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Adhk <br /> SIERRA <br /> Table 2 Analytic Results for Ground Water- Chevron Service Station #9-6171, 6633 Pacific Avenue, Stockton, California(continued) <br /> Sample Date Analytic Analytic TPPH(G) TOG B T E X EDH <br /> ID Sampled Method Lab <---------------- ---------------------------------------ppb-------------- -- -- <br /> Bailer <br /> Bailer Blank <br /> (cont) 3/12/92 8015/8020 SAL <50 --- <0 5 <05 <0 5 <0 5 <br /> 6/11/92 8015/8020 SPA <50 --- <0 5 <0 5 <0 5 <0 5 <br /> 9/3/92 8015/8020 SPA <50 --- <0 5 <0 5 <0 5 <0 5 --- <br /> 12/17/92 $015/8020 SPA <50 --- <0 5 <0 5 <0 5 <0 5 --- <br /> DHS MCLS --- --- NE NE I --- 680 1 750 02 <br /> DHS I2Al q --- --- --- NE NE --- 100 --- <br /> EXPLANATION ANALYTIC LABORATORIES <br /> TPPH(G)=Total Purgeable Petroleum Hydrocarbons as Gasoline SE9=Sequoia Analytical Laboratory of Redwood City, California <br /> TOG-Total Oil and Grease GTEL=Groundwater Technology, Inc, of Sacramento, Califomia <br /> B=Benzene SAL =Superior Analytical Laboratory of Martinez California <br /> T=Toluene SPA=Superior Precision Analytical,Inc of Martinez and San Francisco,California <br /> E=Ethylbenzene <br /> X=Xylenes NOTES <br /> EDB-Ethylene dibromide <br /> ---=Not analyzed/not applicable t This well was dry <br /> DHS=Department of Health Services Typical gasoline pattern not present Peak at 7 2 minutes subtracted from <br /> MCLS=Maximum Contaminant Levels gasoline range before calculating gasoline concentration <br /> RALs p Recommended Action Levels •• Non-gasoline components which were not identified by the laboratory present <br /> NE a Not established in sample at 150 ppb, 11/29/90 Non-gasoline components which wtre not <br /> identified by the laboratory present in sample at 300 ppb, 3/14/91 <br /> ANALYTIC METHODS 1 Gasoline range concentration reported Peaks not associated with gasoline are <br /> observed early in the chromatogram <br /> 8015=EPA Method 5030/8015 for TPPH(G) 7 Gasoline range concentration reported The chromatogram shows only a single <br /> 602=EPA Method 602 for BTEX peak <br /> 8020=EPA Method 8020 for BTEX 9 Both gasoline and a single solvent peak are observed in the chromatogram <br /> 504=EPA Method 504 for EDB * Both gasoline and multiple solvent peaks were observed in the chromatogram. <br /> 503E-Standard Methods Method 503E for TOG ° Both gasoline and a single solvent peak (chlorinated) were observed in the <br /> chromatogram <br /> ° Gasoline range concentration reported,peaks are representative of tetrachloro- <br /> ethene and trace amount of gasoline <br /> 7 Monitoring well abandoned on July 31, 1992 by Soils Exploration Services of <br /> Benicia, California. <br /> ° Detection limit raised due to foaming sample matrix. <br /> 14604T GW <br />