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1697 Cole Boulevard <br />Suite 200 <br />Golden, CO 80401 <br />Tel: (303) 239-5400 <br />Fax: (303) 239-5454 <br /> <br />March 30, 2007 <br />Q `JG <br />Ms. Erica Crosby <br />Environmental Protection Specialist ~yy Q <br />Division of Reclamation, Mining and Bakery ~~ <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />Re: CEMEX Lyons- Kline Permit M-1977-208__ <br />Technical Revision No. 8, C-Pit Hydropeolo c nv ar ga++nns <br />Dear Ms. Crosby: <br />CEMEX requests a Technical Revision to their Mine Pemut M-1977-208 to conduct <br />hydtogeologic investigations at C-Pit and to install a compliance well down gradient and to <br />the east of C-Pit. The following ^axxative describes the objectives of this revision and the <br />proposed plan, and is based upon recent meetings between the Division and CEMEX at <br />your offices and at subsequent site inspections. <br />BACKGROUND <br />At the February 9, 2007 meeting with DRMS, CEMEX confirmed to the agency that: <br />Pumping C-Pit water to the plant fox cooling was not a viable option to expediently <br />eliminate the exposed water surface in C-Pit fox various operational reasons, <br />primarily related to air permitting considerations. <br />CEMEX planned to place a sufficient volume of inert shale and/ox from nearby <br />stockpiles/areas on the Lyons permit or from Dowe Flats to Etll in C-Pit and <br />eliminate any exposed surface water by the May 17, 2007 deadline. This is <br />consistent with the current reclamation plan. DRMS wanted to ensure that any rise <br />in water levels not create additional issues. Should CEMEX be unable to <br />completely eliminate standing water by the May 17 deadline, they propose to <br />provide alternate wildlife mitigation responses such as bird balls or netting. <br />Once the C-Pit exposed water surface was eliminated, CEMEX would continue to <br />use C-Pit as its pemntted disposal site Eor cement kiln dust (CKD). <br />DRMS concurred with the concept of filling the eastern portion of the pit with inert shale <br />fill. In the discussion that followed, DRMS requested assurance that there would not be <br />potential impacts to usable groundwater from C-Pit, and indicated that the following issues <br />needed to be addressed: <br />~0594GS6.doc <br />