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Table 3 Groundwater Analytical Results - Volatile Organic Compounds - Chevron Service Station #9-6171, 6633 Pacific Avenue, Stockton, CalI orma (continued) EXPLANATION ANALYTICAL LABORATORIES 1,2-DCA = 1,2-Dichloroethane APPL = Agnculture&Priority Pollutants Laboratories,Inc of Fresno,California I,l-DCA = i,l-Dichloroethane 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 Quanterra = Quanterra Environmental Services of West Sacramento,California T=Toluene E = Ethylbenzene NOTF..S X = Xylenes VOCs=Volatile Organic Compounds ` Well has been dry since December 15, 1989 sampling event ppb= Pani per billion ' Chloroform detected at 1 4 ppb Other VOCs not detected at detection lututs of 0 5 to 10 ppb ND = Not detected 3 Not detected at detection limits of 0 5 to 1 0 ppb ' Not detected at detection limits of 3 to 20 ppb ANAT.YTICAT METHOD S BTEX concentrations included on Table 2 Other VOC's not detected at detection linuts of 5 to 50 ppb 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 limits 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 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 1° 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 " Volatile Tentatively Identified Compounds not present at estimated detection lints of 56 ppb Positive identification or specification between isomers cannot be made without retention time standards L2 identification samples taken by Levine-Fncke-Recon,analyzed by Quanterra Environmental Services of West Sacramento Analytical results supplied by Levine-Fricke-Recon 13Cis-1,2-Dichloroethene was detected at 1 6 ppb All other constituents were non-detectable All other constituents were non-detectable 'S Cts-1,2-Dichloroethene was detected at 1 0 ppb All other constituents were non-detectable 16 Benzene and toluene were detected at 1 3 and 1 2 ppb, respectively All other constituents were non- detectable " Toluene was detected at 2 1 ppb All other constituents were non-detectable Cis-1,2-Dichloroethane was detected at 1 9 ppb Chloroform, 1,1,1-Trichloroethane,benzene,and toluene were detected at 1 7,7 6 l 6,and 1 1 ppb,respectively 'p Chloroform, 1,1,1-tnchloroethane, benzene, and toluene were detected at 3 3, 90, l 3, and 1 6 ppb, respectively 30 Cts-1,2-dlchloroethane and 1,1,1,2-tetrachloroethane were detected at 19 and 18 ppb,respectively 5121VOC TQM 2