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Table 1 Water Level Data and Groundwater Analytical Results - Chevron Service Station #9-6171, 6633 Pacific Avenue, Stockton, California (continued) EXPLANATION NOTES (continued) TOC =Top of casing elevation i Monitoring well abandoned on July 31, 1992 (fl) = Feet 2 EDB was also analyzed and not detected at detection limits of 0 2 ppb DTW= Depth to water 3 TOG was also analyzed and not detected at detection limits of 5,000 ppb GWE = Groundwater elevation 6 Gasoline range concentration reported Peaks not associated with gasoline are mal = Measurements referenced relative to mean sea level observed early in the chromatogram TPH(G) = Total Purgeable Petroleum Hydrocarbons as Gasoline a Both gasoline and multiple solvent peaks were observed in the chromatogram B = Benzene 6 Uncategonzed compound is not included in the gasoline hydrocarbon concentration T =Toluene 7 Detection limit raised due to surfactants E= Ethylbenzene 6 Typical gasoline pattern not present Peak at 7 2 minutes subtracted from gasoline X =Xylenes range before calculating gasoline concentration EDB — Ethylene dibromide 0 Non-gasoline components which were not identified by the laboratory present in TOG =TotaI Oil and Grease sample at 150 ppb, 11/29/90 !Yon-gasoline components which were not identified VOC =Volatile Organic Compound by the laboratory present in sample at 300 ppb,3114/91 MTBE = Methyl-tertiary-butyl-ether 10 Gasoline range concentration reported,peaks arse representative of tetrachloroethane --- = Not analyzed/not applicable and trace amount of gasoline ppb = Parts per billion I Gasoline range concentration reported The chromatogram shows only a single peak 12 Both gasoline and a single solvent peak (chlorinated) were observed in the ANALYTICAL METHODS chromatogram " Both gasoline and a single solvent peak are observed in the chromatogram TPH(G) = EPA Method 5030/8015 14 Detection linut raised due to foaming sample matrix BTEX&MTBE = EPA Method 602/EPA Method 8020 rs TOC elevation for well MW-7 was surveyed by Ron Miller, Licensed Land Surveyor,PE x'15816 on September 13, 1993 NOTES 16 Carryover from previous sample in run sequence made it necessary to analyze backup sample Backup sample foamed,therefore,no data is available TOC elevations were surveyed by Ron Miller, Licensed Land Surveyor, CE#15816 on 17 The sample was diluted due to high concentration of non-target compounds September 5, 1990 Hydrocarbons in the gasoline sample do not match the gasoline standard pattern is The sample was diluted due to high concentrations of non-target compounds Water level elevation data and laboratory analytical results prior to May 30, 1995,were 19 MTBE was also analyzed and not detected at detection lint of 2 5 ppb compiled from Quarterly Momtonng Reports prepared forChevronby Sierra Environmental 70 Laboratory reported discrete peak C8-C9 Services =' Laboratory reported unidentified hydrocabron <C9 U Laboratory report indicates discrete peaks C7-C8 0 Product thickness was measured with an MMC flexr-dip interface probe xs Laboratory report indicates discrete peaks C6-C8 5121 TQM 7