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<br />~~ SHANNON ~Wtl_SON, INC. <br />GFi,'r E..BN WhL hNJ c`+y.,Fpk}dcry u;. GOhaI L:;..l'3 <br />October 26, 2006 <br />L.J <br />Rio Tinto Energy America <br />Colowyo Mine <br />5731 State Highway 13 <br />Meeker, Colorado 81641 <br />Attn: Mr. Tay Tonazzi <br />RE: ADDENDUM NO. ] TO GEOTECHNICAL STDDY FOR EXCESS SPOIL, <br />SOUTH TAYLOR MINE AREA, COLOWYO MINE, <br />MOFFAT AND RIO BLANCO COUNTIES, COLORADO <br />This letter is an addendum to our previous report "Geotechnical Study, South Taylor Excess <br />Spoil Fills" (7uly, 2006). This letter presents the following: <br />1, Observation of excavation in the azea of the excess fill in the East Fork of the <br />East Fork of Taylor Creek, along with sampling and testing of a soil sample <br />obtained from the base of the drainage. <br />2, Revision of drain recommendations for both Main Valley Drains and Lateral <br />Drains in response to comments by the Colorado Division of Reclamation and <br />Mine Safety (DAMS). <br />3. Recommendations regarding sediment pond emballkment stability analysis and <br />wnstivction. <br />Our services were provided in accordance with our proposal (Proposal No. 23-2-1 ] 129-501, <br />dated October 2, 2005) and our Master Service Agreement, M366. <br /> <br />1440 BLAKE STREET, SUITE 150 <br />DENVER, COLORADO 80202 <br />PHONE 303.825.3800 <br />FAX 303.8253801 <br />wwwshannanwilson.eam <br />Exh. 21, Item 1 <br />Intro. Letter-1 <br />23-1-01105-200 <br />Revision Date: 11/14/06 <br />Revision No.: PR-02 <br />