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_ ? G7 J <br />Applegate <br />Inc. <br />Group, <br />Water Resource Advisors for the West <br />`!?"?1 <br />April 28, 2011 <br />MAY 09 mil <br />Mr. Tony Waldron M e <br />Division of Reclamation, Mining- and Safety . <br />1313 Sherman St., Room 215 <br />Denver, CO 80203 <br />Re: Response to DRMS Letter Pertaining to Mi ng Operations with Exposed Groundwater. <br />M19.79002 (North Delta Pit); ?M1982034 (Miller Pit); M1.985218 (Rich Pit) - <br />1,-W 986079 (M&G Pit); M1-991035 (Bluestone Pit); M1994045 (Bluestone Pit) <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 (DR-MS) 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 for 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 aliner cost of $3.50 pet square foot. The estimated liner costs ateach siteare <br />summarized below: <br />•. North Delta Pit: $177,450 <br />Miller Pit: $175,665 <br />• "'Rich Pit: $271,320 <br />M&G Pit: $655,200 <br />• Bluestone Pit (M1991035): $1,680,000 <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 (MI 994045): $1,129,800 <br />o Again, at-this time we are unsure whether the water visible on aerial photos of the <br />wren. Is exposed groundvifer or poo!cd sPrfnce ?i;;rter. [.'?fame will he r,nnr{iirfire <br />investigationsin the near termto-determine the source of the water. <br />1499 West 120th Avenue, Suite 200 (303) 452-6611 • Fax (303) 452-2759 <br />Denver, Colorado 80234 www.applegategroup.com