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Table i 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 Diethyl 2-HEX Lab ID Sampling Elevation Water Water (ppb) (Ppb) (ppb) (ppb) benzene Xylenes ooloform (ppb) (ppb) Phthalate (ppb) (feet) (feet) Elevation (ppb) (ppb) (ppb) (ppb) feet AW-2 05x27/93 11.15 22.03 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - - - - - SEQ (con't) 10128/93 11.52 21.66 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - - - - -- SEQ AW-3 1002190 32.62 11.42 21.20 4,200 10,000 0.5 3.5 4.9 21 ND<22 ND<10 - - - AEL 11/21/90 - - - - - - - - ND<2 - - - - Pace 02106191 11.73 20.89 ND<300 9,800 ND<2.5 ND<2.5 ND<2.5 ND<5.0 ND<2 ND<500 - - - AEL 05107/91 32.18 11.14 21.04 210ND<50 ND<0.3 ND<0.3 0,3 0.8 ND<2 - - - - SAL 08/21/91 11.05 21.13 620"" 22,000 ND<0.60 ND<0.60 ND<0.60 0.70 - - - - - SEQ 11128/81 11.67 20.51 610 2,600 ND<0.30 ND<0.30 ND<0.30 0.48 - - - - SEQ 02121/92 11.37 20.81 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 - - - - --- SEQ f 04107/92 32.68 11.63 21.05 ND<30 75 ND<0.30 ND<0.30 ND<0.30 0.48 - - - - -- SEQ 04/24/92 11.62 21.06 120- 1,400 ND<0.30 ND<0.30 ND<0.30 ND<0.30 --- - - - - SEQ 07/21192 11.67 21.01 ND<50 870 ND<0.5 ND<0.5 NN0.5 ND<0.5 - - -- - - SEQ 10121/92 11.73 20.96 65 SW ND<0.5 ND<0.5 ND<0.5 ND<0.5 - - - - -- SEQ 01122/93 11.01 21.67 ND<50 320 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - - ND<2-0 ND<2.0 ND<5.0 SEG} 04/02193 11.34 21.34 ND<50 120 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - - - - SEQ 05127/93 11.39 2129 ND<50 210 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - - - - -- SEQ 10128/93 10.70 21.98 ND<50 91 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - - - -- - SEQ AW-4 10/02/90 32.67 10.99 21.68 ND<50 ND<50 ND<0,3 ND<0.3 ND<0.3 ND<0.3 --- ND<10 - - -- AEL 02/06/91 10.86 21.81 ND<50 ND<200 NN0.5 ND<0.5 ND<0.5 ND<0.5 - ND<500 - - - AEL 05107/91 32.76 10.54 22.22 ND<50 ND<50 ND<0.3 ND<0.3 ND<0.3 ND<0.3 - - - - - SAL 08/21191 10.60 22.18 ND<30 ND<60 ND<0.30 ND<0.30 NDc0.30 ND<0.30 - - - - - SEQ 11126191 11.14 21.62 ND<30 100 ND<0.30 ND<0.30 ND<0.30 ND<0.30 - - - ..... - SEQ 02/21/92 10.69 22.07 ND<30 ND<60 NN0,30 ND<0,30 ND<0.30 ND<0.30 - - -- - - SEO 04107/92 3326 11.01 22.25 ND40 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 - - - - - SEO 04124/92 11.01 2225 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 - - - - - SEO NOTES: ppb - parts per billion Gtpq} Top of wising elevations were surveyed In reference to a railroad spike set in an TPH-G - total petroleum hydrocarbons as gasoline Island on the appro timate centerline of East Grandine Road 19.5 feet west from the TPH-D - total petroleum hydrocarbons as diesel centerline of ft railroad spur tracks. ND - not detected at detection llmlls stated In official laboratory reports All wellsresurveyedon Aprll7',1992 by Land hrprovornentSendees Apo17,and24, - not measured►not analyzedinot appllcable 1992 data refleet resurveyed elevations. 2-HEX - R1-texen-1-o1(E) - sample reported as not matching typical gasollno patfom sampled reported as not appearing to contain gasollne AEL - American Environmental Laboratories,Inc. SAL = Superior Analytical Labombles,Inc. SEQ - Sequoia Anakftal l4' ff Page 2 of 5 30-IMAawTARLE 1ZDM