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TWO Summary of Ground Water Monitoring and Analyses Former Mobil Oil Bulk Plant 04-343 500 East Grantline Road Tracy,California Well Data of Casing Depth to Ground TPH-G TPH-D Benzene Toluene Ethyl- Total 1 Fecal Lead Phenol Diethyl 2-HEX Crab ID Sampling Elevation Water Elevation ater (ppb) (ppb) (ppb) (ppb) benzene Xylenes coloform (ppb) (ppb) Phthalate, (ppb} (feet) (tet) test (Ppb) (Ppb) (Ppb) (ppb) AW 1 10102/90 32.97 11.65 21.32 ND<50 ND<50 - - ND<0.3 ND-co-3 ND<0.3 ND<0.3 ND22 ND<101 /21/90 - AEL - 11 - - -- Paas 02/06/91 11.48 21.49 ND<50 NDd00 ND<0.5 ND<0.5 ND<0.5 ND<0.5 ND<2 ND<500 -- - AEL 05db7/91 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!21/91 11.28 20.28 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 - - - SEQ 11$'26191 11.90 19.64 ND<30 480 ND<0.30 ND<0.30 ND<0.30 ND<0.30 - - _ SEQ 02121/92 11.64 19.90 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 04/07/92 32.96 11.85 21.11 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 - - - SEQ ��2 11.84 21.12 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 N - - - - SEQ D<0.30 SEQ 071'20192 11.86 21.10 ND<50 ND<50 NDi0.5 ND<0.5 ND<0.5 - - - - NpN.5 - 10/21/92 11.94 21.02 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - - SEQ 0122193 - - - - - SEQ 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.o ND-c5.0 SEQ 04/02f93 11.61 21.35 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 SEQ 05127/93 11.62 21.34 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - - - w -_ SEQ 10128/83 11.88 21.08 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 _ SEQ 01/21/94 11.90 21.08 ND<50 ND<50 ND4.5 ND<0.5 ND<0.5 ND<0.5 - - - - SEQ AW-2 14102/90 33.16 11.37 21.79 ND<50 ND<50 ND<0.3 ND<0.3 ND<0.3 ND<0.3 - ND<10AEL II 02/08/91 11.30 21.86 ND<50 ND-d.00 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 08121/91 10.96 21.72 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 ND<0.3 - 11/26191 11.53 21.15 ND<34 99 ND<0.30 NN0.30 ND4,30 ND<0.30 - - - SEQ 02121/92 11.10 21.58 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 - - _ ... - SEQ 04107/92 33.18 11.41 21.77 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 SEQ 11.40 21.78 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 - - _ 072W9211.50 21.68 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - SEA 10121/92 11.61 21.57 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.6 _ - SEQ 01122!93 I J. 10.56 1 22.52 1 ND<50 I ND<50 I ND<0.5 ND<0.5 ND<0.5 LUDox - ND40 ND<2.0 ND<5.0 SEQ NOTES: ppb = parts par Wilton(µgm Top of casing elevations wars surveyed In reference b a ra&o&d spilm set to an it TPH-G - ictal petroleum hydrocarbons as gasoline Island on the approximale centerline of East Gmnfte Road 19.5 ket westkom the TPH-D a total petroleum hydrocarbons as diesel center!!na of the railroad spur trail m. ND = not dstecled at detection limits stated In of IcIal laboralory reports At!wells resurveyed an Apri17,1992,by Land tmprovemerrtgervicea.April 7 and 24, not meesuraotrnot analyzed/not applicable 1992,data relied resurveyed elevations. 2-HEX - 2-Hexon-1-of(E) a sample reported as not mats hIng typical gasonne pattem = sampled repodDd as not appearing to contain gasoMe AEL a American Environmental Laboratories,Inc. SAL Laboratories,Inc.Ea eq Page 1 of a 10.1360aw TAaLE 02 M4 r