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Table 1 Groundwater Analytical Results Former Unocal Station No 5098 5400 and 5606 Pacific Avenue Stockton,California Sample ID Unit DTW TPHg BENZENE n-BUTYL sec-BB 1,2-DCA EB IPB MTBE NAPHT N-PB TOLUENE 1,2,4-TMB 1,3,5-TMB XYLENES METHANOL ETHANOL (u/L) (u /L) (u/L) (ug/l-) (.g/LJ (u /L (u /L) (u L) *IL) (u L (u/L) (u/L) (u/L) (u L (1191L) (u/L) QA 04/12/04 - <50 -- -- -- — -- — -- — -- -- — -- -- 07/12/04 -- <50 <050 <050 <0 50 <0 50 <0 50 <050 <0 50 <0 50 <050 <050 <0 50 <050 <1 0 - - 10/18/04 - <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <050 <0 50 <0 50 <1 0 — — 01110l05 - <50 <0 50 <050 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <1 0 -- - NOTES Unit =Hydrostratigraphic Unit in which the well is sereened Only compounds which were detected are shown on this table 08/05/03 =p-Isopropyltoluene was detected in wells MW-2(2 9 pg/L), MW-11 (3 8 pglL)and MW-25D(0 62 pg/L) Styrene(1 0 pg/L) was detected in well MW-11 Wells MW-18(0 52 pg/L),MW-21S(0 65 pg/L)and MW-27(3 6 pg/L)also contained Tetrachloroethene Well MW-27 contained Trichloroethene(0 98 pg/L) NS = Not Sampled ug/L =Micrograms per Liter < =Not detected at or above concentration limit listed DTW =Depth to Water EB = Ethylbenzene N-PB =n-Propylbenzene NA =Not Analyzed 1,2,4-TMB =1 24-Trimethylbenzene IPB = Isopropylbenzene NAPHT =Naphthalene ND =Not Detected 1 2-DCA = 1,2-Dichloroethane MTBE =Methyl Tertiary Butyl Ether sec-BB =sec-Butylbenzene NS =Not Sampled 1 3 5-TMB = 1 35-Trimethylbenzene N-BUTYL =n-Butylbenzene TPHg =Total Petroleum Hydrocarbons as Gasoline t Although sample contains compounds in the rentention time range associated with gasoline the chromatogram was not consistent with the expected chromatographic patty fingerprint However,the reported concentration is based on gasoline Z Samples collected on August 31 2004 following well development activities 06940 293 11 of 11 ENSR Corporation