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• May 8, 1997 `~ 1t~ Gary Curtiss Environmental Protection Specialist Colorado Division of Minerals and Geology 1313 Sherman St., Room 215 Denver, CO 80203 • ,~~~7 Subject: Response to Your Adequacy letter of November 5, 1996, Del Camino Sand and Gravel Mine, File No. M-96-052, Owens Brothers Concrete Co. Dear Gary: iii iiiiiiiiiiiu iii I need to preface our response to your adequacy letter with a project history and the objectives of the permtttee (Owens Brothers Concrete Co.). Owens Brothers Concrete has historically purchased construction aggregates from commercial producers for use in their ready mix concrete business. The company purchased the Del Camino property in 1985 with the intent of eventually permitting it and mining the aggregate for their own internal use. Last year we gained approval from the Weld County Commissioners, filed the CMLRB application and filed the Substitute Water Supply Plan with the Division of Water Resources (copy of application document attached to this letter). The company's intent is to initiate mining in the next year or perhaps two and obviously wants and needs all permits in place. Detailed, final plans for the operation have not been formulated. For this reason we would like to gain permit approval from the Division now and submit the various details that you have requested later, when they are known. Submittal of these details will be a precondition to land disturbance along with the submittal of a financial warranty for reclamation. Item #1: Discharge Permit The applicant has not yet applied for a Colorado Discharge Permit System (CDPS) permit to the Colorado Dept. of Public Health and Environment (CDPHE). According to the Substitute Supply Plan submitted to the State Engineer (on January 21, 1997), water from the dewatering operation will be discharged into St. Vrain Creek. The exact location of the discharge point is not curcently known but will be shown in the CDPS permit application. The applicant will provide the Division with verification that the CDPS permit has been approved prior to any mining disturbance. We request that this be a condition of permit approval.