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a <br /> Table 1-3 <br /> SUMMARY OF GROUND WATER MONITORING AND SAMPLING RESULTS <br /> Former Mobil Bulk Plant 04-343 <br /> Tracy, California <br /> Casing Depth to Ground Water Ethyl- Total 1 <br /> Well Month) Elevation Water Elevation TPH-G TRH-D Benzene Toluene benzene Xylenes <br /> Number Year feet feet � feet _ b) 1b �ib (PPb} � .. {per <br /> AW-9 04,107/92 31.26 10.09 21.17 72 65 15 ND<0.30 5.1 1.3 <br /> 04/24/92 10.10 21.16 ND<30 130 5.5 0.25 1.2 0.39 <br /> 07/20/92 10.12 21.14 ND<50 63 0.74 ND<0.5 ND<0.5 ND<0.5 <br /> W21/92 10.20 21.06 ND<50 ND<50 1.2 ND<0.5 ND<0.5 ND<0.5 <br /> 01/22/93 9.51 21.75 ND<50 ND<50 0.70 ND<0.5 ND<0.5 ND<0.5 <br /> 04102/93 9.81 21.45 ND<50 ND<50 1.5 ND<0.5 0.58 ND<0.5 <br /> 05/27/93 9.87 21.39 ND<50 ND<50 3.4 ND<0.5 ND<0.5 ND<0.5 <br /> AW-10 04102/93 31.48 10.10 21.38 ND<50 92 0.54 ND<0.5 ND<0.5 ND<0.5 <br /> 05/27/93 10.14 21.34 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 <br /> AW-11 04/02/93 31.00 9.58 21.42 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 <br /> 05/27/93 9.62 21.38 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 <br /> I I <br /> AW-12 04102/93 31.56 10.00 21.56 ND<50 63 ND<0.5 ND<0.5 ND<0.5 ND<0.5 <br /> 05/27/93 10.08 21.48 ND<50 ND<50 9.6 ND<0.5 ND<0.5 ND<0.5 <br /> h Notes: TPH-G = total petroleum hydrocarbons as gasoline <br /> TPH-D = total petroleum hydrocarbons as diesel <br /> ppb = parks per billion <br /> ND = riot detected at limit indicated on official laboratory report <br /> ` W sample reported as not matching typical gasoline pattern <br /> " = siunple reported as not appearing to contain gasoline <br /> 30-013606/93 <br /> I { <br /> I <br /> 9 <br /> Page 5of5 <br />