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The area is a small upland portion (less than 4%) of the watershed serviced by the Center Ridge pond. It does not contain any drainage structures nor is there any evidence of erosional instability. Due to the relatively porous nature of the soil surface, it is doubtful this area contributes significantly to surface water runoff which passes through the Center Ridge pond. Water quality data collected at the Center Ridge pond and along Trout Creek has remained consistent with the projections described in the Probable Hydrologic Consequences section of the permit. Center Ridae -Center Ridge was mined and reclaimed under the federal Surface Mining Control and Reclamation Act (SMCRA; P.L. 95-87) Interim Regulations and under the Colorado Mined Land Reclamation Act (CMLRA) Regulations (effective May, 1977). However, a portion of the azea did not undergo final grading and seeding until after the promulgation of the Colorado Surface Mining Reclamation Act (CSMRA) Regulations (effective August 30, 1980). Therefore, this portion of Center Ridge was included in the estimation of the reclamation liability bond associated with Permit C-80-001. As in the case of East Ridge, quantitative revegetation success parameters for Center Ridge were not required. However, more favorable vegetation cover was present on Center Ridge during a previous bond release for the remainder of the area. The vegetation cover on Center Ridge at the time of the previous bond release was 42%. Therefore, it was mutually agreed by P&M and the CDMG that the minimum vegetative cover value for determining revegetation success would be established at 42%. Total absolute vegetation cover for Center Ridge in 1997 was 77.6% and included the following life-forms: perennial fortis- 48.3%, perennial grasses - 27.3%, shrubs - 0.1%, annuals and biennials - 1.4%, and noxious weeds - 0.6%. In 1998, Center Ridge total absolute vegetation cover was 52.6% and included the following life-