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c,- ARCADIS <br />Infrastructure, environment, buildings <br /> ARCADIS <br /> 1687 Cole Blvd. <br /> Suite 200 <br /> ?. <br />Lakewood <br /> Colorado 80401 <br />Mr. Berhan Keffelew Tel 303.231.9115 <br />Environmental Protection Specialist ?U? 1 20 Fax 303.231.9571 <br />Colorado Division of Mining Reclamation and Safety 9 <br />©ivis?on www.arcadis-us.com <br />Department of Natural Resources of Minim Reclamation <br />g a <br />1313 Sherman Street, Room 215 nd Safety ' <br />Denver, Colorado 80203 <br /> Environmental <br />Subject: <br />Holcim (US) Inc. Portland, Colorado <br />April 2009 Groundwater Monitoring Report <br />DRMS Permit No. M-1977-344, Technical Revision No. 6 Date: <br />July 14, 2009 <br />Dear Mr. Keffelew: <br />Contact: <br />On behalf of Holcim (US) Inc. (Holcim), please find enclosed one copy of the Final Chris Peters <br />April 2009 Groundwater Monitoring Report, which summarizes analytical results for <br />groundwater samples collected on April 21, 2009. Phone: <br />810.225.1905 <br />On behalf of Holcim, ARCADIS abandoned monitoring wells MW-6, MW-08 and Email: <br />MW-10 on April 7, 2009 per the conclusions of the Final March 2008 Groundwater chris.peters@arcadis- <br />Monitoring Report. ARCADIS also installed a new monitoring well (MW-13) located us.com <br />hydraulically downgradient of the Cement Kiln Dust landfill as part of the November <br />2008 Groundwater Monitoring Plan revision. MW-13 will be monitored on a quarterly Our ref: <br />basis for five consecutive quarters. We request that annual sampling of MW-13 be B0025510 <br />implemented thereafter. Based on the quarterly sampling information obtained during <br />this first year, Holcim will establish compliance standards for MW-13. <br />Please contact me or Joel Bolduc at the quarry (719-288-1427) if you have any <br />questions. <br />Sincerely, <br />ARCADIS <br />G?r <br />Christopher S. Peters, CPG <br />Vice President <br />Copies: <br />Joel Bolduc, Holcim (US) Inc. <br />Lauri Yusko, ARCADIS <br />File <br />Imagine the result