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<br /> <br />Arcadis U.S., Inc. <br />630 Plaza Drive <br />Suite 200 <br />Highlands Ranch <br />Colorado 80129 <br />Phone: 720 344 3500 <br />Fax: 720 344 3535 <br />www.arcadis.com <br /> <br /> <br /> <br />1/1 <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 /> <br />Date: May 6, 2021 <br />Our Ref: 30080095 <br />Subject: Holcim (US) Inc. Portland, Colorado <br />2021 Groundwater Monitoring Report <br />DRMS Permit No. M-1977-344, Technical Revision No. 6 <br /> <br />Dear Mr. Cazier, <br /> <br />On behalf of Holcim (US) Inc. (Holcim), please find enclosed one copy of the Final 2021 Groundwater Monitoring <br />Report, which summarizes analytical results for groundwater samples collected on March 18, 2021. <br />The 2021 sampling results indicate that except for total iron in monitoring well MW-7, concentrations of all <br />analytes measured in the two downgradient wells, MW-7 and MW-13, were below respective numeric protection <br />levels. <br />Based on the March 2021 sampling results that indicate there is no discernible impact from CKD, annual <br />groundwater monitoring will resume unless future results require increased monitoring frequency. <br />Please contact me if you have any questions. <br /> <br />Sincerely, <br />Arcadis U.S., Inc. <br /> <br /> <br />Christopher S. Peters, CPG <br />Vice President <br /> <br />Email: chris.peters@arcadis.com <br />Direct Line: 517 324 5052 <br /> <br />CC. Darlene Bray, Holcim (US) Inc. <br /> Treck Hohman, Arcadis <br /> File <br /> <br />Enclosure: <br /> Final 2021 Groundwater Monitoring Report