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COLORADO <br /> Division of Reclamation, <br /> Mining and Safety <br /> Department of Natural Resources <br /> 1313 Sherman Street, Room 215 <br /> Denver, CO 80203 <br /> October 31, 2014 <br /> ' Mr. Justin Andrews <br /> Holcim (US) Inc. <br /> 3500 Highway 120 <br /> Florence, CO 81226 <br /> ' Re: Portland Limestone Quarry, Permit No. M-1977-344; <br /> Technical Revision (TR-10) Preliminary Adequacy Review <br /> Dear Mr. Andrews: <br /> On October 20, 2014 the Division of Reclamation, Mining and Safety (Division) received a request <br /> for a Technical Revision(TR-10)addressing the following: <br /> • Proposal to remove sodium as groundwater quality parameter. <br /> tThe submittal was called complete for the purpose of filing on October 20, 2014. The decision date <br /> for TR-10 is November 19, 2014. Please be advised that if you are unable to satisfactorily address <br /> any concerns identified in this review before the decision date, it will be your responsibility to <br /> request an extension of the review period. If there are outstanding issues that have not been <br /> adequately addressed prior to the end of the review period, and no extension has been requested, the <br /> Division will deny this technical revision. <br /> The Division is not opposed to modifying parameters used to indicate potential impacts to <br /> 1 groundwater from buried and/or landfilled cement kiln dust (CKD) at the Portland Limestone <br /> Quarry. However, the Division has the following concerns and questions related to the proposal <br /> submitted by Arcadis, dated August 4, 2014: <br /> ' 1) Increased depth to water vs. higher sodium concentration: Mr. Peters argues that the <br /> observed trend in the increased depth to groundwater means there is less Arkansas River <br /> water available in monitoring wells MW-7 and MW-13 for dilution. The Division <br /> concurs the lower water level may be a contributing factor, but as stipulated by Mr. <br /> Peters on the top of page 2, the correlation exhibited in MW-13 is not as strong. <br /> Therefore, it is reasonable to assume there are other contributing factors, that Mr. Peters <br /> concedes are"not clear". Further, there is no discussion provided indicating the observed <br /> 01F,co <br /> o <br /> 1313 Sherman Street, Room 215, Denver, CO 80203 P 303.866.3567 F 303.832.8106 http://mining.state.co.us * ',,( * <br /> John W. Hickentooper,Governor I Mike King, Executive Director I Virginia Brannon, Director <br /> Ig�6 <br />