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10-27-1997 11 :5dAM FROF1 ENG. WEST ELK t`1INE 97fd 9295050 • Mountain Coal Company West Elk Mine Past Office Box 597 Somerset, Colorado 97434 Telephone 914929-5 01 5 October 24, 1997 Mr. Michael Boulay Colorado Division of Minerals and Geology 1313 Shertnan Street, Room 215 Denver, CO 80203 RE: Technical Revision No. 81 (Lone Pine Pond); West Elk Mine; Permit No. C-80.007 Dear Mike: P. 2 III IIIIIIIIIIIII III 999 Mountain Coal Company (MCC) has reviewed the Division's adequacy questions ~ regarding the above referenced technical revision application and provides the following additional information. l . The mine water to be discharged into Lone Pine Gulch, either from the pond or directly from the pipeline, is discussed in the revised PHC (TR#80) currently tinder review by the Division. 2. Upon completion of the pond construction, MCC will typically direct all of the mine water to the pond. Any discharge, whether from the pond or directly from the pipeline, will be sampled and analyzed to determine compliance with NPDES discharge parameters. 3, MCC is unsure as to the observed instability of Highway 133 downslope from the pond location to which the Division is referring. The North Fork of the Gunnison River is located between the Lone Pine pond and State Highway 133, as shown on Map 53A, Regardless, the liner will be installed prior to use. 4. The revised total topsoil calculation on Table 36 was incorrect. The total has been revised as discussed in the response to question #5. 5. MCC has recalculated the azea of disturbance associated with the construction of the pond to be 2.2 acres. Therefore, it is expected that approximately 3,500 CY of topsoil will be stripped and stockpiled. For expediency, MCC will not object to the Division's use of the higher volume that was calculated by the Division for the bond estimate. MCC will provide as-built voltunes following the construction of the pond.