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Applegater <br />. Group, ine. <br />Water Resource Advisors for the West <br />1 +[' IV <br />April 28, 2011 ?Q ? <br />Mr: Tony Waldron <br />Division of Reclamation, Mining and Safety <br />1313 Sherman St., Room 215 <br />Denver, CO 80203 <br />Response to DRMS Letter Pertaining to Mining `Operahons with Exposed Groundwater-- <br />1411979002 (North Delta _ Pit); M142034 (Miller Pit); M19$52?18 (Rich Pit); <br />M <br />1986079 (M&G Pit); M1991035 (Bluestone Pit);M199: 4045 (Bluestone Pit) <br />-` <br />Dear Tony: <br />On behalf of Lafarge West, Inc: ,(Lafarge), I am writing to respond to` the Division of Reclamation, <br />Mining, and Safety (DBMS) letter sent to Lafarge on April 30, 2010 regarding mining operations <br />with exposed groundwater. The specific mining operations listed above currently expose <br />groundwater. In order to maintain compliance with the. requirements of the Colorado Land <br />Reclamation Act for the Extraction of Construction Materials and the Mineral'Rules and Regulations <br />of the Colorado ,Mined Land Reclamation Board fore the Extraction of Construction' Materials, <br />Lafarge is considering bonding these sites to, install a :clay liner or slurry wall to' prevent future <br />groundwater exposure. Pursuant to DRMS guidance,, Lafarge anticipates that it will have up to three <br />years to phase in the new bonding for these, sites. - <br />A preliminary estimate of the cost to install a liner was performed for each site., The, attached figures <br />display how the perimeter and depth of the liners- were "estimated. The costs of the liners were <br />calculated assuming a liner cost of $3.50 per square foot. The estimated liner costs at each site are <br />summarized below: <br />• . 4orth Delta Pit: $177,450 - - <br />• Miller Pit: $175,665 <br />• Rich Pit: $271,320 <br />• M&G Pit: $655,200 <br />• Bluestone- Pit (M1991035): $1,6801000 - ,. <br />o At this time we are unsure whether the water visible on aerial photos of the area is , <br />exposed groundwater or pooled, surface water. Lafarge : will be conducting <br />investigations in the near term to determine the source of the water. <br />• Bluestone Pit (M1994045): $1,129,800 - <br />0 , Again, at this time we are unsure whether`the water risible on aerial photos of the <br />area is exposed; groundwater' or pooled surface water. Lafarge wiltbe conducting <br />investigations in the near term'todetermine the source of the water, <br />1499 West 120th Avenue, Suite 200 (303) 452-6611 Fax (303) 452-9759 <br />Denver, Colorado 80234 www.applegategroup.com