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Table 3 Analytical Results for Groundwater-Volatile Organic Compounds-Chevron Service Station f19-6171,6633 Pacific Avenue,Stockton, California (continued) EXPLANATION ANALYTICAL LABORATORIES 1,2-DCA= 1,2-Dichloroethane APPL= Agriculture&Priority Pollutants Laboratories, [no of Fresno, California 1,1-DCA = 1,1-Diehloroethane SAL= Superior Analytical Laboratory of San Francisco,California TCE =Trichloroethene GTEL= Groundwater Technology Environmental Laboratories,Inc ,of Concord, California PCE = Tetrachloroethene SEQ = Sequoia Analytical Laboratories of Redwood City,California B = Benzene T = Toluene NOTES E = Ethylbenzene X = Xylenes 1 Well has been dry since December 15, 1989 sampling event VOCs = Volatile Organic Compounds = Chloroform detected at 1 4 ppb Other VOCs not detected at detection limns of 0 5 to 1 0 ppb ppb = Parts per billion ° Not detected at detection limits of 0 5 to 10 ppb ND = Not detected s Not detected at detection limits of 3 to 20 ppb ' BTEX concentrations included on Table 2 Other VOC's not detected at detection lirmts of 5 to 50 ppb ANALYTICAL METHODS s All other VOC's were non-detectable with detections limits ranging from 40 to 200 ppb ? All other VOC's were non-detectable with detection limits ranging from 100 to 700 ppb VOC = EPA Method 8240/EPA Method 624& • All other VOC's were non-detectable with detection harts ranging from 22 to 110 ppb EPA method 8260 ° Volatile Tentatively Identified Compounds not present at estimated detection Itmite of 100 ppb Positive identification or specification between isomers cannot be made without retention time standards 10 Volatile Tentatively Identified Compounds not present at estimated detection limits of 250 ppb Positive identification or specification between isomers cannot be made without retention time standards It 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 13 Split samples were taken by Levine-Fricke and analyzed by Quanterra Environmental Services of West Sacramento, for EPA Method 9260 13 Cts-1,2-Dichloroethene was detected at 1 6 ppb All other constituents were non-detectable 14 All other constituents were non-detectable is Cts-1,2-Dichloroethene was detected at 10 ppb All other constituents were non-detectable is Benzene and toluene were detected at 13 and 1 2 ppb, respectively All other constituents were non- detectable 17 Toluene was detected at 2 1 ppb All other constituents were non-detectable 5121VOC TQM 2