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BLUE RIBBON MINE <br />FINAL BOND RELEASE <br />SUPPLEMENTAL INFORMATION <br />1. Reclamation and Management History: The disturbed areas associated with the <br />Blue Ribbon Mine were reclaimed during 1985 and 1986. In the fall of 1985 the <br />face of the mine bench was seeded and mulched. In the fall of 1986 the <br />remainder of the mine site was seeded and mulched. During 1988 and 1989 two <br />small unstable areas on the face of the mine bench were repaired, seeded and <br />mulched. During 1993 two areas of the bench face slumped. Both areas were <br />repaired, seeded and mulched during 1993. No augmented seeding, fertilizing or <br />irrigation has occurred at the site since 1993. <br />The management history entails some ditch and culvert maintenance, pond <br />maintenance, noxious weed control and minor rill and gully repairs. There were <br />some minor rills repaired on the outslope of the lower bench. <br />2. Topsoil: Topsoil was not completely salvaged at the Blue Ribbon Mine. Much of <br />the mine site was disturbed pre-law; therefore, no obligation existed to salvage <br />topsoil. Soil amendments were used to achieve a suitable plant medium. After <br />the mine site was regraded, five soil samples were obtained and submitted for <br />chemical and physical analyses on August 28, 1986. The salinity levels and <br />sodium adsorption ratios were low. SAR values were less than 6.15 and EC <br />values were less than 1.27 mmhos/cm. The soil fertility levels showed low <br />nitrate-nitrogen and phosphorus levels, and adequate levels of all other fertilizer <br />components. The texture of 3 of the soil samples was silty clay loam and 2 of silt <br />loam. The fine texture of the soil may present a problem on steep slopes where <br />gullying and ruling could occur during a heavy rainstorm. For this reason, <br />mulching and netting were performed after planting. In order to assist the newly <br />planted vegetation to establish in the soil, the following fertilizer amendments <br />were worked into the upper several inches of the soil: <br />100 pounds per acre of 18-46-0; (18 pounds N, 46 pounds P205) <br />50 pounds per acre ammonium sulfate; (10 pounds N) <br />3. Total Suspended Solids: A soils loss comparison of the reclaimed versus the <br />original conditions is attached. The calculation demonstrates that untreated <br />drainage from the reclaimed area will contribute fewer suspended solids to <br />1 of 3 7/08