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• • i Table 3 Analytical Results for Groundwater-Volatile Organic Compounds -Chevron Service Station/19-6171, 6633 Pacific Avenue, Stockton, California contmued EXPLANATION ANALYTICAL LABORATORIES 1,2-DCA= 1,2-DLchloroethane APPL= Agriculture&Priority Pollutants Laboratories,Inc of Fresno,Cahforma 1,1-DCA = 1,1-Dichloroethane SAL= Superior Analytical Laboratory of San Francisco,California TCE =Tnchloroethene GTEL= Groundwater Technology Environmental Laboratories,Inc,of Concord, California PCE=Tetrachloroethene SEQ = Sequoia Analytical Laboratories of Redwood City,California B = Benzene Quanterra = Quanterra Environmental Services of West Sacramento,California T =Toluene E= Ethylbenzene N(YrF-4 X =xylenes VOCs = Volatile Organic Compounds ' Well has been dry since December 15, 1989 sampling event ppb = Pants per billion 2 Chloroform detected at 1 4 ppb Other VOCs not detected at detection limits of 0 5 to 10 ppb ND = Not detected i Not detected at detection limits of 0 5 to 10 ppb ` Not detected at detection limits of 3 to 20 ppb ANALY77CAL MFPN(1T)S ' BTEX concentrations included on Table 2 Other VOC's not detected at detection limits of 5 to 50 ppb 6 All other VOC's were non-detectable with detections limits ranging from 40 to 200 ppb VOC = EPA Method 8240/EPA Method 624& ' All other VOC s were non-detectable with detection lunmts ranging from 100 to 700 ppb EPA method 8260 ' All other VOC's were non-detectable with detection limits ranging from 22 to 110 ppb ' Volatile Tentatively Identified Compounds not present at estimated detection limits of 100 ppb Positive identification or specification between isomers cannot be made without retention time standards `0 Volatile Tentatively Identified Compounds not present at estimated detection linuts of 250 ppb Positive identification or specification between isomers cannot be made without retention time standards LL Volatile Tentatively Identified Compounds not present at estimated detection limits of 56 ppb Positive identification or specification between isomers cannot be made without retention time standards L2 Split samples were taken by Levine-Fricke and analyzed by Quanterra Environmental Services of West Sacramento, for EPA Method 8260 `i Cis-1,2-Dichloroethene was detected at 16 ppb All other constituents were non-detectable All other constituents were non-detectable Cis-1,2-Dichloroelhene was detected at 10 ppb All other constituents were non-detectable Benzene and toluene were detected at 13 and 12 ppb, respectively All other constituents were non- detectable " Toluene was detected at 2 1 ppb All other constituents were non-detectable is Cis-1,2-Dichloroethane was detected at 19 ppb Chloroform, 1,1,1-Tnchlomethane,benzene,and toluene were detected at 1 7,7 6, 16,and 1 1 ppb,respectively Chloroform, 1,1,1-trichloroethane, benzene, and toluene were detected at 3 3, 9 0, 13, and 1 6 ppb, respectively 70 Cts-1,2-dichloroethane and 1,1,1,2-tetrachloroethane were detected at 1 9 and l 8 ppb,respectively 5121VOC 7QM 2