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• I II I I III III IIIIIII I STATE OF COLORA00 RiCN nRO D. L?.MM. Gov c,. 999 DEPARTMENT OF NATURAL RESOURCES D. Monte Pascoe, Executive Director MINED LAND RECLAMATION 423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203 Tel. (303) 866-3567 David C. Shelton Director DATE: September 2I, 1982 TO: Sandy Emrich FROM: David Craig ~~ RE: Foidel Creek Mine' Completeness Review I have completed my portions of the completeness review for the proposed Foidel Creek underground mine. Specifically, I reviewed the geology, ground water, and mina opening sealing portions of the application. The following is a Iist of potential completeness issues that I have identified as a result of my review. 1. The applicant has not presented an analysis of the geochemistry of the ~:'- r roof and floor materials in the mine area. Instead, an analysis of ~~,; drill holes in the Eckman Park mine area has been presented. Because 2 ~'~' ~ fit" ~ the mine's development waste will be disposed of in a saturated pit, it is important that any toxic or acid-forming material be accurately delineated prior to disposal. The data presented by the applicant is definitely not adequate. It is neither representative of the mine area or adequately analyzed to accurately determine toxic or acid forming strata. 2, The applicant has not supplied basic baseline hydrologic data regarding ~~ v J(! the Twenty-Mile Sandstone aquifer. Specifically, no water quality, water level, or aquifer hydraulics data has been presented. The aquifer overlies the proposed mine workings. A distance of about 700 feet separate the mine workings from the aquifer. The applicant states that because of this great distance, no impacts will occur. While this assessment is certainly prudent, the potential for impact still exists. The appropriate baseline data will be needed to complete a credible statement of "Probable Hydrologic Consequences".