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Table 1 Recent Groundwater Analytical Results Former Unocal Station No 5098 5400 and 5606 Pacific Avenue Stockton,California Sample ID Unit DTW TI'Hg 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 t J (up/L) (.g/LJ (u /L) (u /L) (u /L (u /L (u /L) (u /L) (u /L) o' /L) ("g/LJ (u /L (u /L) (u ),) (u /L) (u /L i MW-25S 12/23/03 A 3500 <50 <0 5 <0 5 <0 5 31 <0 5 <05 <0 5 1 2 062 <0 5 24 <05 <1 0 NA NA 02127/04 A 3405 <50 <0 50 <0 50 <0 50 66 <0 50 <0 50 058 <0 50 <0 50 <0 50 <0 50 <0 50 <1 0 NA NA 04112/04 A 3389 <50 <0 50 <0 50 <0 50 11 <0 50 <0 50 081 is <0 50 <0 50 <0 50 <0 50 <1 0 -- -- MW-25D 12/23/03 B 3565 680 <2 5 <2 5 <2 5 <2 5 140 32 <2 5 100 77 83 310 68 88 NA NA 02/27/04 B 3411 2000 11 55 37 <10 270 79 <10 310 170 13 590 150 140 NA NA 04112104 B 3410 1,800 <0 50 19 16 <0 50 110 30 <0 50 24 67 55 170 20 31 -- -- MW-27 12/18/03 B 3561 <50 <0 5 <0 5 <05 <0 5 <0 5 <05 <05 <0 5 <0 5 <0 5 <05 <0 5 <1 0 NA NA 02/27/04 B 3457 <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 NA NA 04112104 B 3440 <50 078 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 095 <0 50 22 — -- AS-26 12/23/03 B 3521 <50 <0 5 <0 5 <0 5 <0 5 <0 5 <0 5 <0 5 <0 5 <0 5 <05 <0 5 <0 5 <1 0 NA NA 02/27/04 B 3408 <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 NA NA 04112104 B 3409 <50 42 <0 50 <0 50 <0 50 054 <0 50 <0 50 <0 50 <0 50 051 087 <0 50 21 -- -- QA 04112104 -- <50 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 pg1L),MW-11 (3 8 pglL)and MW-25D(0 62 pg/L) Styrene(1 0 pglL) was detected in well MW-11 Wells MW-18(0 52 pglL),MW-21S(0 65 Vg/L)and MW-27(3 6 pg1L)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 =1,2,4-Tnmethylbenzene 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 =1,3,5-Tnmethylberrzene N-BUTYL =n-Butylbenzene TPHg =Total Petroleum Hydrocarbons as Gasoline I Although sample contains compounds in the rentention time range associated with gasoline,the chromatogram was not consistent with the expected chromatographic patter or fingerprint However,the reported concentration is based on gasoline 06940-293 Sof 5 ENSR Corporation