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VV <br /> o <br /> A S S O C I A T E S I N C <br /> from wells MW6 and MW7 contained the highest concentrations of MTBE at 2,700 ppb, and 73,000 <br /> ppb, respectively There appear to be correlations between groundwater elevations and MTBE <br /> concentrations m MW5 (Figure 4) and MW7 (Figure 5) MTBE was also detected in well MW5 at a <br /> concentration of 1,000 ppb <br /> Analytical results are summarized in Table 2 Laboratory reports with chain-of-custody documents are <br /> included m Attachment 2 <br /> RECONE"ENDATIONS <br /> ATC recommends continued quarterly monitoring and sampling of all site wells (MW 1 through MW7) <br /> for TPHg, TPHd, and BTEX by EPA Methods 8015/8021 and fuel oxygenate additives by EPA <br /> method 8260 ATC also recommends evaluation of the vertical extent of impacted groundwater and <br /> will implement the workplan approved by the San Joaquin County Environmental Health Department <br /> If you have any questions or comments regarding this project, please contact our office at (209) 579- <br /> 2221 <br /> Respectfully submitted, <br /> ATC Associates Inc <br /> Mike Luksic, R G #7310 <br /> ,► <br /> Staff Geologist <br /> I's' <br /> J e Homsey,P E _ I ZJ 6-7 ,.. <br /> CA Registered Civil Engineer No C47410ir- -frig <br /> a <br /> AttachmentsV¢J ' w' a� <br /> a..�+3 <br /> cc Mr rim Barton, CRWQCB <br /> James"J"Mills, Westrec Properties <br /> s lenvwonmental1625141quaAllyl3gr-2003 doc 4 <br />