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STATE OF COLORADO DIVISION OF MINERALS AND GEOLOGY Department of Natural Resources 1313 Sherman SL, Room 215 Denver, Colorado 80203 Phone: 1303) II66-3567 FAX: (3031 A32-8106 July 14, 1999 DIVISION O F MINERALS GEOLOGY RECLAMATION MIN ING•SAFETY Kimberley A. Wolf sill ow-e^~ Environmental Engineer Governor Colowyo Coal Company L.P. Greg E. Walther Executive Director 5731 State Highway 13 Mlenael s. Eong Meeker, Colorado 81641 Divisio^ Director Re: Colowyo Coal Company L.P. (Colowyo), CDMG Permit C-81-019; Baseline Monitoring Proposal, South Taylor Area Reference: Colowyo Coal Company L.P. letter of Apri120, 1999, Re: same as above Deaz Ms. Wolf: The proposed baseline monitoring proposal outlined in the referenced letter and at the meeting at Frisco on June 28, 1999 demonstrates considerable thought and should provide substantial information for evaluation of impacts to the quantity and quality of surface and ground water. A number of questions have been developed during our review, and aze presented below. Please provide the Division of Minerals and Geology (Division) with a summary protocol of specific sampling sites, parameters to be monitored, and frequency. The general protocol presented under the referenced letter provides good general guidance, but exceptions might be appropriate in specific circumstances. Our understanding is that Table 1 lists laboratory sampling parameters as compared to the Field Parameter List of Table 2. If so, please re-title Table 1 to indicate that the parameters aze of laboratory analyses. Similazly, Table 3 is thought to mean that monthly samples are field measurements and quarterly and semi-annual parameters are laboratory analyses. If so, please clearly designate them as such in Table 3. The exception, as we discussed by telephone and later confirmed by e-mail (July 12), is the additional parameter of total suspended solids (TSS) taken monthly of perennial streams (a current practice in the Permit). During our review, the Division has arrived at a consensus that monthly sampling for TSS of surface streams is not required. We certainly have no objection to such sampling, but would concur in deleting this parameter from monthly sampling in the proposed baseline sampling program and from the current sampling program of the Permit (would require a technical revision). The TSS parameter would still be applicable to the quarterly filll laboratory suite samples.