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�I Table 3 Historical Groundwater Analytical Results Former Unocal Station No 509$ 5400 and 5606 Pacific Avenue Stockton,California 1 � EXPLANATION r Only compounds which were detected are shown on this table' (1 )Samples takers on 12-19-95 were analyzed outside of thei ,holding time 12-06-94 1,2-Dichloropropane was detected inpell MW-1 (5 3 pg/L) 02-08-95 1,2'Dichloropropane was detected tn,well MW-i1 (1 3 pg/L) 06-21-95 1,2'Dichloropropane was detected tn,wells MW-1 (11'6 pg/L)and MW-4(1 3 pg/L), Methylene chloride was detected to wells MW-3(4 8 Pg/L) and MW4(2 4 pg/L) 1 i; 11 �! 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-Dtchloropropane was detected in well MW-1 (1 2 pg/L) 12-05-96 Chloroform was detected to well MW-1 (2 6 pg/L) 1 11 12-10-97 Chloroform was detected to wells MWA (1 6 pg/L)and MW-5(1 2 pg/L) 09-16-98 1,2 Pichloropropane was detected to wells MW-1 (11'2 pg/L)and VEW-5(3 4 pg/L) 09-16-98 p4sopropyltoluene was detected in wells MW-1 (1 51'pg/L)1,VEW-4(8 4 pg/L),and VIEW-5(6 2 pg/L) 09-16-99 p-Isopropyltoluene was detected in wail MW-2�1 1 Ng1L) 09/19/00 Tetrachloroethene was detected in well MW-18(1 4'Ng/L),� p-isopropyltoluene was detected in well MW-19D(1 1 pg/L), Several wells contained methylene chlonde,a laboratory contaminant 12/13100 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 denved from the tap water used to decontaminate the pump and hose system 09/25/01 Tetrachloroethene was detected in wells MW-27(4 1 pg/L)and MW-18(1 6 pg/L) p4sopropyltoluene was detected in well MW-8D @ 45'(251pglkg) 09/22/02 Tertiary Butyl Alcohol was detected m wells MW-3(76 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 in well MW-1 (3 0 pg1L)and Tetrachloroethene was detected In wells MW-18 (0 85 pg/L), MW-21 S(0 58 pg/L), and MW-27(2 3 pg1L) I l 12/03102 p4sopropyltoluene(19pg/L)and Styrene(1 5 Vg/L)were detected in well MW-11 Vinal chloride was detected in well MW-17(2 6 0g1L);I Tetrachloroethene was detected to 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-Tnmethylbenzene j' n-PB =n-Propylbenzene 1,2-DCA = 1,2-Dichloroethane f NA =Not Analyzed/Not Accessible 1,3,5-TMB = 1,3,5-Tnmethylbenzene NAPHT =Naphthalene DTW = Depth to Water 4 ND = Not Detected EB =Ethylbenzene NS = Not Sampled IPB =Isopropyl benzene sec-BB =sec-Butylbenzene MtBE = Methyl Tertiary Butyl Ether TPHg =Total Petroleum Hydrocarbons as Gasoline N-BUTYL =n-Butyltsenzene i N 1232 ANALYTICAL-DATA I � 06940-0 * ENS10oration