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r � Tab* Summary of Ground Water Monitoring and Analyses Former Mobil Station 04-343 500 East Gran#line Road Tracy, California Well Date of Casing Depth to Ground TPH-G TPN-D Benzene Toluene Ethyl- Total Fecal Lead Phenol Diethyl 2-HEX Lab ID Sampling Elevation Water Water (ppb) (ppb) (ppb) (ppb) benzene Xylenes cwloform (ppb) (ppb) Phthalate (ppb) (feet) (feet) Elevvaation (ppb) (ppb) (Ppb) (Ppb) AW-5 05/07/91 30.61 1021 20.40 ND<50 ND<50 ND<0.3 ND<0.3 ND<0.3 ND<0.3 ND<2 - -- - - SAL 08/21/91 10.07 20.54 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 - - - - - SEQ 11/26/91 10.69 19.92 ND<30 370 ND<0.30 ND<0.30 ND<0.30 ND<0.30 - - - - - SEQ 02/21/92 10.43 20.18 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 - - - - - SEQ 04/07/92 31.11 10.72 20.39 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 - - - - -- SEQ 04/24/92 10.71 20.40 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 - - - - - SEQ 07/20/92 10.79 20.32 ND<50 ND<50 ND<0.5 ND<0,5 ND<0.5 ND<0.5 -- - - - -- SEQ 10/21/92 10.78 20.33 ND<50 96 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - - - - - SEQ 01!22193 10.09 21.02 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 04/02193 10.48 20.63 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 -- - - - - SEQ I AW-6 05/07/91 29.59 10.37 19.22 ND<50 ND<50 ND<0.3 ND<0.3 ND<0.3 ND<0.3 ND<2 - - - -- SAL 08121/91 1025 19.34 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 - - - - - SEQ 11/26/91 10.88 18.71 ND<30 170 ND<0.30 ND<0.30 ND<0.30 ND<0.30 - - - - - SEQ 02/21192 10.64 18.95 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 - - - - - SEQ 04/07/92 30.09 10.89 19.20 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 - -- - - - SEQ 04/24/92 10.88 19.21 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 - - - - - SEQ 07/20/92 10.85 19.24 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 -- - - - - SEQ 10/21/92 10.92 19.17 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - - - - - SEQ 01/22/93 10.30 30.09 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - - ND<2.0 14 ND<5.0 SEQ 04/02/93 10.58 19.51 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - -- - - - SEQ AW-7 05/07/91 29.6 9.73 19.87 ND<50 ND<50 ND<0.3 ND<0.3 ND<0.3 ND<0.3 ND<2 - - - -- SAL 08/21/91 9.63 19.97 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 --- - - - - SEQ 11/26/91 10.21 19.39 ND<30 300 ND<0.30 ND<0.30 ND<0.30 ND<0.30 - - - - - SEQ 02/21/92 9.97 19.63 ND<30 ND<50 ND<o,30 ND<0.30 ND<0.30 ND<0.30 - -- - - - SEQ 04/07/92 30.1 10,22 19.88 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 -- - - - - SEQ 041241'92 1 10.21 1 19.89 1 ND<30 I ND<50 I ND<0.30 ND<0.30 ND<0.30 I ND<0.30 I I - I - --- SEQ NOTES: ppb = parts per billion(4kg) Top of casing elevations were surveyed in reference to a railroad spike set in an TPH-G = lotal petroleum hydrocarbons as gasoline island on the approhamate centerline of East Grantline Road 19.5 feetwest from the TPH-D = total petroleum hydrocarbons as diesel oenterEine 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.Apr!!7,and 24, - = not measured/not analyzed/not applicable 1992 data reflect resurveyed elevations. 2-HEX = 2-Haxen-1-oi(E) ' = sample reported as not matching typical gasoline patter i I. = sampled reported as not appearing to contain gasoline AEL = American Environmental Laboratories,Inc, SAL = Superior Analytical Laboratories,Inc. SEQ = Sequoia Analytical I. Page 3 of 4 3D-136/GWTABLE 5118M3