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OB-3 Drilled August 2 , 1988 <br /> ----------------------------- <br /> Depth <br /> Interval USCS <br /> (feet) Symbol Description <br /> ---------------------------- <br /> 0 - 7 ML Sandy silt: well graded; medium dense; <br /> slightly moist; medium brown. <br /> 7 - 15 ML Sandy silt: well graded; medium dense; <br /> slightly moist; medium gray. <br /> 15 - 23 SP Sand: moderately graded; medium dense; very <br /> moist; medium gray. <br /> 23 - 29 ML Clayey silt: well graded; medium dense; <br /> very moist; medium brown. <br /> 29 - 30 CL Silty clay: very stiff; moist; medium <br /> yellow-gray; moderately plastic. <br /> 30 - 33 ML Clayey silt: well graded; medium dense; very <br /> moist; medium brown. <br /> 33 - 41 SW medium sand: well graded; loose; wet; medium <br /> brown. <br /> _ 4.1 - 43 CL Sandy clay: hard; wet; medium yellow-gray. <br /> 40 <br />