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NY. <br /> ASS OCIATES INC <br /> wells MW1 through MW6 The sample from well MW7 contained benzene at a concentration of 97 <br /> parts per billion (ppb) The samples from wells MW2, MW5, MW6, and MW7 contained MTBE at <br /> concentrations of 15 ppb, 5,200 ppb, 18 ppb, and 130,000 ppb, respectively Additionally, well MW7 <br /> contained t-amyl methyl ether at a concentration of 500 ppb <br /> Analytical results are summarized In Table 2 Laboratory reports with chain-of-custody documents are <br /> included in Attachment 2 <br /> i <br /> I <br /> RECOMMENDATIONS <br /> ATC recommends continued quarterly monitoring and sampling of all site wells (MW 1 through MW7) <br /> for TPHg, TPHd, BTEX, and MTBE by EPA Methods 8015/8020 <br /> If you have any questions or comments regarding thus project, please contact our office at (209) 579- <br /> 2221 <br /> Respectfully submitted, <br /> ATC Associates Inc <br /> John Sellman <br /> Staff Geologist " _ <br /> pv <br /> 2Je Homsey, P E 1� mpl day a <br /> CA Registered Civil Engineer No C47410 `�y i <br /> LICL <br /> Attachments <br /> cc Mr Marty Hartzell, CRWQCB <br /> James"J"Mills, Westrec Properties <br /> w\wordpro\62514\quar 1y\2gr-2002 dm 4 <br />