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• vegetation cover value required for previously disturbed land at the Edna Mine. Although, vegetation measurements taken during the bond release for the remainder of East Ridge estimated the mean vegetation cover value at 22% and the azea appeazed stable in terms of erosion, it was believed that 47% vegetation cover was more appropriate and would be consistent with the minimum vegetation cover value required for previously disturbed lands. fhe vegetation cover value for the East Ridge azea was 64.3%. Undesirable plant species contributed 0.3% to the cover value. Appendix B provides the vegetation sampling data collected during July, 1997. The vegetation sampling was performed in accordance with the Guideline ReeazdinR Selected Coal Mine Bond Release Issues, CDMG (April 18, 1995). Center Ridge -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 pazameters 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 azea. 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%. •