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S E C 0 R <br /> Mr Harlin Knoll <br /> October 28, 2005 <br /> Page 3 <br /> CONCLUSIONS <br /> The concentrations of TPHg, TPHd, BTEX, and MtBE have shown consistently decreasing <br /> trends in reported concentrations since 1998 In fact, the detected concentrations of TPHg <br /> and TPHd in downgradient wells MW-1, MW-5, MW-6A, and MW-613 have approached non- <br /> detect over the past several sampling events, and MtBE has been reported at less than its <br /> primary MCL for over 2 years In addition, no constituents for which analyses have been <br /> performed have ever been detected In well MW-66, indicating that the vertical extent of <br /> groundwater impact has been defined, and the petroleum-hydrocarbon impact to <br /> groundwater is limited to shallow groundwater at the site in the vicinity of the former tank <br /> and product dispenser islands Furthermore, it appears that the concentrations of detected <br /> petroleum hydrocarbons In these areas have shown a consistent decrease over the past 6 <br /> to 7 years <br /> RECOMMENDATIONS <br /> • Therefore, Chevron and SECOR would appreciate an opportunity to meet with San Joaquin <br /> county Environmental Health Department (EHD) representatives in early 2006 to discuss <br /> future activities for this site In particular, we would be interested in discussing additional <br /> work or characterization necessary to bring this site to closure <br /> If you have any questions or concerns regarding the contents of this report, please feel free <br /> to contact George Forsythe at (559) 271-2650, ext 235 <br /> Sincerely, <br /> SECOR International Incorporated <br /> ,��pir0 GFD! <br /> A04--- <br /> George Forsythe, P G <br /> Senior Geologist` NWo 641 <br /> a m >� <br /> � Z <br /> of <br /> N 1Files\ProjectslChevron\Retaill#9-8632(Tracy)1Penodic Monitonng1200513Q2005 QMR 98632 doc <br />