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Oct 30 2007 7:49RM Cemex Inc. 303 823 2199 p.2 <br />~~cmcx <br />October 29, 2007 <br />Ms. Erica Crosby <br />Environmental Protection Specialist <br />Division of Reclamation, Mining and Safety <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />Re: CEMEX Lpons Mine Permit M-19?7-208 <br />Response to 10-5-D7 Adequary Review Letter <br />Technical Revision No. 9, C-Pit Hydrogeologic Imestigadons <br />Dear M5. CYO5hy: <br />This letter addresses the four i_<sues raised in die Division's Adequacy Review letter to <br />CEMEX of October 5, 2007. The DRb1S' comments/questions ate repeated below, <br />foAowed by CEMEX's response. <br />1. Please find artached comments regarding the hydrogeologic investigation and changes to <br />the groundwater monitoring program at the site. The folian+ing ditcxrrimn it in rerponre to Damid <br />Bird'r October 12, 2007 memorandum to Erica Cmrby.: <br />a. Reducdoa of sampling frequency fot GPit Water from quarterly to semi- <br />annually. <br />Due to the history of constituents in pit water at concentrations exceeding <br />regulatory limits, DRMS should requite at least five quarters of analyses with <br />results below mgulatory limits before approving this proposal. <br />CEMEX Response: CF.t19EX will ronMnue to rampk C-Pit mater fnr fame ronrecutfve guarterr..4t the <br />co~xpktzbn of Ibis period, GE7y1EX will mnniler ptopsring ¢ dr.(ferent rattp:ing rcheduk tm DI{M.f, <br />depending upon the rentltr far C-Pit, ar smell ar the data from zhe monitoring well ntttmor.~ The finT <br />quarterly rampk will be taken in Ocdober 1007. <br />b. Eliminate dissolved thallium and chloride from the analyte list. <br />Because of the history of thallium and chloride detections at the site, eliminating <br />thallium and chloride from the analyte state would be pretnatuxe. Thallium and <br />chloride aze regulated parameters, and should therefore be analyzed for five <br />quarters, with results below regulatory limits, before DRMS approves their <br />removal from the analyte suite. <br />Lyoni Plant <br />P.D. Box 529, Lyons, CO 80540. U5A (303)823-2100, Fax (303)832-2199 <br />