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SIERRA Table 2 Analytic Results for Ground Water - Chevron Service Station #9-6171, 6633 Pacific Avenue, Stockton, California (continued) EXPLANATION ANALYTIC LABORATORIES TPPH(G)=Total Purgeablc Petroleurn I Ivdroc.arbons as GasolmL SEg=Sequoia Analytical Laboratory of Redwood City, California TOG =Totai Oil and Grease GTEL=Groundwater Technology, Inc , of Sacramento,California B= Benzene SAL =Supenor Analytical Laboratory of Martinez, California T=Toluene E=Ethylbenzenc. NOTES X=Xylenes EDB =Ethylene dibromide t This well was dry FC = Fecal coliform bacteria Typical gasoline pattern not present Peak at 7 2 minutes subtracted from gasoline range before =Not analyzed/not applicable, calculating gasoline concentration DHS = Department of Health Services '• Non-gasoline components which were not identified by the laboratory present in sample at 150 MCLS= Maximum Contaminant L&vels ppb, 11/29/90 Non-gasoline components which were not identified by the laboratory present in RALs = Recommended Action l evcls sample at 300 ppb, 3/14/91 NE = Not established ' Gasoline range concentration reported Peaks not associated with gasoline are observed early in the chromatogram ANALYTIC METHODS Z Gasoline range concentration reported The chromatogram shows only a single peak 3 Both gasoline and a single solvent peak are observed in the chromatogram 8015=EPA Method 5030/8015 for TPPH(G) ° Both gasoline and multiple solvent peaks were observed in the chromatogram 602 =EPA Method 602 for BTEX s Both gasoline and a single solvent peak (chlorinated)were observed in the chromatogram 8020= EPA Method 8020 for BTEX 6 Gasoline range concentration reported, peaks are representative of tetrachloroethene and trace 504=EPA Method 504 for EDB amount of gasoline 503E =Standard Methods Method 503E for TOG 910=EPA Method 910 for Fecal coliform bacteria 14604T GW