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' <br />~~ <br />~Nt~N ~WILSC:~N <br />~" V FAIRBANKS <br />L <br />S <br />S <br />~ <br />T ANCFIORAGE <br />DENVER <br /> SAINT LOUIS <br /> SACRAMENTO <br /> JACKSONVILLE <br />November 21, 2008 <br />Rio Tinto Energy America <br />Colowyo Mine <br />5731 State Highway 13 <br />Meeker, Colorado 81641 <br />Attn: Mr. Tay Tonozzi <br />RE: ADDENDUM N0.2 TO GEOTECHNICAL STUDY 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" (July, 2006). This letter addresses the following issues regarding spoil drain design <br />and construction: <br />1. Valley Drains -revised beginning and end locations. <br />2. Spoil Stability -opinion regarding spoil stability considering proposed highwall <br />i <br />mining. <br />We have revised Figure 5 from our previous report to reflect changes in the mining plan. <br />VALLEY DRAINS <br />In this letter, the valley drains are referred to as the west, middle and east drains (Figure 5). <br />West Drain. No changes are proposed for the west drain. <br />1060 BANNOCK STREET, SUITE 200 <br />QENVER, COLORADO 80204 <br />PHONE 303.825.3800 <br />FAX 303.825.3801 <br />www. s h a n no nwi Ison. com <br />23-1-01105-200 <br />Exh. 21, Item 1 Revision Date: 11/22/08 <br />Second Intro. Letter - 1 Revision No.: TR-77 <br />