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Table 1 <br /> Groundwater Analytical Results <br /> Former Unocal Station No 5098 <br /> 5400 and 5606 Pacific Avenue <br /> Stockton,California <br /> Sample 10 Unit DTW TP14g BENZENE n-BUTYL sec-BB 1,24DCA EB IPB MTBE NAPHT "B TOLUENE 1,2,4-TMB 1,3,5-TMB XYLENES METHANOL ETHANOL <br /> 01) (U&E) u u a a u L u u u *IL) u a u (.L)( u u <br /> QA <br /> 04/12/04 — <60 — -- -- — -- -- -- -- — — -- -- -- -- -- <br /> 07/12/04 — <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <1 0 — — <br /> 10/18/04 — <1)0 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <1 0 — — <br /> 01110r05 — <60 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <1 0 -- — <br /> OW11105 <14 <0 50 <0 so <0 s0 <0 50 <0 so <0 80 <0 s0 <0 80 <0 80 <0 s0 <0 so <0 80 <1 0 — — <br /> NOTES <br /> Und=Hydrostrabgraphlc Unit in which the well is sereened <br /> Only compounds which were detected are shown on this table <br /> 08/05/03 =p-Isopropylloluene was detected in wells MW-2(2 9 pg/L),MW-11 1 (3 8 pg/L)and MW-25D(0 62 pglL) Styrene(1 0 pg1L) was detected in well MW-11 <br /> Wells MW-18(0 52 pg/L),MW-21S(0 65 pglL)and MW-27(3 6 Vg/L)also contained Tetrachloroethene Well MW-27 cordamed Tnchlomethene(0 98 Vg/L) <br /> NS =Not Sampled <br /> ug1L=Micrograms per t iter <br /> < =Not detected at or above concentration limit listed <br /> DTW=Depth to Water EB=Ethylbenzene N-PB =n-Propylbenzene NA=Not Analyzed <br /> 1 2,4-TMB=1 24-Tnmelhyi1Emzene IPB =Isopropyibenzens NAP14T=Naphthalene ND=Not Detected <br /> 1,2-DCA=1,2-Dichloroethane MTBE=Methyl Tertiary Butyl Ether sec-BB=sec-Butylbenzene NS =Not Sampled <br /> 1,3,5-TMB=1,35-Tnmethylbenzene N-BUTYL=n-Butylbenzene TPI-Ig =Total Petroleum Hydrocarbons as Gasoline <br /> 'Although sample cimtains compounds In the rentention time range associated with gasoline,the chromatogram was not consistent with the expected chromatographic pat <br /> fingerprint However,the reported concentration is based on gasoline <br /> 2 Samples collected on August 31 2004 following well development activities <br /> 'Sample reported a-a weathered gasoline <br /> Dfi9f6293 11 of 11 ENSR Coiporabon <br /> I <br />