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Mountain Region AGGREGATE 1687 Cole Boulevard Phone:303-985-1070 <br /> INDUSTRIES Suite 300 Fax:303-716-5299 <br /> Golden, CO 80401 www.aggregate-us.com <br /> I FD <br /> June 30, 2018 dUt 06?018 <br /> DIVISION <br /> M�N�NG�N�SgF AEON <br /> �Y <br /> Mr. Jared Ebert <br /> Division of Reclamation Mining and Safety <br /> 1313 Sherman Street, Room 215 <br /> Denver, CO 80203 <br /> Re: Permit Number M-2004-031 —Hazeltine Mine <br /> Response to 5/14/2018 Order, Violation MW-2015-003 and MW-2018-008 <br /> Dear Jared: <br /> Aggregate Industries (AI) submits this letter to address corrective actions in the Division's <br /> May 14, 2018 Order, violation MV 2015-003 and MW 2018-008. <br /> Penalty payment of$35,000 was made May 31, 2018. Receipt attached. <br /> Corrective Action A. Locate and rehabilitate monitoring wells. <br /> Agglnd Response: Monitoring wells MW-2, MW-11A, MW-11B, and staff gauges SG-2, SG- <br /> 11 are all functional and accessible as evidenced by monthly data being available for every <br /> month in 2018 year-to-date. <br /> Corrective Action B. Groundwater monitoring data to be submitted quarterly and annual data <br /> submitted with annual report due September 27. <br /> Agglnd Response: Attached are the results for 2nd quarter 2018. Future quarterly reports will <br /> be submitted within 30 days of the end of the monitoring permit, e.g 4th quarter report will be <br /> submitted by January 30. Annual groundwater data will be submitted along with the annual <br /> mining report due September 27 each year. <br /> Corrective Action C. Submit a Technical Revision to modify the permanent monitoring plan to <br /> ensure the mitigation measures for the Orr Property will function year round with little <br /> maintenance. <br /> Agglnd Response: A Technical Revision to ensure mitigation measures function year round <br /> has been prepared and will be submitted with the DRMS TR form, letter of explanation and <br /> fee payment when Aggregate receives the check request for the fee. These items will be <br /> submitted on or before the July 13, 2018 deadline required by the Order. <br /> Delivering Value A member of the Holcim Group <br />