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Huddleston-Berrv <br />F.r.-fin-trlu_ A TriIIn . LLC <br />United Companies <br />2273 River Road <br />Grand Junction, Colorado 81502 <br />Attention: Mr. Kyle Alpha <br />Subject: Geotechnical Evaluation <br />Proposed Scott Pit <br />Rifle, Colorado <br />Dear Mr. Alpha, <br />(90 White; Avenue, Unit B <br />Grand Junction. CO tt 150 1 <br />1'ilane: 970-255-8005 <br />Fax: 970-2ii-0818 <br />Htuullc,t.•+nfiei t)Gi•Urz?n;lil.n?t <br />April 30, 2008 <br />Project-4100256-0001 <br />At your request, Huddleston-Berry Engineering & 'resting, 1. LC (HBET)conducted a <br />creole chnical evaluation for the proposed. Scott Pit in Rifle, Colorado. H13ET understands that <br />there are concems relating; to the stabilityof'the pit sick slopes along the buffer zone between the <br />proposed mined areas and the Colorado River. 01' significant concern is the impact of flood <br />events on the stability of the pit slopes. <br />Subsurface investigation <br />Tn order to observe the nature: of the overburden soils and gravel rc?tourccs at the site, MO test <br />pits were conducted in February 2008. ne locations of the test pits are shown on Figure 1- Site <br />i'lan. 't'yped test pit logs are included in Appendix A. <br />As indicated on the logs, the subsurface conditions at the site were fairly consistent. The test }sits <br />encountered 2.0 to 2.5 feet of brown, moist, loose to medium dense silty ,,,and above brown, <br />moist, medium dense to dense sandy gavel and cobbles to the bottoms of the excavations. <br />Groundwater was not encountered in the test pits at the time of the investigation, <br />Lab araittin, Testin <br />HEFT was provided a espy of a grain size analysis conducted on the.: gravel and cobble: soils by <br />United Companies. The grain sire analysis indicated that nearly 801,1o of the material was in the <br />D?rac?el size range and that less tltun 1% of the material passed the #200 sieve. Laboratory testing <br />results are included in Appendix B.