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~~~ <br />~~~~' LAFARG E <br />NORTH AMERICA <br />AGGREGATES, CONCRETE <br />& ASPHALT <br />Viviay 12, 2006 <br />Tom Schreiner <br />Environmental Protection Specialist <br />~~~ ; Division of Minerals and Geology <br />1313 Sherman Street, Room 215 <br />~-~s p ~ ; ~ !z zG a ~ <br />Denver, CO 80203 <br />SUBJECT: Res onste t!D1VIG Inspection at Lafarge's Mamm Creek (Permit #M-2~) <br />INI~i' o cfitu.e-fytreS <br />Dear Tom Schreiner: <br />Lafarge submits this letter in response to a DMG Inspection conducted on March 28, 2006 at <br />Lafarge's Mamm Creek site (Permit #M-2000-113). The inspection identified three problems that <br />needed responses by May 12, 2006.. Below is our response to each of the three problems. <br />1) A floodplain study dated August 3, 2001 and amended November 13, 2002, satisfies the <br />DMG's request for Lafarge to supply a stabilization plan, which predicts the hydraulic <br />conditions of the Colorado River in and adjacent to the affected area during a 100-year flood <br />event. This study was part of Technical Revision 1, which was approved on Apri122, 2002. <br />The floodplain study also was submitted to the City of Rifle as part of a Watershed Permit <br />Application. Additionally, Lafarge has an agreement with the City of Rifle dated June 20, <br />2001, which seeks to minimize the impact to their water intake structures. <br />2) Enclosed are two copies of a picture of the outlet structure in the Phase 2 Mining Cell. <br />Lafarge installed this structure prior to commencing mining in this phase. The other outlet <br />structure is in Phase 1 and was inspected by the DMG on March 28, 2006. There are <br />currently only two phases that have been opened for mining. <br />3) Enclosed are two copies of design drawings that will be utilized for inlet and outlet <br />structures in each phase of mining. The design is basically the same for both inlet and outlet <br />with only the crest elevation being different. Also enclosed are two copies of the Approved <br />404 Permit from the US Army Corps of Engineers. <br />Please contact me at 303-657-4336 if you have any questions regarding this subject. <br />Si cerel , <br />Mark A. Vigil <br />Land and Lease Specialist <br />WESTERN U.S. REGION <br />10170 Church Ranch Way, Suite 200, Westminster, CO 80021 <br />Office: (303) 657-4000 <br />Web: www.lafargenorthamerica.com <br />