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OB-16 Drilled August 3 , 1988 <br /> -------------------------------------------------------------- <br /> Depth <br /> Interval USCS <br /> (feet) Symbol Description <br /> --------------------------------------------------=----------- <br /> 0 - 10 Fill (silt, gravel concrete scraps) slightly <br /> dense; slightly moist. <br /> 10 - 15 ML Silt: well graded; slightly dense; <br /> moderately moist; dark brown. <br /> 15 - 50 SW Medium sand: well graded; loose; wet; medium <br /> gray; flowing sand. <br /> I <br /> i <br /> I <br /> i <br /> 52 <br /> I <br />