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Tablif 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 Toluene Ethyl- Total Fecal Lead Phenol Diethyl 2-HEX Lab ID Sampling Elevation Water Water (ppb) (ppb) (ppb) (ppb) benzene Xylenes ootoform (ppb) (ppb) Phthalate (ppb) (feet) (feet) Elevation (ppb) (ppb) (ppb) (ppb) AW-1 10102!90 32.97 11.65 21.32 ND<50 ND<50 ND<0.3 ND<0.3 ND<0.3 ND<0.3 ND<2.2 ND<10 - - - AEL 11/21190 - - - -- - - - - 11 -- - - •- PACE 02/06/91 11.48 21.49 ND<50 ND<200 ND<0.5 ND<0.5 ND<0.5 ND<0.5 ND<2 ND<500 - - - AEL 05/07/91 31.54 11.37 20.17 ND<50 ND<50 ND<0.3 ND<0.3 ND<0.3 ND<0.3 ND<2 - - - - SAL 08/21191 11.28 2026 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 - - - - - SEQ 11/26/91 11.90 19.64 ND<30 480 ND<0.30 ND<0.30 ND<0.30 ND<0.30 - - - - - SEQ 02/21/92 11.64 19.90 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 - - - - -- SEQ 04/07/92 32.96 11.85 21.11 ND<30 NNW ND<0.30 ND<0.30 ND<0.30 ND<0.30 - - - - - SEQ ; a 04/24/92 11.84 21.12 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 - - -- - SEQ 07/20192 11.66 21.10 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 -- - - - - SEQ 10/21/92 11.94 21.02 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - - - - - SEQ 01122/93 11.29 21.67 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - -- ND<2.0 ND<2.0 ND<5.0 SEQ i 04/02193 11.61 21.35 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - - - - - SEQ I AW-2 10/02/90 33.16 11.37 21.79 ND<50 ND<50 ND<0.3 ND<0.3 ND<0.3 ND<0.3 --- ND<10 - - - AEL 02/06/91 11.30 21.86 ND<50 ND<200 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - ND<500 - - - AEL 05/07/91 32.68 10.94 21,74 ND<50 ND<50 ND<0.3 ND<0.3 ND<0.3 ND<0.3 - - - - - SAL, I 08121191 10.96 21.72 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 - -- - - - SEQ 11/26/91 11.53 21.15 ND<30 99 ND<0.30 ND<0.30 N0<0.30 ND<0.30 - - - - - SEQ 02/21/92 11.10 21.58 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 SEQ 04/07/92 33.18 11.41 21.77 ND<30 ND<5o ND<0.30 ND<0.30 ND<0.30 ND<0.30 - - - - - SEQ 04/24/92 11.40 21.78 ND<30 ND<50 ND<0.30 ND<0.30 N13<0.30 ND<0.30 - - - -- - SEQ 07/20/92 11.50 21.68 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - -- - - - SEQ 10/21/92 11.61 21.57 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 -- - - - - SEQ 01122!93 10.66 22.52 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - -- ND<2.0 ND<2.0 ND<5.0 SEQ - - - - 11 04/02/93 11.06 72.12 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 -- SEQ , NOTES: ppb = parts per billion(pgft) 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 approximate centerline of East Crantline Road 19.5 feet west from the TPH-D = total petroleum hydrocarbons as diesel centedine of the railroad spur tracks. ND = not detected at detection limits stated in official laboratory reports All wells resurveyed on April 7,1992 by Land Improvement Services.ApH17,and24, --- = not measuredlnot analyzedlnot applicable 1992 data reflect resurveyed elevations. 2-HEX = 2-Hexen-i-o)(E) = sample reported as not matching typical gasoline patter = sampled reported as not appearing to contain gasoline AEL = American Environmental Laboratories,Inc. SAL = Superior Analytical Laboratories,Inc. SEQ = Sequoia Analytical j: Page 1 of 4 30.13&GW TABLE 5(18/93