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<br /> <br />Imagine the result <br />Mr. Timothy A. Cazier, P.E. <br />Environmental Protection Specialist <br />Colorado Division of Reclamation, Mining and Safety <br />Department of Natural Resources <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />Subject: <br />Response to DRMS Technical Revision (TR-10) Preliminary Adequacy Review <br />Holcim (US) Inc. Portland, Colorado Limestone Quarry, Permit No. M-1977-344 <br /> <br /> <br />Dear Mr. Cazier: <br />ARCADIS has prepared this letter on behalf of Holcim (US) Inc. (Holcim) to respond <br />to the Division of Reclamation, Mining and Safety (DRMS) Technical Revision (TR- <br />10) Technical Adequacy Review of the “Proposal to Remove Sodium as a <br />Groundwater Quality Parameter – DRMS Permit No. M-1977-344, Technical <br />Revision No. 6”, dated August 4, 2014 and received by DRMS on October 20, 2014. <br />The DRMS responded to the above proposal in a letter to Justin Andrews of Holcim <br />dated October 31, 2014, requesting additional information be provided before they <br />would authorize the removal of sodium as a water quality parameter to evaluate <br />potential impact from leaching of cement kiln dust (CKD). <br />Presented below is a summary of the DRMS comment from the October 31 letter <br />followed by ARCADIS’ response. We believe this information will provide the <br />justification to remove the numeric protection level (NPL) for sodium from the <br />groundwater monitoring program, approved by the DRMS on February 24, 2009 and <br />updated on November 27, 2012. W e would propose as a revision to the groundwater <br />monitoring program to continue to analyze groundwater samples for sodium in order <br />to continue to determine the potassium to sodium ratio, which we would propose to <br />replace the sodium NPL as the primary water quality indicator of impact from the <br />CKD landfill. <br />1) Relationship between depth to water and sodium concentration in <br />monitoring well MW-7: <br />The DRMS acknowledges that the higher concentrations of sodium observed in MW - <br />7 may be partially attributable to lower water levels in that monitoring well, but <br />commented that ARCADIS should provide further discussion as to why the <br />increased sodium concentrations are not attributable to impacts from CKD. <br />ARCADIS <br />1687 Cole Blvd. <br />Suite 200 <br />Lakewood <br />Colorado 80401 <br />Tel 303.231.9115 <br />Fax 303.231.9571 <br />www.arcadis-us.com <br />Environment <br />Date: <br />November 19, 2014 <br />Contact: <br />Chris Peters <br />Phone: <br />517.324.5052 <br />Email: <br />chris.peters@ <br />arcadis-us.com <br /> <br />Our ref: <br />B0025510