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Y _ :� _ <br /> r sem " <br /> KM <br /> IIYDROCEOL,WtC 1NVF-MCAT QN <br /> Eamon Company,U.S.A <br /> Retail Store 7-3708 <br /> 2705 Country Club Boulevard <br /> Stockton,Catifomia <br /> Dell-3 Project No.40-91.,M <br /> Paga 6 <br /> 3.4 Ground Water Analytical Results <br /> Ground water samples were collected from each of the three monitoring wells on August 23, 1991. Each <br /> sample was submitted for analysis of BTEX and TPH as gasoline by FPA Methods 8015 and 8B:0. in . <br /> addition,aground water sample from monitoring well MW-2 was submitted for analysis of total recoverable <br /> petroleum hydrocarbons(TRPH)by EPA Method 418.1. Analytical results are summarized in Table 4,and <br /> " copies of the certified Iaboratory reports are included in Appendix E The inferred distribution of dissolved <br /> benzene in ground water beneath the site is illustrated in Figure 6. <br /> TABLE 4 <br /> i <br /> Ground Water Sample Ani lyticzl Results <br /> August 23, 1.491 <br /> r Concentrations in Parts per BIllion(ppb) <br /> i <br /> Monitoring TPHa <br /> Well Benzene Toluene Ethylbenzene xylenes as easoline 'i'RPHb <br /> hA I <br /> MW-1 <0.5 <0.5 <0.5 <0S <50 NA` <br /> t <br /> MW-2 <0.5 <0.5 4.9 <0.5 82 <1,000 <br /> MW-3 240 3.4 a2 S 3.5, 630 NA <br /> aTotal petroleum hydrocarboas. <br /> "Total recoverable petroleum hydrocarboni <br /> eNot analyzed.. <br /> v 4.0 DISCUSSION <br /> Petroleum hydrocarbon constituents were not detected in the soil samples submitted for chemical analysis. <br /> Analytical results indicate that petroleum hydrocarbon constituents were present in ground water samples <br /> collected from monitoring wells MW-2 and MW-3. Concentrations of TPH as gasoline in the groundwater <br /> _ samples collected from monitoring wells hfW2 and MW-3 were_82 ppb and.630.ppb,respectively.-Benzene---- - --- —=- — <br /> was only detected in the ground water sample collected from monitoring well MW-3,at a concentration of <br /> 240 ppb. <br /> y <br /> RPT002.BP = <br />