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<br /> <br />Arcadis U.S., Inc. <br />630 Plaza Drive <br />Suite 100 <br />Highlands Ranch <br />Colorado 80129 <br />Tel 720 344 3500 <br />Fax 720 344 3535 <br />www.arcadis.com <br />Page: <br />1/2 <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 />Holcim (US) Inc. Portland, Colorado <br />2020 Groundwater Monitoring Report <br />DRMS Permit No. M-1977-344, Technical Revision No. 6 <br /> <br />Dear Mr. Cazier: <br />On behalf of Holcim (US) Inc. (Holcim), please find enclosed one copy of the <br />Final 2020 Groundwater Monitoring Report, which summarizes analytical results <br />for groundwater samples collected on March 11, 2020. <br />The 2020 sampling results indicate that except for total iron in monitoring well <br />MW-7, concentrations of all analytes measured in the two downgradient wells, <br />MW-7 and MW-13, were below respective numeric protection levels. <br />Based on the March 2020 sampling results that indicate there is no discernible <br />impact from CKD, annual groundwater monitoring will resume unless future <br />results require increased monitoring frequency. Additionally, Arcadis <br />recommends that TSS analysis be added to the groundwater sampling program <br />in 2021 to monitor the correlation of concentrations of suspended solids and total <br />iron. <br />Please contact me if you have any questions. <br />Sincerely, <br />Arcadis U.S., Inc. <br /> <br />Christopher S. Peters, CPG <br />Vice President <br />ENVIRONMENT <br /> <br /> <br /> <br />Date: <br />May 29, 2020 <br /> <br />Contact: <br />Chris Peters <br /> <br />Phone: <br />517.324.5052 <br /> <br />Email: <br />Chris.Peters@arcadis.com <br /> <br />Our ref: <br />30043054 <br /> <br /> <br /> <br /> <br />