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(E*W, TETRA TECH <br />April 27, 2011 <br />Mr. Timothy T. Carey <br />Chief, Denver Regulatory Office <br />Department of the Army <br />Corps of Engineers, Omaha District <br />Denver Regulatory Office <br />9307 South Wadsworth Blvd. <br />Littleton, CO 80128-6901 <br />RE: Response to Comments Regarding Lafarge West, Inc., Iverson Mine, DRMS File No. 2011-001 <br />Dear Mr. Carey: <br />We received a copy of your letter dated January 28, 2011 regarding Lafarge West, Inc.'s Iverson Mine <br />project. Prior to operations on the site, Lafarge will contact your office and provide all necessary <br />information for any work on the site that involves the discharge of a dredged material, and any excavation <br />associated with a dredged or fill project, either temporary or permanent, in an aquatic site, which may <br />include ephemeral and perennial streams, wetlands, lakes, ponds, drainage ditches and irrigation ditches. <br />Please contact me at 720-864-4507 or Pam. hora(cD-tetratech.com if you have any questions. <br />Sincerely, <br />TETRA TECH <br />ie q <?. <br />Pamela Franch Hora, AICP <br />Senior Planner <br />cc: Anne Johnson, Lafarge West, Inc. <br />Corey Hansen, Lafarge West, Inc. <br />Peter Hays, DRMS <br />RQ3511\133-23511-10002\Deliverables\DRMS\Adequacy Review\Army Corps Response.doc <br />1900 S. Sunset Street, Suite 1-F Longmont, CO 80501 <br />Tel 303.772.5282 Fax 303.772.7039 wvvw.tetratech.com