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TablJ* Summary of Ground Water Monitoring and Analyses Former Mobil Oil Bulk Plant 04-343 500 East Grantline Road ` Tracy, Califomia f Well Data of Casing Depth to Ground TPH-G TPH-D Benzene Toluene Ethyl- Total F9cal Lead Phenol Diethyl 2-HEX Lab ID Sampling Elevation Water Water (ppb) (ppb) (ppb) (ppb) benzene Xylenes coloform (ppb) (ppb) Phthalate (ppb) (Feet) (feet) Elevation (Ppb) (ppb) (Ppb) (Ppb) AW-8 01122/93 9.29 19.67 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - --- ND<2.0 ND<20 37 SEQ (coni) 04102/83 9.64 19.32 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<o.5 - --- - - - SEQ 05127/93 9.73 1923 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - - -- - - SEQ 10128/93 10.10 18.86 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - -- - - SEQ AW-9 04107192 31.26 10.09 21.17 72 65 15 ND<0.30 5.1 1.3 - --- - - SEQ 04/24192 10.10 21.16 ND<30 130 5.5 0.35 1.2 0.39 - - --- - - SEQ 07/21192 10.12 21.14 ND<50 ND<50 0.74 ND<0.5 ND<0.5 ND<0.5 - -- - - - SEQ 10121/92 10.20 21.06 ND<50 ND<50 1.2 ND<0.5 ND<0.5 ND<0.5 - - - - - SEQ 01/22/93 9.51 21.75 ND<50 ND<50 0.70 ND<0.5 ND<0.5 ND<0.5 - - ND<2.0 NDaO ND<5.0 SEQ 04!02!93 9.81 21.45 ND<50 ND<50 1.5 ND<0.5 0.58 ND<0.5 -- - - - SEQ 0527/93 9.87 21.39 ND<50 ND<50 3.4 ND<0.5 ND<0.5 ND<0.5 - --- - - -- SEQ 10/28/93 10.18 21.10 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - - - - - SEQ y AW-10 0410?J93 31.48 10.10 21.36 ND<50 92 0.54 ND<0.5 ND<0.5 ND<0.5 - -•- - - - SEQ 05127/93 10.14 21.34 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - - - - - SEQ 10/28/93 10.42 21.06 ND<50 190 0.78 ND<0.5 ND<0.5 ND<0.5 - -.- - - - SEQ AW-11 04102/93 31.00 9.58 21.42 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - - - - - SEQ 05127/93 9.52 21.38 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - - - - - SEQ 10/28/93 10.46 20.54 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - - - - - SEQ AW-12 04102/93 31.56 10.00 21.58 ND<50 63 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - -- - - SEQ 06!27193 10.08 21.48 ND<60 ND<50 9.6 ND<0.6 ND<0.6 ND<0.5 - -- - ... - SEQ 10128M 10.42 21.14 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - - - - - SEQ NOTES: ppb parts per billion(legal) Top of casing elevations were surveyed in reterenoe b a railroad spi33 set in an TPH-G a total petroleum hydrocarbons as gasoline island on rhe app mdmale cent"ne of East Granttine Road 19.5 feet wast from the TFFI-D - totaltroleum fl pe ydrocarbons as diesel centerllrte of the railroad spur tracks. ND n not detected at detection limits stated InafAclallaborabryreports AllwellsresurveyedonApril 7,1992byLand ImprovementServices.April?,and24, - m not measureftot analyzedrnot applicable 1992 data reflect resurveyed elevatlorrs. 2-HDC a 2-Hexen-1-ol(E) I. .. . sample reported as not matching typkal gasoline pattern a sampled reported as riot appearing to Coontain gwollne AEL . American Environmental Laboratories,Inc. SAL . Superior Analytical Laboratories,Inc. 13EQ - Se9uolaAnalytical h Page 5 of 5 30-136OW TABLE 1210ew