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VMj 0 0 Table 3 Analytical Results for Groundwater-Volatile Organic Compounds-Chevron Service Station A9-6171,6633 Pacific Avenue,Stockton,California (continued) EXPLANATION ANALYTICAL LABORATORIES 1,2-DCA = 1,2-Dichloroethane APPL = Agriculture&Priority Pollutants Lsboratonea,Inc of Fresno,California 1,1-DCA = 1,1-11hehloroethane SAL= Superior Analytical Laboratory of San Francisco,California TCE - Trichloroethene GTEL = Groundwater Technology Environmental Laboratories,Inc,of Concord, California PCE =Teirachloroethene SEQ = Sequoia Analytical Laboratories of Redwood City,California B = Benzene T =Toluene NOTES E= Ethylbenzene X = Xylenes ' Well has been dry since December 15, 1989 sampling event VOCs = Volatile Organic Compounds 1 Chloroform detected at 14 pph Other VOCs not detected at detection limits of 0 5 to 10 ppb ppb = Parts per billion 3 Not detected at detection limits of 0 5 to 10 ppb ND = Not detected 4 Not detected at detection limits of 3 to 20 ppb BTEX concentrations n ntrations iiicludtd on Table 2 Other VOC's not detected at detection limits of 5 to SO ppb ANALYTICAL METHODS 6 All other VOC's were non-detectable with detections limits ranging from 40 to 200 ppb 7 All other VOC's were non-detectable with detection Imuts ranging from 100 to 700 ppb VOC = EPA Method 8240/EPA Method 624& s All other VOC's were non-detectable with detection limits ranging from 22 to 110 ppb EPA method 8260 9 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 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 tine standards 11 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 `= Split samples were taken by Levine-Fricke and analyzed by Quanterra Environmental Services of West Sacramento, for EPA Method 6260 33 Cis-1,2-Dichloroetherie was detected at 16 ppb All other constituents were non-detectable 14 All other constituents were non-detectable is Cis-1,2-Dichloroethene was detected at 10 ppb All other constituents were non-detectable 16 Benzene and toluene were detected at 13 and 12 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