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OB-12 Drilled July 22 , 1988 <br /> -------------------------------------------------------------- <br /> Depth <br /> Interval USCS <br /> (feet) Symbol Description <br /> -------------------------------------------------------------- <br /> 0 - 9 ML Silt: well graded; slightly dense; very <br /> slightly moist; light yellow-gray. <br /> 9 - 14 , ML Silt: well graded; slightly dense; <br /> moderately moist; dark gray. <br /> 14 - 16 ML Silt: well graded; loose dense; moderately <br /> moist; dark gray. <br /> 16 - 23 ML Silt: well graded; slightly dense; wet; dark <br /> gray. <br /> 23 - 25 GM Silt and small gravel: poorly graded; dense; <br /> moderately moist; dark gray; some clayey silt <br /> lenses. <br /> 25 - 30 ML Silt: well graded; dense; moderately moist; <br /> dark gray. <br /> 30 - 33 ML Silt: well graded; dense; wet; dark gray. <br /> 33 - 45 SW Fine to medium sand: well graded; loose to <br /> slightly dense; wet; light yellow gray. <br /> 48 <br />