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Table 1. Water Level Data affil Cm irviwater Anal foal Results-Chevron Service Station#9-6171 6633 Pacific Avenue Stockton California continued EXM ANATIiN WEEMS (continued) TOC =Top of casing elevation ' Monitoring well abandoned on July 31, 1992 (ft) =Feet 2 EDB was also analyzed and not detected at detection limits of 0 2 ppb DW= Depth to water s TOG was also analyzed and not detected at detection Itnuts of 5,000 ppb GWE= Groundwater elevation • Gasoline range concentration reported Peaks not associated with gasoline arc mal -Measurements referenced relative to mean sea level observed early in the chromatogram TPH(G) = Total Purgeable Petroleum Hydrocarbons as Gasoline s Both gasoline and multiple solvent peaks were observed in the chromatogram B =Benzene 6 UncategonTcd conVound is not included in the gasoline hydrocarbon concentration T=Toluene t g Y Detection limit raised due to surfactants E= Ethylbenzene s Typical gasoline pattern not present Peak at 7 2 minutea subtracted from gasoline X -Xylenes range before calculating gasoline concentration EDB= Ethylene dibromide i Non-gasoline components which were not identified by the laboratory present in TOG=Total Oil and Grease sample at 150 ppb, 11/29/90 Non-gasoline components which were not identified VOC=Volatile Organic Compound by the laboratory present in sample at 300 ppb,3114191 MTBE= Methyl-tertiary-butyl-ether 10 Gasoline range concentration reported,peaks are representative of tetrachloroethane —=Not analyzed/not appticable and trace amount of gasoline ppb = Parts per billion " Gasoline range concentration reported The chromatogram shows only a single peak ANALYTICAL.iu>'runhc 12 Both gasoline and a single solvent peak (chlonnated) were observed in the chromatogram " Both gasoline and a single solvent peak are observed in the chromatogram TPH(G) = EPA Method 5030/8015 z, Detection linut raised due to foaming sample matrix BTEX&MTBE = EPA Method 602/EPA Method 8020 is TOC elevation for well MW-7 was surveyed by Ron Miller, Licensed Land NOTESSurveyor,PE#15816 on September 13, I993 10 Carryover from previous sample in run sequence made it necessary to analyze TOC elevations were surveyed by Ron Miller, Licensed Land Surveyor,CE#15$16 on ° backup sample Backup sample foamed,therefore,no data is available The sample was diluted due to high concentration of non-target compounds September 5, 1990 asHydrocarbons in the gasoline sample do not match the gasoline standard pattern Water level elevation data and laboratory analytical results prior to May 30, 1995,were to The sample was diluted due to high concentrations of non-target compoundsMTBE was also analyzed and not detected at detection limit of 2 5 ppb compiled from Ae Quaiiy Monitoring Reports prepared for Chevron by Sierra Environmental 20 Laboratory reported discrete peak C8-C9 Services 2i 22 Laboratory reported unidentified hydrocabron <C9• Product thickness was measured with an MMC flexr dip interface probe 23 Laboratory report indicates discrete peaks C7-C8 Laboratory report Indicates discrete peaks C6-C8 5121 TQM i i 7