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Table 1 Water Level Data and Groundwater Anal teal Results-Chevron Service Station 119-6171 6633 Paetfie Avenue Stockton California continued EXPLANATIQN NOTES (continued) I TOC =Top of casing elevation 10 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 u Both gasoline and a single solvent peak (chlorinated) were observed in the teal=Measurements referenced relative to mean sea level chromatogram TPH(G) = Total Purgeable Petroleum Hydrocarbons as Gasoline " Both gasoline and a single solvent peak am observed in the chromatogram B = Benzene u Detection litmt raised due to foaming sample matnx T=Toluene u 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 made it necessary to analyze EDB = Ethylene dibromide backup sample Backup sample foamed,therefore,no data is available TOG =Total Oil and Grease 17 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 if 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 hinit of 2 5 ppb ppb = Parts per billion 70 Laboratory reported discrete peak C8-C9 ri Laboratory reported unidentified hydrocabron <C9 NnT>S a 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 u Laboratory report indicates unidentified hydrocarbons C6-C12,discrete peaks C6 September 5, 1990 v MTBE by EPA Method 8260 u 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 Momtonng 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 n 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 momtonng 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 ilexi-dip interface probe is Split sample taken by Levine-Fricke-Recon,analyzed by Quanterra Environmental Services of West Sacramento Analytical result supplied by Levine-Fneke-Recon ' Monitoring well abandoned on July 31, 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 29 Split sample taken by Levine-Fricke-Recon,analyzed by Quanterra Environmental 4 Gasoline range concentration reported Peaks not associated with gasoline are Services of West Sacramento Analytical result supplied by Levine-Fneke-Recon observed early in the chromatogram Laboratory report indicates unknown hydrocarbons detected&198 ppb See specific s Both gasoline and multiple solvent peaks were observed in the chromatogram analytical results for further explanation ` Uncategonzed corr4x"is not included in the gasoline hydrocarbon concentration 10 Split sample taken by Levine-Fricke-Recon,analyzed by Quanterra Environmental ' Detection limit raised due to surfactants Services of West Sacramento Analytical result supplied by 1,evine-Fneke-Recon s 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 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,3114/91 stzt�M 7