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Fm- E , -P <br />d, <br />HART ENVIRONMENTAL <br />P.O. Box 1303 Boulder, Colorado 80306 Phone: 303.444.6602 <br />April 20, 2011 <br />Mr. Tony Waldron <br />Colorado Division of Reclamation, Mining and Safety RECEIVED <br />1313 Sherman Street, Room 215 APR 2 12 0 11 <br />Denver, Colorado, 80203 <br />Divisior+ Q' " - f?Y ?' <br />Re: Apri130, 2010 DRMS Compliance Letter Mining and Dear Tony: <br /> <br />This letter is written on behalf of my client Ready Mixed Concrete Company <br />(RMCC) in response to the Division of Reclamation, Mining and Safety's (Division) <br />letter dated April 30, 2010 regarding compliance with state water law related to alluvial <br />ground water depletions due to sand and gravel mining. Specifically, the Division <br />proposed that, by April 30, 2011, sand and gravel operators contact the Division to <br />explain their plans for complying with the Division's bonding requirements related to <br />alluvial ground water depletions due to mining. <br />Currently, RMCC has five (5)'approved DRMS construction aggregates permits all <br />of which are in compliance with the Divisions bonding requirements related to alluvial <br />ground water depletions from sand and gravel mining. The status of each of the five <br />permits is described below. <br />Lxromley Lakes (DRMS Permit N M-1987-049) <br />The current Bromley Lakes financia w o als $4,168,740.00 and includes <br />the cost of slurry walls and backfilling (see the Division's Reclamation Cost <br />Summary enclosed) in order to prevent any alluvial ground water depletions <br />associated with the site post reclamation. <br />During mining, ground water depletions are augmented through a site specific <br />Substitute Water Supply Plan approved by the State Engineers Office. <br />2. Ergers Pond (DRMS Permit No. M-1998-036) <br />Prior to the start of mining at Ergers Pond RMCC installed a slurry wall around <br />the perimeter of the area to be mined. In 2006 RMCC began monitoring the <br />slurry wall per the State Engineers Office (SEO) requirements for sealed gravel <br />pits. The monitoring program demonstrated that Ergers Pond met the SEO's <br />criteria for a sealed pit (see enclosed SEO letter dated March 27, 2007). Dry <br />mining began at Ergers Pond in 2008 and will be completed by 2012. <br />Wetlands Banking <br />Environmental Management <br />Land Use Planning <br />Reclamation Design <br />Permitting & Zoning <br />