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• i y Table 1 Water Level Data and Groundwater Analytical Results - Chevron Service Station #9-6171, 6633 Pacific Avenue, Stockton, California (continued) EXPLANATION NOTES (continued) DTW = Depth to water ' Monitoring well abandoned on July 31, 1992 TOC = Top of casing elevation ' EDB was also analyzed and not detected at detection limits of 0 2 ppb GWE = Groundwater elevation 3 TOG was also analyzed and not detected at detection limits of 5,000 ppb ms] = Measurements referenced relative to mean sea level 4 Gasoline range concentration reported Peaks not associated with gasoline are TPH(G) = Total Purgeable Petroleum Hydrocarbons as Gasoline observed early in the chromatogram B = Benzene ' Both gasoline and multiple solvent peaks were observed in the chromatogram T = Toluene 6 Uncategonzed compound is not included in the gasoline hydrocarbon concentration E = Ethylbenzene 7 Detection]nit raised due to surfactants X = Xylenes ' Typical gasoline pattern not present Peak at 7 2 minutes subtracted from gasoline EDB = Ethylene dibromide range before calculating gasoline concentration TOG = Total Oil and Grease ' Non-gasoline components which were not identified by the laboratory present in VOC = Volatile Organic Compound sample at 150 ppb, 11/29/90 Non-gasoline components which were not identified MTBE = Methyl-tertiary-butyl-ether by the laboratory present to sample at 300 ppb,3114191 — = Not analyzed/not applicable 10 Gasoline range concentration reported,peaks are representative of tetrachloroethane ppb = Parts per billion and trace amount of gasoline " Gasoline range concentration reported The chromatogram shows only a single peak ANALYTICAL METHODS 12 Both gasoline and a single solvent peak (chlorinated) were observed in the chromatogram TPH(G) = EPA Method 5030/8015 13 Both gasoline and a single solvent peak are observed in the chromatogram 13TEX&MTBE = EPA Method 602/EPA Method 8020 14 Detection limit raised due to foaming sample matrix 1s TOC elevation for well MW-7 was surveyed by Ron Miller, Licensed Land NOTES Surveyor, 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 on backup sample Backup sample foamed,therefore, no data is available 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 levet elevation data and laboratory analytical results prior to May 30, 1995 were it The sample was diluted due to high concentrations of non-target compounds compiled from Quarterly Monitoring Reports prepared for Chevron by Sierra Environmental 19 MTBE was also analyzed and not detected at detection limit of 2 5 ppb Services m Laboratory reported discrete peak C8-C9 71 Laboratory reported unidentified hydrocabron <C9 * Product thickness was measured with an MMC flexi-dip interface probe zx Laboratory report indicates discrete peaks C7-C8 r' Laboratory report indicates discrete peaks C6-C8 5121 TQM I 6