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_ III IIIIIIIIIIIIIIII <br /> 999 <br /> August 12, 1997 <br /> Mr. Allen Sorenson n=Cc�Uc� <br /> Division of Minerals and Geology <br /> Department of Natural Resources AUG 1 3 1997 <br /> 1313 Sherman Street, Room 215 <br /> Denver, Colorado 80203 <br /> Division o) minerals&Ueology <br /> Subject: Stability Analysis/Levee at <br /> Deep Farm Pit <br /> Boulder, Colorado <br /> Job No. 25,385 <br /> Mr. Sorenson: <br /> Attached are the results of the stability analysis for the deep farm pit levee <br /> using lower 4)' and C' values than we used in our report No. 25,385 for the levee dated <br /> June 9, 1997 we talked about. The following table compares the criteria: <br /> Lower Values From <br /> June Report Laboratory Test <br /> 4)' C' 0' C' <br /> Levee Fill 45 200 33 160 <br /> Foundation 45 200 33 160 <br /> The figures attached show schematically the levee configuration we used in <br /> our analysis and the theoretical slip surfaces for the several cases. The following <br /> table summarizes and compares the theoretical safety factors from our studies: <br /> Lower Values From <br /> June Report Laboratory Test <br /> Condition Creekside Landside Creekside Landside <br /> Before Flood 4.0 4.0 2.8 3.2 <br /> Sudden Drawdown 3.8 N/A 2.7 N/A <br /> Critical Flood Slope 6.6 4.6 4.5 3.2 <br /> Earthquake 3.5 3.5 2.5 2.8 <br /> CTUTHOMPSON, INC. <br /> CONSULTING ENGINEERS <br /> 1971 WEST 12TH AVENUE - DENVER,COLORADO 80204 0 (303)825-0777 <br />