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ICOLORADO <br /> Division of Reclamation, <br /> Mining and Safety <br /> Department of Natural Resources <br /> 1313 Sherman Street, Room 215 <br /> Denver,CO 80203 <br /> May 24,2016 <br /> Saul Alvidrez <br /> GCC Rio Grande,Inc. <br /> 3372 Lime Rd. <br /> Pueblo,CO 81004 <br /> Re: Pueblo Cement Plant and Limestone Quarry,DRMS File No.M-2002-004 <br /> Response to Groundwater Monitoring Evaluation <br /> Dear Mr.Alvidrez: <br /> On April 26,2016,the Division of Reclamation, Mining and Safety(Division)received your letter commenting on the <br /> groundwater monitoring evaluation and the proposed well. The Division is appreciative of the effort put forth in the <br /> preceding investigation and your letter. The proposed well location appears to be adequate. The Division would prefer <br /> that the well be either be a multilevel system containing a packer or seal to separate the Fort Hayes and the Codell <br /> Sandstone or a set of nested wells screening each interval. The Division would prefer quarterly sampling for the first <br /> year and a half. If no groundwater is encountered then sampling frequency could be reduced to biannual with one <br /> sampling event occurring during the summer and the other sampling event occurring during the winter. <br /> In order to incorporate the new well described in the letter,the Operator will need to submit a Technical Revision(TR). <br /> At a minimum the TR shall demonstrate compliance with Rule 3.1.7 and contain the following: <br /> • Monitoring well design <br /> • Well completion and development <br /> • Topographic map,including the affected land boundary <br /> o Depict the fault and describe the fault displacement <br /> o Identify the dip and strike on both sides of the fault <br /> • Revised groundwater monitoring and sampling plans <br /> o Describe sampling method <br /> o Identify sampling constituents and lab analytical method and analytical detection limits <br /> o Propose reporting frequency and protocol <br /> • Identify proposed numeric protection limits(NPL) <br /> • Check for the$216 TR fee <br /> If you need additional information please contact me at the Division of Reclamation,Mining and Safety, 1313 Sherman <br /> St., Room 215, Denver, CO 80203, by telephone at 303-866-3567, extension 8131, or by email at <br /> Tyler.ODonnell(it',state.co.us. <br /> co.us. <br /> Sincerely, <br /> Tyler O'Donnell <br /> Environmental Protection Specialist <br /> cc: Wally Erickson,DRMS <br /> Edwin Olivares,GCC Rio Grande,Inc. <br /> Coto <br /> 1313 Sherman Street, Room 215,Denver,CO 80203 P 303.866.3567 F 303.832.8106 http://mining.state.co.usm., � ► ' <br /> John W. Hickenlooper,Governor I Robert Randall, Interim-Executive Director I Virginia Brannon,Director t U <br />