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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) i 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 ' TOG was also analyzed and not detected at detection limits of 5,000 ppb msl = Measurements referenced relative to mean sea level TPPH(G) =Total Purgeable Petroleum Hydrocarbons as Gasoline ` GasoIine range concentration reported Peaks not associated with gasoline are B = Benzene observed early in the chromatogram T = Toluene ' Both gasoline and multiple solvent peaks were observed in the chromatogram E = Ethylbenzene s Uncategonzed compound is not included in the gasoline hydrocarbon X =Xylenes concentration EAB = Ethylene dibromlde m Detection lint raised due to surfactants TOG =Total Oil and Grease s Typical gasoline pattern not present Peak at 7 2 minutes subtracted from VOC = Volatile Organic Compound gasoline range before calculating gasoline concentration MTBE= Methyl t-Butyl Ether ' Non-gasoline components which were not identified by the laboratory present in — = Not analyzed not applicable sample at 150 ppb, 11/29/90 Non-gasoline components which were not ppb = Paas per billion identified by the laboratory present in sample at 300 ppb,3114/91, 10 Gasoline range concentration reported, peaks aro representative of ANALYTIC METHODS tetrachloroethane and trace amount of gasoline Gasoline range concentration reported The chromatogram shows only a single 8015 = EPA Method 5030/8015 for TPPH(G) peak 602 = EPA Method 602 for BTEX " Both gasoline and a single solvent peak (chlorinated) were observed in the 8020 = EPA Method 8020 for BTEX chromatogram 504 = EPA Method 504 for EDB " Both gasoline and a single solvent peak are observed in the chromatogram 503E= Standard Methods Method 503E for TOG " Detection limit raised due to foaming sample matrix 8240 - EPA Method 8240 for VOC's is TOC elevation for well MW-7 was surveyed by Ron Miller,Licensed Land Surveyor,PE#15816 on September 13, 1993 NOTES 16 Carryover from previous sample in run sequence made It necessary to analyze backup sample Backup sample foamed,therefore,no data is available TOC elevations were surveyed by Ron Miller,licensed Land Surveyor,CE#'15816 " The sample was diluted due to high concentration of non-target compounds on September 5, 1990 Hydrocarbons in the gasoline sample do not match the gasoline standard pattern 's The sample was diluted due to high concentrations of non-target compounds Water level elevation data and laboratory analytic results prior to May 30,1995 were " MTBE was also analyzed and not detected at detection limit of 2 5 ppb compiled from Quarterly Monitoring Reports prepared for Chevron by Sierra '0 Laboratory reported discrete peak C8-C9 Environmental Services Z' Laboratory reported unidentified hydrocabron CC9 • Product thickness was pleasured with an MMC flexr-dip interface probe 5121 TQM