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r r rr r r r r ■r� r� Si■� r� s 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 12-19-135 were analyzed outside of their holding time 12-06-94 1,2-Dichloropropane was detected to well MW-1 (5 3 pg/L) 02-08-95 1,2-Dtchloropropane was detected to well MW-1 (1 3 pg/L) 06-21-95 1,2-Dichloropropane was detected to wells MW-1 (1 6 pg/L)and MW-4(1 3 pg/L), Methylene chloride was detected to wells MW-3(4 8 pg/L) and MW-4(2 4 pg/I-) 03-11-96 Chloroform was defected to 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-Dtchloropropane was detected to well MW-1 (1 2 pg/L) 12-05-96 Chloroform was detected in well MW-1 (2 6 pg/L) 12-10-97 Chloroform was detected to wells MW-1 (1 6 pg/L)and MW-5(1 2 pg/L) 09-16-98 1,2-Dtchloropropane was detected in wells MW-1 (1 2 pg/L)and VEW-5(3 4 pg/L) 09-16-98 p-Isopropyltoluene was detected to wells MWA (1 5 pg/L),VEW-4(8 4 pg1L), and VEW-5(6 2 pg/L) 09-16-99 p-Isopropyltoluene was detected to well MW-2(1 1 pg1L) 09/19/00 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 chlonde, a laboratory contaminant, was detected to well MW-13(25 0 pg/L), Several wells contained chloroform to 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 defected in wells MW-27(4 1 pg/L)and MW-18(1 6 pg/L) p-Isopropyltoluene was detected in well MW-81)@ 45'(25 pglkg) 09/22/02 Tertiary Butyl Alcohol was detected to 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 pg/L) Chloroform was detected to well MW-1 (3 0 pg/L)and Tetrachloroethene was detected to wells MW-18 (0 85 pg/L), MW-21 S(0 58 pg/L), and MW-27(2 3 pg/L) 12/03/02 p-Isopropyltoluene(19pg/L)and Styrene(1 5 pg/L)were detected to well MWA 1 Venal chloride was detected to 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 to well MW-27 (1 8 pg/L) < = Not detected at or above concentration limit listed NA = Not Analyzed 1,2,4-TMB = 1,2,4-Trimethylbenzene N-PB =n-Propylbenzene 1,2-DCA = 1,2-Dtchloroethane 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 TPHg =Total Petroleum Hydrocarbons as Gasoline N-BUTYL =n-Butylbenzene N 1232 ANALYTICAL-DATA 06940-293 29 of 29 ENSR Corporation