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Table 6 <br /> Historical Groundwater Analytical Results-Additional Oxygenate Compounds <br /> Chevron Facility#306620 <br /> (Former Unocal#5098) <br /> 5606 Pacific Avenue <br /> Stockton, California <br /> EXPLANATIONS: <br /> --=Not Analyzed 1,2,4-TMB= 1,2,4-Trimethylbenzene <br /> sec-BB=sec-Butylbenzene 1,3,5-TMB= 1,3,5-Trimethylbenzene <br /> EDB=Ethylene dibromide/1,2-Dibromoethane (µg2)=Micrograms per liter <br /> 1,2-DCA=1,2-Dichloroethane (D)=Duplicate <br /> IPB=Isopropylbenzene ND=Not Detected <br /> MTBE=Methyl Tertiary Butyl Ether NAPHT=Naphthalene <br /> n-PB=n-Propylbenzene J=Estimated Value <br /> For concentrations reported above laboratory reporting limits since August 5,2003,please refer to Table 7. <br /> 12-06-94 1,2-Dichloropropane was detected in well MW-1 (5.3 µg2). <br /> 02-08-95 1,2-Dichloropropane was detected in well MW-1 (1.3 µg2). <br /> 06-21-95 1,2-Dichloropropane was detected in wells MW-1 (1.6µg(L)and MW-4(1.3µg2); Methylene chloride was detected in wells MW-3(4.8µg2)and MW-4(2.4µg2). <br /> 12-19-95 Samples taken were analyzed outside of their holding time. <br /> 03-I1-96 Chloroform was detected in wells MW-1 (3.7µg2),MW-5(3.0µg2),and MW-6(1.3 µg(L). <br /> 06-19-96 1,2-Dichloropropane was detected in well MW-1 (1.2µg2). <br /> 12-05-96 Chloroform was detected in well MW-1 (2.6µg(L). <br /> 12-10-97 Chloroform was detected in wells MW-1 (1.6µg2)and MW-5(1.2µg(L). <br /> 09-16-98 1,2-Dichloropropane was detected in wells MW-1 (1.2µg2)and VEW-5(3.4µg2). <br /> 09-16-98 p-Isopropyltoluene was detected in wells MW-1 (1.5µg2),VEW-4(8.4µg2),and VEW-5(6.2µg2). <br /> 09-16-99 p-Isopropyltoluene was detected in well MW-2(1.1 µg2). <br /> 09-19-00 Tetrachloroethene was detected in well MW-18(1.4 pg/L);p-isopropyltoluene was detected in well MW-19D(1.1 µg2);Several wells contained methylene chloride,a <br /> laboratory contaminant. <br /> 12-13-00 Methylene chloride,a laboratory contaminant, was detected in well MW-13(25.0µg2); Several wells contained chloroform in low concentrations;The chloroform is <br /> believed to be derived from the tap water used to decontaminate the pump and hose system. <br /> 09-25-01 Tetrachloroethene was detected in wells MW-27(4.1 µg2)and MW-18(1.6µg2) p-Isopropyltoluene was detected in well MW-813 @ 45'(25 gg/kg). <br /> 09-22-02 Tertiary Butyl Alcohol was detected in wells MW-3(70µg2),MW-4(19µg2),MW-14A(5.6µg2),MW-25S(37µg2),and MW-25D(38µg2). Chloroform was <br /> detected in well MW-1 (3.0µg2)and Tetrachloroethene was detected in wells MW-18 (0.85µg2),MW-21S(0.58µg2),and MW-27(2.3µg2). <br /> 12-03-02 p-Isopropyholuene(19µg2)and Styrene(1.5µg2)were detected in well MW-11. Vinal chloride was detected in well MW-17(2.6µg2),Tetrachloroethene was <br /> detected in wells MW-18(0.92µg2),MW-23D(0.82µg2), Trichloroethene was detected in well MW-27(1.8µg2). <br /> 08-05-03 p-Isopropyltoluene was detected in wells MW-2(2.9µg2),MW-11 (3.8 gg/L)and MW-25D(0.62µg2). Styrene(1.0µg2) was detected in well MW-11. <br /> Wells MW-18(0.52 pg/L),MW-21S(0.65µg2)and MW-27(3.6µg2)also contained Tetrachloroethene. Well MW-27 contained Trichloroethene(0.98µg2). <br /> Received revised laboratory report on June 7,2007,updated tables to reflect new data. <br /> 2 Laboratory report indicates estimated value. <br /> 60146576 <br /> 51 of 51 <br /> AECOM <br />