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_ _ _ as-vs _ sz rr <br /> LITHOLOGY <br /> About 1 1/2' of rubble capped by degraded asphalt covered <br /> the surface of the area. From ground level down: fine- <br /> grained, brown-tan silt from -1 1/2' to -6 1/21 ; blue, <br /> "gumbo" clay from -6 1/2' to -131 , very moist; <br /> ate-131d at a <br /> black clay, wet, in water table at --13' , p <br /> maximum about one foot. The water table probably connects <br /> directly with the nearby river channel and is believed to be <br /> susceptible to tidal variations. <br /> After sampling was completed, about 3 to 4 cu. yds. of silt, <br /> located under the water pipeline, slumped suddenly into the <br /> hole without any prior indication, showing an instability in <br /> the soil and the need for refilling as soon as feasible. <br /> The approximate slump area is shown on Figure 2, as are the <br /> soils described. <br /> TESTS RESULTS <br /> Three tables are presented below, Table A shorts the results <br /> of the soil sample tests; Table B, the water samples, and <br /> Table C, the spoil pile samples. <br /> All tests, at the detection limits, showed no detectable <br /> contamination for either BTEX or TPH(D) . <br /> TABLE A <br /> TESTS ON SOILS FROM THE PIT SMALLS AND BOTTOM <br /> Units: ug/kg = ppb; mg/kg = Ppm <br /> ND = Not detectable at level shown <br /> Sample Date: 5/B/91 <br /> Detect. Detect. <br /> Benzene Toluene E'Benzene Xylene Limit TPH(D) Limit <br /> mg/kg mg/kg <br /> Method 8020 Method 5030 <br /> N-61 ND ND ND ND .005 ND 1 <br /> W-8, „ <br /> N-13' <br /> 5-13' „ <br /> W-13' „ <br /> BTM. <br /> MID. " <br /> W-14' , <br /> E-14' <br /> 4 <br />