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• III IIIIIIIIIIIIIIII • 999 STATE OF COLORADO DIVISION OF MINERALS AND GEOLOGY Depanmenl o(Nawral Resources 131 3 Sherman St.. Room ? 15 Dcnvcr, CO 80203 Phonc~ (303) ft66~3567 FAY. (303) 832-8106 July 14, 1993 Mr. Jon C. Kubic Water Quality Control Division Permits and Enforcement Section 4300 Cherry Creek Dr. 5. Denver, Co. 80222-1530 RE: Permit Inactivation Request, Rockcastle Company, Grassy Gap Mine, #C-81-039, NPDES permit # COG-850023 Dear Mr. Kubic: of cow tip= ~e \ ~ r8 T6 ~ Ray Romer Governor Michael B. Long Division Director Recently, a request was made by Rockcastle Coal Company to inactivate the CDPS permit for the Grassy Creek (Gap) Mine. Based on your response dated May 13, 1993, this request was denied until such time as the Colorado Division of Minerals & Geology (CDMG) is fully satisfied that the site has been adequately reclaimed. It is the opinion of CDMG that this site, in its present state, has been returned to an adequately stable condition. All point source discharge locations, with the exceptions of 001 and 005, have been eliminated by reclamation of sediment ponds, and demonstration as required by the Rules and Regulations of the Colorado Mined Land Reclamation Board for Coal Mining. Specifically, Rule 4.05. 2 (2) requires that sediment ponds be retained until the affected area ceases to contribute additional suspended solids above the premining condition, and the effluent meets State and Federal water quality standards. The operator adequately demonstrated compliance with this Rule for all point source locations except 001 and 005, and with the exceptions of points 001 and 005, the points have been removed. Location 001 is Pond 4 (Pit 4), which discharges to Grassy Creek. This pond has been approved as a permanent impoundment per Rule 4.05.9(1), and it is intended for use as a livestock water source. Rule 4.05.9(1)(a> requires the effluent from such impoundments must meet applicable State and Federal water quality standards. A check of the discharge record for Pond 4 indicates no discharge during its history. Based on the revegetation over 957, of the watershed and the observations of little or no water in the pond during the heavy runoff season of 1993, its our opinion this impoundment will not discharge to Grassy Creek. In the event that it did, it is designed to control settleable solids within appropriate limits.