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i r ■ter r� � �■■� � r■■� t. � �i • i Table 3 Historical Groundwater Analytical Results Former Unocal Station No 5098 5400 and 5606 Pacific Avenue Stockton, California EXPLANATION 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) 02-08-95 1,2-Dichloropropane was detected in well MW-1 (1 3 pg1L) 06-21-95 1,2-Dichloropropane was detected in wells MW-1 (1 6 pg/L)and MW-4(1 3 pg/L), Methylene chloride was detected in wells MW-3(4 8 pg/L) and MW-4(2 4 pg/L) 03-11-96 Chloroform was detected in wells MW-1 (3 7 pg/L), MW-5(3 0 pg/L), and MW-6(1 3 pg/L) 06-19-96 1,2-Dichloropropane was detected in well MW-1 (1 2 pg/L) 12-05-96 Chloroform was detected in well MWA (2 6 pg/L) 12-10-97 Chloroform was detected in wells MW-1 (1 6 pg/L)and MW-5(1 2 pg1L) 09-16-98 1,2-Dichloropropane was detected in wells MW-1 (1 2 pg/L) 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-Isopropylteluene was detected in well MW-2(1 1 pg1L) 09/19100 Tetrachloroethene was detected in well MW-18(1 4 pg/L), p-isopropyltoluene was detected in well MW-19D(1 1 pg/L), Several wells contained methylene chloride, a laboratory contaminant 12/13/00 Methylene chloride, 3 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 1 pg1L)and MW-18 (1 6 pg1L) p-Isopropyltoluene was detected in well MW-8D @ 45'(25 pg/kg) 09122/02 Tertiary Butyl Alcohol was detected in wells MW-3(70 pg/L), MW4 (19 pg/L), MW-14A(5 6 pg/L), MW-25S(37 pg/L),and MW-25D (38 pg1L) Chloroform was detected in well MW-1 (3 0 pg/L)and Tetrachloroethene was detected in wells MW-18 (0 85 pg1L), MW-21S (0 58 pg/L), and MW-27(2 3 pg/L) 12/03/02 p4sopropyltoluene(19pg/L)and Styrene(1 5 pg/L)were detected in well MWA 1 Vinal chloride was detected in well MW-17(2 6 pg/L), Tetrachloroethene was detected in wells MW-18 (0 92 pg/L), MW-23D(0 82 pg/L), Trichloroethene was detected in well MW-27(1 8 pg1L) < = Not detected at or above concentration limit listed NA = Not Analyzed 1,2,4-TMB = 1,2,4-Tri methyl benzene n-PB =n-Propylbenzene 1,2-DCA = 1,2-Dichloroethane NA = Not Analyzed/Not Accessible 1,3,5-TMB = 1,3,5-Trimelhylbenzene 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 TPHg =Total Petroleum Hydrocarbons as Gasoline N-BUTYL = n-Butylbenzene N 1232 ANALYTICAL-DATA 06940 293 33 of 33 ENSR Corporation