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TWO Summary of Ground Water Monitoring and Analyses Former Mobil Oil Bulk Plant 04-343 500 East Grantline Road Tracy, Califomia Weil Date of Casing Depth to Ground TPF!-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 coioform (ppb) (ppb) phthalate (fest) (fest] Elevation (ppb) (ppb) (Ppb) (ppb) Got (PPb� j AW-8 11/26/91 10.04 18.42 ND<30 100 ND<0.30 ND<0.30 ND<0.30 ND<0.30 _ (con't) 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 04124/92 10.03 18.93 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 - SEQ 07120192 10.07 18.89 ND<50 63 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - - - SEQ 10121/92 10.09 18.87 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - - -' SEQ 01122/93 9.29 19.67 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - - - SEQ 04/02/93 9.64 19.32 ND<50 ND<50 ND<0.5 ND<0.5 ND - NDd.O NDc2.0 37 SEQ 05127/93 9.73 1923 ND<50 ND<50 ND<o.5 ND<o.5 ND<o.5 ND<0.5 - - - - SEQ 10V2a/93 10.10 18.86 ND<50 ND<50 ND-c0.5 ND<0.5 ND<0.5 ND<0.5 w _ - - SEQ EQ 01121/94 10.11 18.85 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<o.5 - ,- SEQ - - - SEQ AW-9 04107192 3128 10.09 21.17 72 65 15 N D<0.30 5,1 1.3 04/24/92 10.10 21.16 ND<30 130 5.5 0.35 1.2 0.39 - _- SEQ 07/21/92 10.12 21.14 ND<50 ND<50 0.74 ND<0.5 ND<0.5 ND<0.5 - _- _ SEQ 10/21/92 10.20 21.06 ND<50 ND<50 1.2 Nb<0.5 ND<o.5 NDco.S _ - SEQ 01122193 9.51 21.75 ND<50 ND<50 0.70 ND<0.5 ND<0.5 ND<0.5 _ - - - SEQ 04102!93 9.81 21.45 ND<5o ND<50 1.5 ND<0.5 0.58 ND<0.5 NDQ 0 NDa 0 NDc5.0 SEQ 05/27193 9.87 21.39 ND<5o ND<50 3.4 ND<0.5 ND<0.5 ND<0.5 - - SEQ 10128/93 10.16 21.10 ND<50 ND<50 ND<0.5 ND<0.5 ND<o.5 ND<o.5 - - - - SEQ 01!21/94 10.15 21.11 ND<50 ND<50 ND<0.5 ND<0.5 No<o.5 ND<o.5 - - - - -' SEQ SEQ AW-10 04/02/93 31.48 10.10 21.38 ND<50 05127/93 920.54 ND<0.5 ND<0.5 ND<0.5 - 10.14 21.34 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<o.5 - - SEQ 10118/93 10.42 21.06 ND<50 190 - - - - SEQ 01121!94 0.76 ND<0.5 ND<0.5 ND<0.5 - - - 10.42 21.06 ND<50 ND<50 ND-c0.5 ND<0.5 ND<0.5 ND<0.5 - .� - - SEQ - - SEQ If NOTES: ppb a parts per billion(µfill) i TPH-0 a totej petroleum hydrocarbons as gasoline Top of casing elevations were surveyed In reference to a railroad spike set In an TPH-D - total petroleum hydrocarbons as diesel island on the approxkr"centerline of East Grantline Road 19.5 feet west{rum the ND = not centerline of the ralroad spur tra detected at detecibn limits stated!n officfaf labvrato re �. = not measured/not analyzedlnot applicable ry P All wells resurveyed on April 7.199Z by Land lmprovementServioas.April?artd 24, 2-HEX = 2-Hellen-1_ol(E7 1982,data reflect resurveyed elevatbns, F a sample reported as not matching typical gasoline patter O sampled reported as not appearing t0 contain gesollne AEI. - American Environmental Laboratories,Inc. 13AL a Superior Analytical Laboratories,Inc. SEQ = Sequoia Ana"cal Page 5 of e sr-issrowwrAar.E 0MT/A1 i