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i Sam i i i i i i 4r i Table 1 Recent Groundwater Analytical Results Former Unocal Station No 5098 5400 and 5606 Pacific Avenue, Stockton Sample ID Unit DTW TPH-G BENZENE sec-BB N-BUTYL 1,2-DCA EB IPB MTBE NAPHT N-PB TOLUENE 1,2,4-TMB 1,3,5-TMB XYLENES METHANOL ETHANOL N9/L)( (4 91) (Ug/L} (gg4) (Ug/L (u /L) (Ug/L u /L) (Ug/L (u /L) u /L) N91) (u /L) (u /L (u /L) N91)-- MW-27 u 1MW-27 08/05/03 B 3552 <50 <0 5 <0 5 <0 5 <0 5 <05 <0 5 <0 5 <1 0 <0 5 <0 5 <0 5 <0 5 <0 5 NA NA 12/18/03 B 3561 <50 <05 <0 5 <05 <0 5 <05 <0 5 <0 5 <0 5 <0 5 <0 5 <0 5 <0 5 <1 0 NA NA NOTES Unit =Hydrostratigraphic Unit in which the well is sereened Only compounds which were detected are shown on this table 815/2003 p-Isopropyltoluene was detected in yells MW-2(2 9 pg/L),MW-11 (3 8 pg/L)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 < =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-Tnmethylbenzene N-BUTYL =n-Butylbenzene TPH-G =Total Petroleum Hydrocarbons as Gasoline 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 5 ENSR Corporation