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Boral • ' <br /> Aggregates <br /> BORAL AGGREGATES,INC. <br /> 14585 Brighton Road <br /> Brighton,CO 80601 <br /> Main:303-659-0630 <br /> Fax:303-659-7353 <br /> November 15, 2016 <br /> Mr. Eric Scott <br /> Division of Reclamation, Mining, and Safety <br /> Colorado Department of Natural Resources <br /> 1313 Sherman Street, Room 215 <br /> Denver, Colorado 80203 <br /> Re: Technical Revision Request (DRMS Permit# M-1987-049) Bromley Lakes <br /> Dear Eric: <br /> RMCC wishes to install an underdrain (French Drain) system in a portion of Lot 2 of the <br /> Bromley Lakes Mine Property. This system is proposed to mitigate standing water that is <br /> present along the northwest boundary of the Spier's property. In places the water is <br /> discharging to the surface at an estimated rate of 5 GPM. The area around the Spier <br /> Property was mined and backfilled with a fine grained overburden material and is <br /> believed to be causing the problem. <br /> To resolve this issue, RMCC retained Bishop & Brogden Associates, Inc. to evaluate and <br /> design a permanent solution to lower ground water levels and prevent standing water <br /> from occurring in the future. This Technical Revision request proposes to install a <br /> French Drain System around the Spier's Property that will drain into the McCann Ditch. <br /> Attached to this request is Bishop & Brogden's engineering analysis and proposed <br /> design. The French Drain we are proposing will consist of a collector trench that will <br /> intercept native alluvial gravels along the Spier's Property boundary and a transmission <br /> trench to facilitate drainage to the McCann Ditch. The details of the design are attached <br /> for your review. <br /> RMCC is prepared to begin installation of this system immediately upon approval of this <br /> TR request. We estimate 1 month to mobilize a contractor and complete the work. <br /> As required, RMCC will continue to check water levels in the adjacent monitor wells to <br /> determine the effectiveness of this system. <br /> Other Boral Companies Include Boral Best Block LLC/Boral Construction Materials LLC/Ready Mixed Concrete Company <br />