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O TETRA TECH <br />April 9, 2007 <br />Mr. Jim Dupler <br />Colorado Division of Reclamation, Mining and Safety <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />Re: Morrison Quarry, Jefferson County, Colorado; Authorization to Represent <br />Aggregate Industries -WCR, Inc., MLRB Permit M 1973-021; <br />Tetra Tech RMC Job No.19-3919.038.06 <br />Dear Mr. Dupler: <br />This letter is to confirm that Tetra Tech RMC, Inc. represents Aggregate Industries - <br />WCR, Inc. regarding the Annual Report and Geotechnical Addendum for MLRB Permit <br />M 1973-02I, <br />Please call if you have any questions. <br />Sincerely, <br />TETRA TECH RMC, INC. <br />.r---~-- <br />_~, <br />Ga L nden, R.G. <br />Project Manager <br />Ap roved by <br />ike Refer, Vic ident Aggregate Industries -WCR, Inc. <br />cc: Miko Refer, Vice President, Aggregate Industries -WCR, Inc. <br />Carl Mount, Colorado Division of Reclamation, Mining, and Safety <br />1900 S, Sunset StreeLSuite 1 •F Longmont CO 80501 <br />Te1:303.772:5282 Fax:303.774.7039 <br />www.tetrotecM.com <br />