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<br />STATE OF C7LOFADQ <br />DIVISION OF MINERALS AND GEOLOGY <br />Department of Natural Resources <br />1313 Sherman St., Room 215 <br />Denver, Colorado 80203 <br />Phone: (303) 866-3567 DIVISION OF <br /> <br />FAX: (303) 832-8106 MINERALS <br /> <br /> GEOLOGY <br />DATE: March 12, 2003 R E C L A M A T I O N <br />MINING-SAFETY <br />TO: Peter Wayland, Weiland Sugnet, Inc. Governor <br /> <br />FROM: Allen Sorenson Greg L Walcher <br />Bacuilve Director <br /> Ronald W. Ganany <br />Division Director <br />Suggested Conservative Soil Shear Strength Parameters for Stability Analyses <br />Given that these strength values, in particular the residual strength value for the weathered bedrock, <br />represent the worst-case for potential slope instability, any safety factor in excess of one should be <br />protective of critical structures. <br />CLAY, sandy, soft to stiff, very moist to wet, brown (CL): <br />0' = 28 degrees c' = 50 psf moist unit weight =114 pcf saturated unit weight =126 pcf <br />SAND, fine grained, clayey, silty, very loose, very moist to wet, brown (SC, SM): <br />0' = 25 degrees c' =10 psf • moist unit weight= 90 pcf saturated unit weight =115 pcf <br />SAND, fine grained, clean to slightly silty, dense, wet, brown (SP, SP-SM): <br />0' = 31 degrees c' = 0 psf moist unit weight =117 pef saturated unit weight =130 pef <br />SAND & GRAVEL, fine to coarse grained., some cobbles, clean.40 slightly silty, very dense, wet <br />brown (SP. GP): <br />0' = 35 degrees c' = 0 psf moist unit weight =130 pcf saturated unit weight =137 pcf <br />WEATHERED SHALE this is an over-consolidated stiff-fissured clay, so the residual strength <br />values are appropriate to the analysis: <br />0' =14 degrees c' = 0 psf moist unit weight = 125 pcf saturated unit weight =142 pcf <br /> <br />c'emlhTy DocrooeatAshear surngth panunews doo