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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 /> September 9, 2019 RECEIVED <br /> Mr. Jared Ebert SEP 12 a';'19 <br /> Division of Reclamation Mining and Safety <br /> 1313 Sherman Street, Room 215 DM810N OF RECLAMATION <br /> Denver, CO 80203 MINING AND SAFETY <br /> Re: Permit Number M-2004-031 — Hazeltine Mine <br /> Technical Revision TR-07 Request to Remove Orr Drain <br /> Dear Jared: <br /> Aggregate Industries submits this request to revise the mine permit requirements as follows: <br /> • Remove requirement to operate the Orr Drain. <br /> • Remove requirement to install reservoir outlet pipes. <br /> • Remove requirement to conduct groundwater monitoring. <br /> On August 15, 2019 the City of Thornton acquired the former Orr parcel thus resolving the <br /> longstanding groundwater mounding issue on the Orr property. Since the Orr Drain is no <br /> longer required to be operated, outlet pipes are no longer required for this purpose. Finally, <br /> with mining concluded in December 2015 and the sole remaining groundwater mounding <br /> issue now resolved, groundwater monitoring is no longer needed. <br /> If you have any questions or require additional information regarding this technical revision, <br /> please do not hesitate to call me at (719) 239-0974. <br /> Very truly yours, <br /> oel Bolduc <br /> Regional Land and Environment Manager <br /> Enclosures: <br /> • Technical Revision form <br /> • Technical Revision fee payment $216 <br /> cc: Scott Twombly, Emily Hunt, Josh Redman, City of Thornton (via e-mail) <br /> Delivering Value A member of the Holcim Group <br />