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Table 1 Water Level Data and Groundwater Analytical Restdts-Chevron Service Station#9.6171, 6633 Pacific Avenue, Stockton, Califorma (continued) EXPLANAT1flN NOTE (continued) TOC = Top of casing elevation 10 Gasohne range concentration reported,peaks are representative of tetrachloroethane (ft) = Feet and trace amount of gasoline DTV = Depth to water Gasoline range concentration reported The chromatogram shows only a single peak OWE = Groundwater elevation Both gasoline and a single solvent peak (chlorinated) were observed in the msl = Measurements refererced relative to mean sea level chromatogram TPH(G) = Total Purgeable Petroleum Hydrocarbons as Gasoline 13 Both gasoline and a single solvent peak are observed in the chromatogram B = Benzene 14 Detection limit raised due to foaming sample matnx T = Toluene 15 TOC elevation for well MW-7 was surveyed by Ron Miller, Licensed Land E = Ethylbenzene Surveyor,PE#15816 on September 13 1993 X = Xylenes 16 Carryover from previous sample in run sequence made it necessary to analyze EDB = Ethylene dibromide backup sample Backup sample foamed, therefore no data is available TOG = Total Ott and Grease " The sample was diluted due to high concentration of non target compounds VOC = Volatile Organic Compound Hydrocarbons in the gasoline sample do not match the gasoline standard pattern MTBE = Methyl tertiary butyl ether 1° The sample was diluted due to high concentrations of non-target compounds --- = Not analyzed/not applicable y MTBE was also analyzed and not detected at detection limit of 2 5 ppb ppb = Parts per billion '6 Laboratory reported discrete peak C8-C9 Laboratory reported unidentified hydrocabron <C9 NOTES Laboratory report indicates discrete peaks C7-C8 Laboratory report indicates discrete peaks C6-C8 TOC elevations were surveyed by Ron Miller, Licensed Land Surveyor, CE #15816 on a Laboratory report indicates unidentified hydrocarbons C6-C12,discrete peaks C6 September 5, 1990 3 MTBE by EPA Method 8260 6 Split sample taken by Levine-Fricke Recon,analyzed by Quanterra Environmental Water level elevation data and laboratory analytical results prior to May 30 1995, were Services of West Sacramento Analytical result supplied by Levine-Fncke-Recon compiled from Quarterly Monitoring Reports prepared for Chevron by Sierra Environmental Laboratory report indicates unknown hydrocarbons detected at 3 000 ppb See Services specific analytical results for further explanation '' Split sample taken by Levine-Fricke-Recon,analyzed by Quanterra Environmental Field parameters and analytical data for 8/13/96 and 11/11/96 may be found in the Services of West Sacramento Analytical result supplied by Levine-Fricke Recon respective quarterly luonitonng reports for the specific events Laboratory report indicates unknown hydrocarbons detected at 170 ppb See specific analytical results for further explanation i Product thickness was measured with an MMC flexi-dip interface probe ° Split sample taken by Levine-Fricke-Recon analyzed by Quanterra Environmental Services of West Sacramento Analytical result supplied by Levine Fricke-Recon Monitoring well abandoned on July 31 1992 Laboratory report indicates t nknown hydrocarbons detected at 530 ppb See specific ' EDE was also analyzed and not detected at detection limits of 0 2 ppb aralytical results for further explanation i TOG was also analyzed and not detected at detection limits of 5,000 ppb '9 Split sample taken by Levine Fricke Recon,analyzed by Quanterra Environmental ` Gasoline range concentration reported Peaks not associated with gasoline are Services of West Sacramento Analytical result supplied by Levine-Fncke-Recon observed ea-ly in the chromatogram Laboratory report indicates unknown hydrocarbons detected at 98 ppb See specific 5 Both gasoline and multiple solvent peaks were observed in the chromatogram analytical results for further explanation ° Uncategorized compourA is not included in the gasoline hydrocarbon concentration w Split sample taken by Levine-Fricke Recon analyzed by Quanterra Environmental ' Detection Imut raised due to surfactants Services of West Sacramento Analytical result supplied by Levine-Fricke-Recon e Typical gasoline pattern not present Peak at 7 2 minutes subtracted from gasoline See specific analytical results for further explanation range before calculating gasoline concentration 9 Non gasoline components which were not identified by the laboratory present in sample at 150 ppb, 11/29/90 Non-gasoline components which were not identified by the laboratory present in sample at 300 ppb,3114191 5121 TQM 7