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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 Toluene Ethyl- Total Fecal Lead Phenol Diethyl 2-HEX Lab 1D Sampling Elevation Water wafer (ppb) (ppb) (ppb) (ppb) benzene Xylenes coloform (ppb) (ppb) Phthalate (ppb) (feet) (feet) Elevation (ppb) (Ppb) (ppb) (ppb) (feetAW-7 07/20/92 10.22 19.88 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - - - - - SEQ (con't) 10/21/92 10.25 19.85 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - - - - - SEQ 01/22993 9.64 20.46 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 04/02/93 9.94 20.16 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 -- - - -- - SEQ AW-8 05/07/91 28.46 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 ND<0.30 ND<0.30 ND<0.30 ND<0.30 - - - - - SEQ 11/26/91 10.04 16.42 ND<30 100 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 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 - - - - - SEQ 04/24/92 10.03 18.93 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 - - - _ - SEQ 4 07/20/32 10.07 18.89 ND<50 63 ND<0.5 ND<0.5 ND<o.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 01/22/93 9.29 19.67 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0,5 -- - ND<2.0 ND<2.0 37 SEQ f 04/02/93 9.64 19.32 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - - - - - SEQ AW-9 04/07/92 31.26 10.09 21.17 72 65 15 ND<0.30 5.1 1.3 - - - - --- SEQ 04/24/92 10.10 21.16 ND<30 130 5.5 0.35 1.2 0.39 - - - - - SEQ 07121/92 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 01122/93 9.51 21.75 ND<50 ND<50 0.70 ND<0.5 ND<0.5 ND<0.5 -- - ND<2.0 ND<2.0 ND<5.0 SEQ 04/02/993 9.61 21.45 ND<50 ND<50 1.5 ND<0.5 0.58 ND<0.5 - - - -- - SEQ AW-10 04/02/93 - 10.10 - ND<50 92 0.54 ND<0.5 ND<0.5 ND<0.5 - - - - -- SEQ AW-11 04/02193 - 9.58 -- ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 -- - -- - - SEQ AW-12 04!02193 L - 1 10.00 1 - I ND<50 1 63 1 ND<0.5 I ND<0.5 I ND<0.5 I ND<0.5 I - I SEQ NOTES: ppb = parts per billion(µgag) 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 Grantline Road 19.5 feet west from the TPH-D = total petroleum hydrocarbons as diesel centerline 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 Improvement5ervices.April 7,and24, = not measuredhtot analyzed/not applicable 1992 data reflect resurveyed elevations. 2-HEX = 2-Hexen-1-of(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 Ana"cal Rage 4 of 4 30-13&GwtASLE SriV93