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Table 3 ' Historical Groundwater Analytical Results Former Unocal Station No 5098 5400 and 5606 Pacific Avenue I' Stockton, California EXPLANATION i Only compounds which were detected are shown on this table (1 )Samples taken on 12-19-95 were analyzed outside of their holding time 12-06-94 1,2-Dichloropropane was detected in well MW-1 (5 3"pg/L)�I 02-08-95 1,2-Dichloropropane was detected;n well MW-1 (1 3'ug )f 06-21-95 1,2-Dichloropropane was detected in wells MWA (1 6 pg/L)and MW-4(1 3 pg/L), Methylene chloride was detected in wells MW-3(4 8 pWL) and MW-4(2 4 pg/L) l 1 II I 03-11-96 Chloroform was detected in wells MWA (3 7 pg/L),MW-5(3 0 pg/L),and MW-6(1 3 pg/L) k 06-19-96 1,2-Dichloropropane was detected in well MW-1'(12 ipg/L) 12-05-96 Chloroform was detected in well MW-1 (2 6 pg/L) 11 1� 12-10-97 Chloroform was detected in wells MW-1 (1 6 pg/L)and MW-5(1 2 pg/L) 09-16-98 1,2-Dichloropropane was detected in wells MW-'1 (1 2 pg/Lj and VEW-5(3 4 pg/L) 09-16-98 p-Isopropyltoluene was detected in wells MW-1 (1 5 pg/L),VEW-4(8 4 pg/L),and VEW-5(6 2 pg/L) 09-16-99 p-Isopropyltoluene was detected in well MW-2(1 1 pglL) 09/19100 Tetrachloroethene was detected in well MW-18(1 4 pg/L), p-isopropyltoluene was detected in well MW-191)(1 1 pg/L), Several wells contained methylene chloride,a laboratory contaminant 1 12/13/00 Methylene chloride,a laboratory contaminant, was detected in well MW-13(25 0 pg/L), Several wells contained chloroform in low concentrations,The chloroform is believed to be derived from the tap water used to decontaminate the pump and hose system 09/25/01 Tetrachloroethene was detected in wells MW-27(4 I j'pg/L)and MW-18(1 6 pg/L) I p4sopropyltoluene was detected in well MW-86@ 45'(25 pg/kg) 09/2?J02 Tertiary Butyl Alcohol was detected;n wells MW i3(70 pg/L), MW-4(19 pg/L), MW-14A(5 6 pg/L), MW-25S(37 pg/L),and MW-25D(38 pg/L) Chloroform was detected in well MW-1 (3 0 p9,L),andTetra kclhloroethene was detected;n wells MW-18 (0 85 pg/L), MW 21 S(0 58 pg/L), W- and MW-27(2 3 pg/L) i I f1 1 12/03/02 iso ro ltoluene 19 Styrene( pglL) p- p py ( pg1L)and S rene 1 5 were detected in well MW-11 Venal chloride was detected in well MWA 7(2 6 iJiw,�jTetra6loroethene was detected ;n wells MW-18(0 92 pg/L), MW-23D(0 82 pg/L), Trichloroethene was detected in well MW-27(1 8 pg/L) < =Not detected at or above concentration hmd:listed NA =Not Analyzed i I 1,2,4-TMB = 1,2,4-Tnmethylbenzene i4 n-PB =n-Propylbenzene L ' 1,2-DCA =1,2-Dichloroethane �j NA =Not Analyzed/Not Accessible 1,3,5-TMB =1,3,5-Tnmethylbenzene NAPHT =Naphthalene DTW =Depth to Water ND =Not Detected EB =Ethylbenzene NS =Not Sampled IPB =Isopropylbenzene sec-BB =sec-Butylbenzene MTBE =Methyl Tertiary Butyl Ether I TPHg =Total Petroleum Hydrocarbons as Gasoline N-BUTYL =n-Butylbenzene N 1232 ANALYTICAL-DATA r 06940-0 3�4 ENSWrabon � � � l� � A I� I�� Ili r � I• � I• tt• �