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Table l Water Level Data and Grotuldwater Analy-ucal Results-Chevron Service Station#i9-6171, 6633 Pacific Avenue, Stockton, Califorma(continued) EXPLANATION NOTFS (continued) TOC =Top of casing elevation i0 Gasoline range concentration reported, peaks are representative of tetrachloroethane (ft)= Feet and trace amount of gasoline DTW= Depth to water " Gasoline range concentration repotted The chromatogram shows only a single peak GWE = Groundwater elevation " Both gasoline and a single solvent peak (chlorinated) were observed in the msl = Measurements referenced 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 " Detection limit raised due to foaming sample matrix 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 " Carryover from previous sample in run sequence trade it necessary to analyze EDB = Ethylene dibromide backup sample Backup sample foamed,therefore,no data is available TOG = Total Oil 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 is The sample was diluted due to high concentrations of non-target compounds --- = Not analyzed/not applicable 19 MTBE was also analyzed and not detected at detection limit of 2 5 ppb ppb= Parts per billion w Laboratory reported discrete peak C8-C9 31 Laboratory reported unidentified hydrocabron <C9 NCITES n Laboratory report indicates discrete peaks C7-C8 u Laboratory report indicates discrete peaks C6-C8 TOC elevations were surveyed by Ron Miller Licensed Land Surveyor, CE#15816 on u Laboratory report indicates unidentified hydrocarbons C6-C12,discrete peaks C6 September 5, 1990 is MTBE by EPA Method 8260 i` 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-Fricke-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-Fncke-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 monitoring reports for the specific events Laboratory report indicates unknown hydrocarbons detected at 170 ppb See specific analytical results for further explanation * Product thickness was measured with an MMC flexr-dip interface probe 21 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 3l, 1992 Laboratory report indicates unknown hydrocarbons detected at 530 ppb See specific 2 EDB was also analyzed and not detected at detection limits of 0 2 ppb analytical results for further explanation TOG was also analyzed and not detected at detection limits of 5,000 ppb i9 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-Fricke-Recon observed early in the chromatogram Laboratory report indicates unknown hydrocarbons detected at 98 ppb See specific s Both gasoline and multiple solvent peaks were observed in the chromatogram analytical results for further explanation ` Uncategorized compound is not included in the gasoline hydrocarbon concentration 30 Split sample taken by Levine-Fncke-Recon,analyzed by Quanterra Environmental ' Detection limit raised due to surfactants Services of West Sacramento Analytical result supplied by Levine-Fricke-Recon ' Typical gasoline pattern not present Peak at 7 2 tntnutes subtracted from gasoline See specific analytical results for further explanation range before calculating gasoline concentration 31 Laboratory report indicates unidentified hydrocarbons C6-C12 9 Non-gasolme components which were not identified by the laboratory present in 32 Laboratory report indicates unidentified hydrocarbons >C8 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