br />The Soil Conservation Service has developed a "T" value for each <br />soil which is defined as the maximum annual rate of soil erosion <br />by wind or water that can occur without affecting crop <br />• <br />m-~ZS <br />~~RO ~?3 <br />