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OB-6 Drilled July 28 , 1988 <br /> -------------------------------------------------------------- <br /> Depth <br /> Interval USCS <br /> (feet) Symbol Description <br /> -------------------------------------------------------------- <br /> 0 - 5 ML Silt: well graded; slightly dense; very- <br /> slightly moist; medium yellow-gray. <br /> 5 - 12' SW Sand: well graded; medium dense; moderately <br /> moist; medium yellow-gray. <br /> 12 - 17 SW Sand: well graded; medium dense; moderately <br /> wet; medium yellow-gray. <br /> 17 - 29 SC Clayey silt and sand grading into silty, <br /> sandy clay: poorly graded; medium dense; <br /> very moist; medium yellow gray. <br /> 29 - 50 SW Sand: well graded; slightly dense; wet; <br /> medium yellow-gray. <br /> 43 <br />