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OB-18 Drilled July 26, 1988 <br /> --------------------------------------- <br /> Depth <br /> Interval USCS <br /> (feet) Symbol Description <br /> ------------------------------------------ <br /> 0 - 5 ML Silt: well graded; slightly dense; slightly <br /> moist; medium yellow-gray. <br /> 5 - 10 GM Gravelly silt: poorly graded; slightly <br /> dense; moderately moist; medium yellow-gray. <br /> 10 - 15 SW Coarse sand: well graded; medium dense; <br /> moderately moist; medium yellow-gray. <br /> 15 - 33 SW Medium sand: well graded; medium dense; <br /> moderately moist; medium yellow-gray. <br /> 33 - 42 SW Medium sand: well graded; dense; wet; medium <br /> yellow-gray. <br /> 42 - 46 ML Clayey silt and sand: poorly graded: medium <br /> dense; wet; medium yellow-gray. <br /> 46 - 49 . 5 SW Sand: well graded; slightly dense; wet; <br /> medium yellow-gray. <br /> 54 <br />