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* i <br /> SIERRA <br /> Table 1 Water Level Data and Ground Water Analytic Results - Chevron Service Station #9-6171, 6633 Pacific Avenue, <br /> Stockton, California (continued) <br /> i <br /> EXPLANATION NOTES (continued) <br /> DTW=Depth to water ' Monitoring well abandoned on July 31 1992 <br /> TOC=Top of casing elevation 2EDB was also analyzed and not detected at detection limits of 0 2 <br /> GWE=Ground water elevation ppb <br /> msl=Measurements referenced relative to mean sea level 3 TOG was also analyzed and not detected at detection limits of 5,000 <br /> TPPH(G)= Total Purgeable Petroleum Hydrocarbons as Gasoline ppb <br /> B=Benzene 4 Gasoline range concentration reported Peaks not associated with <br /> T=Toluene gasoline are observed early in the chromatogram <br /> E=Ethylbenzene 5 Both gasoline and multiple solvent peaks were observed in the <br /> X=Xylenes chromatogram <br /> EDB=Ethylene dibromide 6 Uncategonzed compound is not Included in the gasoline <br /> TOG=Total Oil and Grease hydrocarbon concentration <br /> VOC=Volatile Organic Compound 7 Detection limit raised due to surfactants <br /> ---=Not analyzed/not applicable 9 Typical gasoline pattern not present Peak at 7 2 minutes <br /> ppb=Parts per billion subtracted from gasoline range before calculating gasoline <br /> concentration <br /> ANALYTIC METHODS 9 Non-gasoline components which were not identified by the <br /> laboratory present in sample at 150 ppb, 11/29/90 Non-gasoline <br /> 8015=EPA Method 5030/8015 for TPPH(G) components which were not identified by the laboratory present in <br /> 602= EPA Method 602 for BTEX sample at 300 ppb, 3/14/91 <br /> 8020=EPA Method 8020 for BTEX 10 Gasoline range concentration reported,peaks are representative of <br /> 504= EPA Method 504 for EDB tetrachloroethane and trace amount of gasoline <br /> 503E=Standard Methods Method 503E for TOG i 1 Gasoline range concentration reported The chromatogram shows <br /> 8240=EPA Method 8240 for VOC s only a single peak <br /> " Both gasoline and a single solvent peak(chlorinated)were observed <br /> NOTES in the chromatogram <br /> 13 Both gasoline and a single solvent peak are observed in the <br /> TOC elevations were surveyed by Ron Miller Licensed Land Surveyor, chromatogram <br /> CE #15816 on September 5 1990 14 Detection limit raised due to foaming sample matrix <br /> 15 TOC elevation for well MW-7 was surveyed by Ron Miller,Licensed <br /> Product thickness was measured with an MMC flexi-dip Interface Land <br /> probe Surveyor, PE#15816 on September 13 1993 <br /> 16 Carryover from previous sample in run sequence made it necessary <br /> to analyze backup sample Backup sample foamed, therefore no <br /> data is available <br /> " The sample was diluted due to high concentration of non-target <br /> compounds Hydrocarbons in the gasoline sample do not match the <br /> gasoline standard pattern <br /> '6 The sample was diluted due to high concentrations of non-target <br /> compounds <br /> 14604T WLG <br />