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Table 1 Water Level Data and Groundwater Analytic Results - Chevron Service Station #9-6171, 6633 Pacific Avenue, Stockton, California (continued) EXPLANATION NOTES (continued) DTW = Depth to water TOC =Top of casing elevation ' Monitoring well abandoned on July 3l, 1992 GWE = Groundwater elevation 2 EDB was also analyzed and not detected at detection limits of 0 2 ppb msl = Measurements referenced relative to mean sea level 9 TOG was also analyzed and not detected at detection limits of 5,000 ppb TPPH(G) = Total Purgeable Petroleum Hydrocarbons as Gasoline 4 Gasoline range concentration reported Peaks not associated with gasoline are B = Benzene observed early in the chromatogram T =Toluene s Both gasoline and multiple solvent peaks were observed in the chromatogram E = Ethylbenzene 6 Uncategonzed compound is not included in the gasoline hydrocarbon X =Xylenes concentration EDB = Ethylene dibromide 7 Detection limit raised due to surfactants TOG = Total Oil and Grease ' Typical gasoline pattern not present Peak at 7 2 minutes subtracted from VOC = Volatile Organic Compound gasoline range before calculating gasoline concentration — = Not analyzed/not applicable ' Non-gasoline components which were not identified by the laboratory present ppb = Parts per billion in sample at 150 ppb, 11/29!90 Non-gasoline components which were not identified by the laboratory present to sample at 300 ppb,3114/91 ANALYTIC METHODS 10 Gasoline range concentration reported, peaks are representative of tetrachloroethane and trace amount of gasoline 8015 = EPA Method 5030/8015 for TPPH(G) " Gasoline range concentration reported The chromatogram shows only a single 602 = EPA Method 602 for BTEX peak 8020= EPA Method 8020 for BTEX 'x Both gasoline and a single solvent peak (chlorinated) were observed in the 504 = EPA Method 504 for EDB chromatogram 503E= Standard Methods Method 503E for TOG " Both gasoline and a single solvent peak are observed in the chromatogram 8240 = EPA Method 8240 for VOC's " Detection limit raised due to foaming sample matrix '6 TOC elevation for well MW-7 was surveyed by Ron Miller,Licensed Land NOTES Surveyor,PE#15816 on September 13, 1993 i6 Carryover from previous sample in run sequence made it necessary to analyze TOC elevations were surveyed by Ron Miller,Licensed Land Surveyor,CE#15816 backup sample Backup sample foamed,therefore,no data is available on 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 level elevation data and laboratory analytic results prior to May 30,1995 were " The sample was diluted due to high concentrations of non-target compounds compiled from Quarterly Monitoring Reports prepared for Chevron by Sierra Environmental Services * Product thickness was measured with an MMC flexi-dip interface probe I 5121 TQM