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R V D I S Design 8 Consultancy <br /> �A r04A : <br /> for natural and <br /> '1 built assets <br /> Mr. Timothy A. Cazier, P.E. Arcadis U.S.,Inc. <br /> Environmental Protection Specialist 630 Plaza Drive <br /> Colorado Division of Reclamation, Mining and Safety suite 100 <br /> Department of Natural Resources Highlands Ranch <br /> 1313 Sherman Street, Room 215 Colorado 80129 <br /> Denver, Colorado 80203 RECEIVED Tel 720 344 3500 <br /> Fax 720 344 3535 <br /> MAY0 3 2019 www.arcadis.com <br /> Subject: DIVISION OF RECLAMATION ENVIRONMENT <br /> Holcim (US) Inc. Portland, Colorado MINING AND SAFETY <br /> 2019 Groundwater Monitoring Report <br /> DRMS Permit No. M-1977-344, Technical Revision No. 6 Date: <br /> April 30, 2019 <br /> Dear Mr. Cazier: Contact: <br /> Chris Peters <br /> On behalf of Holcim (US) Inc. (Holcim), please find enclosed one copy of the <br /> Final 2019 Groundwater Monitoring Report, which summarizes analytical results Phone: <br /> for groundwater samples collected on March 20, 2019. 517.324.5052 <br /> The 2019 sampling results indicate that except for total iron in monitoring well Email: <br /> MW-7, concentrations of all analytes measured in the two downgradient wells, Chris.Peters@arcadis.com <br /> MW-7 and MW-13, were below respective numeric protection levels. <br /> Our ref: <br /> Based on the March 2019 sampling results that indicate there is no discernible B0025510.2019 <br /> impact from CKD, annual groundwater monitoring will resume unless future <br /> results require increased monitoring frequency. <br /> Please contact me if you have any questions. <br /> Sincerely, <br /> Arcadis U.S., Inc. <br /> Christopher S. Peters, CPG <br /> Vice President <br /> Page: <br /> 1/2 <br />