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A1W <br />LAFARG E <br />AGGREGATES <br />& CONCRETE <br />February 11, 2011 CERTIFIED MAIL 7007 2680 0001 0955 3205 <br />Mr. Steve Caldwell, Vice President of Operations <br />TowerCo <br />5000 Valleystone Drive <br />Suite 200 <br />Cary, North Carolina 27519 <br />Dear Mr. Caldwell, <br />The enclosed is in response to your January 27, 2011 letter regarding an Open Pit Sand and <br />Gravel Mine in unincorporated Weld County, Colorado. Enclosed please find a report prepared <br />by Tetra Tech, Inc. dated February 7, 2011 regarding the Stability Analysis Report which advises <br />the Factor of Safety is 2.8 rather than the previously indicated 1.1. <br />Please review this report and contact me at your earliest convenience with any questions. I may <br />be reached at (303) 684-2307. <br />Sincerely, <br />Anne Best Johnson, AICP <br />Land Manager <br />Electronic copy: Pam Hora, Tetra Tech <br />John Van Voorhis, Lafarge <br />LAFARGE NORTH AMERICA INC <br />11409 Business Park Circle, Ste 200 <br />Longmont, CO 80504 <br />(303) 657-4000 <br />www.lafargenorthamerica.com