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Tab* Summary of Ground Water Monitoring and Analyses Former Mobil Station 04-343 500 East Grantline Road Tracy,California Well Date of Casing Depth to Ground TPH-G TPH-D Benzene 1 Toluene Ethyl- Total Fecal 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) I I AW-3 10/02/90 32.62 11.42 21.20 4200 10000 0.5 3.5 4.9 21 ND<2.2 ND<10 - - - AEL 11/21/90 - - - - - - - - ND<2 -- - -- -- PACE 02/06/91 11.73 20.89 ND<300 9800 ND<2.5 ND<2.5 ND<2.5 ND<5.0 ND<2 ND<500 - -- - AEL 05/07/91 32.18 11.14 21.04 210' ND<50 ND<0.3 ND<0.3 0.3 0.8 ND<2 -- -- - -- SAL 08/21/91 11.05 21.13 620" 22000 ND<0.60 ND4.60 ND<0.60 0.70' - - - - - SEQ 11/26/91 11.67 20.51 610 2600 ND<0,30 ND<0.30 ND<0.30 0.48 - - - -- - SEQ 02/21/92 11.37 20.81 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 - - - -- - SEQ 04/07/92 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" 1400 ND<0.30 ND<0.30 ND<0.30 ND<0.30 - - - -- - SEQ 07121192 11.67 21.01 ND<50 870 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - - - - - SEQ 10/21/92 11.73 20.95 65 880 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - - - - - SEQ 01!22!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 SEQ 04/02/93 11.34 21.34 ND<50 120 ND<0.5 ND<0.5 ND<0.5 ND<0.5 -- - -- - - SEQ I 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 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - ND<500 - - -- AEL 05/07/91 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 22.16 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 Np<0.30 -- - - - - SEQ 11/26/91 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<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 - - - - SEQ 04/07192 33.26 11.01 22.25 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 - - SEQ 04/24/92 11.01 22.25 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 -- - - - - SEQ 07/20/92 11.14 22.12 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - - -- - --- SEQ 10121/92 11.22 22.04 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - - - - -- SEQ 01122/93 10.17 23.09 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - - 3.6 ND<2.0 ND<5.0 SEQ 04/02/93 10.61 22.65 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - - - - - SEQ NOTES; ppb = parts per billion(pglkg) Top of casing elevations were surveyed in reference to a railroad spike set in an TPH-G = total petroleum hydrocarbons as gasoline island on the approbmata centerline of East Grantline Road 19.5 feetwest from the -D = total petroleum hydrocarbons as diesel centerline of the railroad spur tracks. TPH p ND = not detected at detection limits stated in official laboratory reports All weils resurveyed on Aprii 7,1992 by Land Improvement Services,Apri17,and24, = not measureftot anatyzed(not applicable 1992 data reflect resurveyed elevations. 2-IiEX = 2-Hexen-1-ol(E) = sample reported as not matching typical gasoline pattern = sampled reported as not appearing to contain gasoline AEL = American Environmental laboratories,Inc. SAL = Superior Analytical Laboratories,Inc. SEQ = Sequoia Analytical Page 2 of 4 30-MUW TABLE UIW93