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1 <br /> OB-13 Drilled July 24 , 1988 <br /> ----------------------------------------------- <br /> Depth <br /> I Interval USCS <br /> (feet) <br /> Sol <br /> ymb Description <br /> ----- ----- --- --------------------------------------------- <br /> 0 - 3 GM Gravelly silt: poorly graded; medium dense; <br /> very-slightly moist; light yellow-gray. <br /> 1 3 - 25 ML Clayey silt: well graded; loose; moist to <br /> 1 wet; black. <br /> 25 - 43 SM Sandy silt: moderatelygraded; very-slightly <br /> g <br /> dense; wet; dark gray; flowing sand. <br /> 43 - 44 .5 CL Sandy clay: soft; wet; medium yellow-gray. <br /> 7 <br /> I 49 <br /> 7 <br />