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i Table 1 Water Level Data and Groundwater Analytical Results - Chevron Service Station !/9-6171, 6633 Pacific Avenue, Stockton, California (continued) EXPLANATION NOTES (continued) ' Monitoring well abandoned on July 31, 1992 DIV = Depth to water = TOC =Top of casing elevation EDB was also analyzed and not detected at detection limits of 0 2 ppb = ' TOG was also analyzed and not detected at detection limits of 5,000 ppb GWE Groundwater elevation mal =Measurements referenced relative to mean sea level + TPH(G) = Total Purgeable Petroleum Hydrocarbons as Gasoline Gasoline range concentration repotted Peaks not associated with gasoline are B Benzene observed early in the chromatogram ' Both gasoline and multiple solvent peaks were observed in the chromatogram T = Toluene s E = Ethylbenzene Uncategorized compound is not Included m a the gasoline hydrocarbon X =Xylenes concentration EDS = Ethylene dibromide ' Detection limit raised due to surfactants ' Typical gasoline pattern not present Peak at 7 2 minutes subtracted from TOG = Total oil and Grease VOC = Volatile Organic Compound gasoline range before calculating gasoline concentration bi ' on-gasoline components which were not identified by the laboratory present in MTBE=Methyl t-Butyl Ether — = Not analyzed/not applicable sample at 150 ppb, 11/29/90 Non-gasoline components which were not ppb = Parts per a billion Identified by the laboratory present in sample at 300 ppb,3114191 10 Gasoline range concentration repotted, peaks are representative of ANALYTICAL METHODS tetrachloroethane and trace artlount of gasoline " Gasoline range concentration repotted The chromatogram shows only a single TPH(G) = EPA Method 5030/8015 peak BTF.X = EPA Method 602/EPA Method 8020 " Both gasoline and a single solvent peak (chlorinated) were observed in the EDB = EPA Method 504 chromatogram TOG = Standard Method 503E " Both gasoline and a single solvent peak are observed in the chromatogram VOC = EPA Method 8240 " Detection limit raised due to foaming sample matrix " TOC elevation for well MW-7 was surveyed by Ron Miller,Licensed Land NOTESSurveyor,PE#15816 on September 13, 1993 16 Carryover from previous sample in run sequence made it necessary to analyze TOC elevations were surveyed by Ron Miller,Licensed Land Surveyor,CE#15816 backup sample Backup sample foamed,therefore,no date is available on September 5, 1990 " The sample was diluted due to high concentration of non-target compounds Hydrocarbons in the gasoline sample do not match the gasoline standard pattern Water level elevation data and laboratory analytic results prior to May 30,1995 were " The sample was diluted due to high concentrations of non-target compounds compiled from Quarterly Monitoring Reports prepared for Chevron by Sierra '1' MTBE was also analyzed and not detected at detection limit of 2 5 ppb Environmental Services Laboratory reported discrete peak C8-C9 21 Laboratory repotted unidentified hydrocabron <C9 • Product thickness was measured with an MMC flex,-dip interface probe 5121 TQM