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Ilk <br /> V � <br /> A S S O C I A T E S I fN C <br /> RESULTS <br /> Water levels have decreased an average of 0 35 feet since the last monitoring event on June 9, 1999 <br /> (Table 1) A groundwater gradient map was created using the data collected on September 2, 1999 <br /> (Figure 2) Groundwater flows northeast, away from the slough, with a gradient of approximately <br /> 0 07 feet/foot or 370 feet per mile <br /> No petroleum hydrocarbon constituents were detected in the groundwater samples collected from <br /> wells MW1, MW2, MW3, and MW4R TPHg and BTEX were not detected in any of the <br /> groundwater samples The samples from wells MW5 and MW6 contained TPHd at concentrations <br /> of 88 parts per billion (ppb) and 75 1 ppb, respectively, but was reported as an unidentified <br /> hydrocarbon The samples from wells MW5 and MW6 contained MTBE at concentrations of <br /> 6,710 ppb and 4 74 ppb, respectively Analytical results are summarized in Table 2 Laboratory <br /> reports with chain-of-custody documents are included in Attachment 2 <br /> RECOMMENDATIONS <br /> Due to the detectable concentrations of MTBE in the groundwater sample from wells MW2, MW5, <br /> • and MW6, ATC recommends continued monitoring and sampling of all site wells (MW 1 through <br /> MW6)for TPHg, TPHd, BTEX, and MTBE by EPA Methods 8015/8020 <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 /> 'DX4~ �Q" <br /> Drew Van Allen f <br /> Project Manager <br /> NN <br /> Jeanne Hornsey <br /> CA Registered Civil Engineer No C47410 # Xp �' <br /> !� <br /> Attachments � <br /> cc CRWQCB <br /> James "J" Mills, Westrec Properties <br /> w 1625141quart1yl3gr-1999 doc 2 <br /> rl <br />