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V � <br /> A S S O C I A T E S I N C <br /> through MW4 and MW6 The sample from well MW5 contained benzene at a concentration of 1 6 <br /> parts per billion(ppb) and toluene at a concentration of 19 ppb The sample from well MW7 contained <br /> benzene at a concentration of 27 ppb The samples from wells MW5, MW6, and MW7 contained <br /> MTBE at concentrations of 1,800 ppb, 8 6 ppb, and 120,000 ppb, respectively Additionally, well <br /> MW7 contained t-amyl methyl ether at a concentration of 720 ppb <br /> Analytical results are summanzed in Table 2 Laboratory reports with chain-of-custody documents are <br /> included in Attachment 2 <br /> RECOMMENDATIONS <br /> ATC recommends continued quarterly monitoring and sampling of all site wells (MW1 through MW7) <br /> for TPHg, TPHd, BTEX, and MTBE by EPA Methods 8015/8020 <br /> �I <br /> w lwordpro1625141quadIyl2gr-2402 doc 4 <br />