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S E C O R <br /> • Quarterly Remedial Performance Summary <br /> October 29, 2004 <br /> Page 2 <br /> and oxidation reduction potential (ORP) readings in monitoring wells MW-2R and MW-4 on August <br /> 19 and September 16, 2004 Results of monthly groundwater sampling events are summarized in <br /> Table 2 Certified laboratory analytical reports and chain-of-custody documentation for the <br /> groundwater monitoring events conducted during the third quarter of 2004 are provided in <br /> Attachment B <br /> If you have any questions, please contact us at(916)661-0400 <br /> Sincerely, <br /> SECOR International Incorporated <br /> QROFESS/0 <br /> l'r <br /> Amy Draffan elw C 58399 "� m <br /> Protect Engineer Cr X <br /> EXP 1213112006 <br /> 10C1 IL <br /> Rusty Ef Benko y, P E sr�rFOFCA��FO��\P <br /> Sensor Engine r <br /> Attachments Figure 1 —Site Plan <br /> Figure 2—VW-1 TPHg, Benzene, MtBE, and TBA Groundwater Concentrations <br /> Figure 3—MW-2R TPHg, Benzene, MtBE, and TBA Groundwater Concentrations <br /> Figure 4—MW-4 TPHg, Benzene, MtBE, and TBA Groundwater Concentrations <br /> Table 1 —Ozone Injection System Operating Data <br /> Table 2—Ozone Injection System Groundwater Monitoring Data <br /> Attachment A—Field Data Sheets <br /> Attachment B—Certified Analytical Reports and Cham of Custody Documentation <br /> cc Ms Vicki McCartney, San Joaquin County Environmental Health Department <br /> Mr James Barton, RWQCB—Central Valley Regional Water Quality Control Board <br /> Mr Kyle Christie, BP <br /> RB/ad <br /> • <br /> 1\ConocoPh11hps\Tosco Marketing\11193\Reports\QRPS\11193 3QO4 QRPS doc SECOR lntemahonal incorporated <br />