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v Z\ <br /> ifl ! <br /> A S S d C I A T E S I N C <br /> 2002 (Figure 3) Groundwater primarily flows east-southeast, away from the slough, with a <br /> gradient of approximately 0 07 feet/foot or 348 feet per mile <br /> TPHd was not detected in groundwater samples collected from wells MWi through MW5 and <br /> MW7 TPHg was not detected in any of the groundwater samples collected from wells MW1 <br /> through MW5 The concentration of TPHg in the sample from well MW7 was 230 parts per billion <br /> (ppb) BTEX were not detected in the groundwater samples collected from wells MW1 through <br /> MW4 The sample from well MW5 contained benzene at a concentration of 2 1 ppb The sample <br /> from well MW7 contained benzene at a concentration of 170 ppb The samples from wells MW5 <br /> and MW7 contained MTBE at concentrations of 6,800 ppb, and 120,000 ppb, respectively <br /> Analytical results are summarized in Table 2 Laboratory reports with chain-of-custody documents <br /> are included in Attachment 2 <br /> RECOMMENDATIONS <br /> ATC recommends continued quarterly monitoring and sampling of all site wells (MW1 through <br /> MW7) for TPHg, TPHd, and BTEX by EPA Methods 8015/8020 and fuel oxygenate additives by <br /> EPA method 8260 <br /> • If you have any questions or comments regarding this project, please contact our office at (209) <br /> 579-2221 <br /> Respectfully submitted, <br /> ATC Associates Inc <br /> John Sellman <br /> Staff Geologist <br /> ' � 'nI X <br /> 4 <br /> IN <br /> J e Hornsey, P Es <br /> CA Registered Civil Engineer No C47410 <br /> b C "i ty <br /> a <br /> Attachments <br /> cc Mr Marty Hartzell CRWQCB <br /> James "J" Mills, Westrec Properties <br /> w Iwordpro1625141quut1yl4gr-2002 doc 4 <br />