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GENERAL43772
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Entry Properties
Last modified
8/24/2016 8:12:34 PM
Creation date
11/23/2007 12:38:01 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981038
IBM Index Class Name
General Documents
Doc Date
10/14/1986
Doc Name
FOUNDATION DESIGN CRITERIA FOR PROPOSED 200000 GALLON WATER STORAGE TANK ADDITIONAL ANALYSES FOR
From
GOLDER ASSOCIATES
To
COLO WESTMORELAND INC
Permit Index Doc Type
GENERAL CORRESPONDENCE
Media Type
D
Archive
No
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J <br /> <br />~~ Golder Associates <br />a CONSULTING GEOTECHNICAL AND MINING ENGINEERS <br />October 13, 1986 <br />Colorado Westmoreland Inc. <br />P.O. Box E <br />Paonia, Colorado 81928 <br />Attention: Ms. Kathleen A. Welt <br />Environmental Specialist <br />__ Q_t . <br />III IIIIIIIIIIIIIIII <br />sss <br /> <br />Our Ref: 863-2032 <br />RE: FOUNDATION DESIGN CRITERIA FOR PROPOSED 200,000 GALLON <br />WATER-STORAGE TANK - ADDITIONAL ANALYSES FOR <br />FOUNDATION SLOPE STABILITY <br />Dear Kathy: <br />This letter summarizes additional stability analyses, re- <br />quested by the CMLRD, that evaluate the change in slope <br />stability caused by installation of the 200,000-gallon water <br />tank near drill hole 81. <br />The bedrock surface contour was estimated from nearby drill <br />holes. The location and configuration of the tank and asso- <br />ciated cuts and fills were determined from the attached <br />telecopy prints received on October 8, 1986 from CWI. The <br />stability analyses were performed with the Golder program <br />CSLOPE using a modified Bishop's analysis for circular <br />failure and a Sarma analysis for colluvium/bedrock contact <br />failure. The ground-water elevation was conservatively <br />chosen to correspond with the ground surface. <br />Results of the stability analyses are on the attached Figure <br />1. Failure planes with minimum safety factors are shown for <br />both a circular failure and colluvium/bedrock failure paths. <br />Factors of safety corresponding to these two failure planes <br />are greater than 1.50 and are considered acceptable. <br />These results are based on the assumptions set forth above <br />and on the assumption that soil strength properties in the <br />slope coincide with those derived from the soil testing <br />program. Although the analysis was performed assuming satu- <br />ration, it is recommended that measures be taken to prevent <br />leakage of the tank and recharge of the colluvium tank foun- <br />dation. As recommended earlier, the tank should be placed <br />COLDER ASSOLIAiES. INL ~ ~%J01 Y/ WLFAN AYENUF. SUITE 2P. GOLDE410ENVE RI COLORADO BOaO~ U 5 A • TELEPHONE IJWI 219~B66P <br />OFFICES IN CANADA ~ UNNED STATES • UNITED KINGDOM • AUSTRALIA <br />
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