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l�q�,O�GEOtQi':tC,tNVF_S7'fAA't7()N <br /> Emm Company,U.S.A. <br /> RettW Sum 7-3703 <br /> f 2705 Country Club Hoalevard <br /> Stockton.Caum-min <br /> F tl Delta Project No.40-91S38 <br /> Por.6 <br /> # 3.4 Ground Witter AnfllXtErnl Results <br /> F ' Ground water samples were collected from each of the three monitoring wells on August 23, 1991. Each <br /> r, sample was submitted for analysis of 3TEX and TPH as gasoline by EPA Methods 8015 and 8020. In <br /> aaddition,a groundwaterP sample from monitoring well MW-2 was submitted for analysis of total recoverable <br /> t_ petroleum hydrocarbons(TRPH)by EPA Method 418.1. Analytical results are summarized in Table 4,and <br /> copies of the certified laboratory reports are included in Appendix E TI.e inferred distribution of dissolved <br /> t. <br /> benzene in ground water beneath the site is illustrated in Figure 6. <br /> " = f <br /> TAB LF.4 <br /> Ground Water Sample Analytical Results <br /> August 23,1991 <br /> Conzentmtlons In Parts per Billion(Ppb) <br /> 1.11„/ Monitoring TPHa <br /> WellBenzene Toluene Ethylbenzene Xylenes as gasoline b <br /> €� 0.5 <0.5 <50 NA° <br /> MW-1 <OS <0.5 < <br /> t+ MW-2 <0.5 <0 5 4.9 <0.5 82 <1,000 <br /> t; <br /> MW-3 240 ;` 3.4 <2.5 3.5 630 NA <br /> "'Total petroleum hydrocarbons. <br /> hbtd recoverable petroleum hydrorarboas. <br /> i "Not analyzed. <br /> � f <br /> 4.0 DIS USs O—N <br /> pe!ioleum hydrocarbon constituents were not detected in the soil samples submitted for chemical analysis. <br /> lti} <br /> 6r Analytical results Indicate that petraleum hydrocarbon constituents were present in ground water samples <br /> collected from monitoring wells MW-2 and MW-3. Concentrations of TPH,93 gasoline in the groundwater <br /> �w.. <br /> f <br /> samples collected from monitoring wells MW-2 and MW-3 were 82 ppb and 630 Ppb.respectively. Benzene - <br /> wax <br /> onlydetected in the ground water sample collected from monitoring well MW-3,at a cr,tcentration of <br /> { 290 ppb — -- -- - - --- - -- <br /> �.I <br /> l <br /> Let - -• <br /> RFT00IDP <br />