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TETRA TECH <br />October 16, 2009 <br />Mr. Timothy T. Carey <br />Department of the Army <br />Corps of Engineers, Omaha District <br />Denver Regulatory Office <br />9307 South Wadsworth Boulevard <br />Littleton, CO 80128-6901 <br />RE: Response to letter regarding Lafarge West, Inc.'s Greeley 35th Avenue Mine <br />Application to the DRMS Permit No. M-1977-036; Corps File No. 199680697 <br />Dear Mr. Carey: <br />We received a copy of your letter dated July 24, 2009 regarding Lafarge West, Inc.'s Greeley <br />35th Avenue Mine application under review by the DRMS. As specified in the letter, Lafarge <br />will notify the Department of the Army regarding permit requirements if any work associated <br />with the 35th Avenue Mine project requires the dredging or filling of an aquatic site in the <br />area. However, due to the unique nature of the property as well as the previous and proposed <br />mining activities taking place, Lafarge would like to clarify that certain aquatic sites on the <br />property would be exempt from this notification. Specifically these areas would include aquatic <br />sites within the perimeter of the mine that have been designed for or created by the operator for <br />temporary use during normal mining operations and areas that have filled with water over time <br />but are slated for mine-related activities in the future. Once mining operations are complete, <br />Lafarge would provide courtesy notification to the Department of the Army and consultation <br />would be conducted on the potential for these sites to be reclaimed as wetland habitats. <br />Sincerely, <br />?amnela TECH <br />ran ch Hora, AICP <br />Senior Planner <br />cc: Jared Ebert, DRMS <br />Anne Johnson, Lafarge West, Inc. <br />Kirby Carroll, Buys and Associates <br />PA23511\133-23511-08005\Deliverables\DRMS\Adequacy Revim\Response 10 16 09\Army Corps Resp.doc <br />1900 S. Sunset Street, Suite I-F Longmont, CO 80501 <br />Tel 303.772.5282 Fax 303.772.7039 www.tetratech.com