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E TablJ9 0 Summary of Ground Water Monitoring and Analyses Former Mobil Oil Bulk Plant 04.343 500 East Grantline Road Tracy,California Well Date of Casing Depth to Ground TPH-G TPH-D Benzene Toluene Ethyl- Total Fecal Lead Phenol Diethy! 2-HEX 1 Lab ID Sampling Elevation Water Water (ppb) (ppb) (ppb) (ppb) benzene Xylenes coioforrn (ppb) (ppb) Phthalate (ppb) (feet) (feat) Elevation (ppb) (Ppb) (Ppb) (ppb) fest AW-6 10021/92 10.92 19.17 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - -- - - - SEQ (don't) 01/22/93 14.30 30.09 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.6 - - ND<Po 14 ND<S.o SEa 04/02193 10.58 19.51 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - - - - -- SEQ 05127/93 10.61 19.48 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 -- - - - --- SEQ 10128193 10.86 1923 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - -- - - - SEC) AW-7 05X7/91 29.60 9.73 19.87 ND<50 N0<50 ND<0.3 ND<0.3 ND<0.3 ND<0.3 N13<2 - - - - SAL 48121/91 9.63 19.97 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 - - - - SEQ 11/28/91 1021 19.39 ND<30 300 ND<0.30 ND<0.30 ND<0.30 ND<0.30 - - -- - - SEQ 02121/92 9.97 19.63 ND<30 ND<50 ND<o.30 ND<0.30 ND<0.30 ND<0.3o - - - -- - SEa 04/07/92 30.10 10.22 19.88 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 - - - - - SECI 04124!92 10.21 19.89 ND40 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 - - - - SEQ 07rLW92 10.22 19.88 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - - - - - SEQ 10121/92 10.25 19.85 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - -- - - - SEQ 011'22193 9.64 20.48 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - - ND<2.0 NDQ.O ND<5.0 SEQ 04/02/93 9.94 20.16 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - - - - -- SEQ 05/27/93 9.98 20.12 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - - -- - - SEQ 10128M 10.20 19.90 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - - -- - - SEQ AW-8 05107/91 28.48 9.55 18.91 ND<50 ND<50 ND<0.3 ND<0.3 ND<0.3 ND<0.3 ND<2 - -- - - SAL 08/21/91 9.48 18.98 ND<30 ND<50 N0<0.30 ND<0.30 ND<0.30 ND<0.30 - - - -- - SIM 11126/91 10.04 18.42 ND40 100 ND<0.30 ND<0.30 ND<0.30 ND<0.30 - SEQ 02121/92 9.74 18.72 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 --- - - - - SEQ 04/07/92 28.96 10.05 18.91 ND40 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 - - - - - SEQ 04!24192 10.03 16.93 ND-c30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 - - - - SEQ 07120/92 10.07 18.89 ND<50 63 ND<0.5 ND<0.5 ND<0.5 ND<0.5 --- - - _. - SEQ 10/21/92 10.09 18.87 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - - - - - SEQ i NOTES: Ppb parts per billion 4Lg4) Top of a sing elevations were surveyed in reference ID a railroad spice set In an TPH-G total petroleum hydrocarbons as gasoline Island on the appraatrnats centerline of East Grantline Road 19.5 feetwest from the TPH-D = total petroleum hydrocarbons as diesel centerline of the railroad spur tracks. ND not detected atdetectionlimitsstated in official laboratoryreports AllwellsresurveyedonApril7,1992byLand tmprovemantServlctmAprii7,and24, M - not measured►not analyAedlnot applicable 1992 data reflect resufveyed elevations. 2-HEX 2-Hexen-1-01(E) = sample reported as not matching typical gasoline pattern " sampled reported as not appearing to contain gasoline AEL m American Environmental Laboratories,Inc. SAL v Superior AnalyUcal Laboratories,Inc, SEQ = Sequola Analytical Page 4 of 5 aaraeraw TAt>E tZVM I !