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ARCADIS <br />Mr.'Timothy A. Cazier, P.E. <br />Environmental Protection Specialist <br />Colorado Division of Mining Reclamation and Safety <br />Department of Natural Resources <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />Subject <br />� <br />olcim (US) Inc. Portland, Colorado <br />arch 2013 Groundwater Monitoring Report <br />DRMS Permit No. 1+1977 -344, Technical Revision No. 6 <br />Dear Mr. Cazier: <br />On behalf of Holcim (US) Inc. ( Holcim), please find enclosed one copy of the Final <br />March 2013 Groundwater Monitoring Report, which summarizes analytical results for <br />groundwater samples collected on March 18, 2013. <br />The March 2013 sampling results indicate that sodium in groundwater from MW -7 and <br />sulfate in groundwater from MW -13 exceed their respective NPLs. However, semi- <br />annual monitoring is no longer required per the DRMS letter dated February 24, 2009 <br />for MW -7 and the DRMS letter dated November 27, 2012 for MW -13, because there <br />was only one exceedance from each monitoring well. <br />Based on March 2013 sampling results that indicate there is no discernible impact from <br />CKD, annual groundwater monitoring will resume unless future results require <br />increased monitoring frequency. <br />Please contact me or Justin Andrews (719.288.1423) if you have any questions. <br />Sincerely, <br />ARCADIS <br />V <br />Christopher S. Peters, CPG <br />Vice President <br />Copies <br />Justin Andrews, Holcim (US) Inc. <br />Lauri Yusko, ARCADIS <br />File <br />Imagine the result <br />RECEIVED <br />AMY '?f3 2013 <br />DIVISION OF RECLAMATION <br />MININGAND SAFETY <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 />Environmental <br />Date <br />May 24, 2013 <br />Contact <br />Chris Peters <br />Phone <br />810.225.1905 <br />Email <br />chris.peters@arcadis- <br />us.com <br />Our ref <br />B0025510 <br />