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Table 3 Groundwater Analytical Results - Volatile Organic Compounds - Chevron Service Station #9-6171, 6633 Pacific Avenue, Stockton, California continued EXPi.ANA33ON ANALYTICAL LABORATORIES 1,2-DCA= 1,2-Dichloroethane APPL=Agriculture&Priority Pollutants Laboratories,Inc of Fresno,California 1,l-DCA= 1,1-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 = Quantetrn Environmental Services of West Sacramento,California T=Toluene E= Ethylbenzene NATES X =Xylenes VOCs =Volatile Organic Compounds s Well has been dry since December 15, I989 sampling event ppb = Parts per billion 2 Chloroform detected at 14 ppb Other VOCs not detected at detection limits of 0 5 to 10 ppb ND =Not detected s Not detected at detection limits of 0 5 to 10 ppb ` Not detected at detection limits of 3 to 20 ppb ANAI.YTT AL MFf HOD-q 3 BTEX concentrations included on Table 2 Other VOC's not detected at detection limas of 5 to 50 ppb f All other VOC's were non-detectable with detections limits ranging from 40 to 200 ppb VOC= EPA Method 8240/EPA Method 624& 7 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 I10 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 fD 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 limits of 56 ppb Positive identification or specification between isomers cannot be made without retention time standards ss Split samples taken by Levine-Fncke-Recon,analyzed by Quanterra Environmental Services of West Sacramento Analytical results supplied by Levme-Fricke-Recon is Cts-1,2-Dichloroethene 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 1 0 ppb All other constituents were non-detectable s` 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 i9 Cis-1,2-Dichloroethane was detected at 19 ppb Chloroform, 1,1,1-Trichloroethane,benzene,and toluene were detected at 17,7 6, 16,and 1 1 ppb,respectively 1° Chloroform, 1,1,1-trichloroethane, benzene, and toluene were detected at 3 3, 9 0, 13, and 16 ppb, respectively Cis-1,2-dichloroethane and 1,1,1,2-tetrachloroethane were detected at 19 and I 8 ppb,respectively 5121VOC TQM 2