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e 2 and Table 3 in <br /> 14. No sample was submitted from MW-1 due to the presence of free ports are included as Attachment 2e <br /> attached report summarize groundwater analytical data and laboratory rep islands (MW- <br /> The highest concentrations of hydrocarbons appear to remain onsite in the vicinity of the pump <br /> MW-3 . When compared to the June 2000 sampling event,unchanged�n the remainder of theaweldlsn <br /> 1 and ) <br /> MW-3, MW-4, MW-5, and MW-9, while they remained relatively <br /> Changes in hydrocarbon concentrations are most likcollec�d tot further evaluate thof groundwater e dissolved hydrocarbon <br /> remediation efforts. Additional monitoring data will be co <br /> plume. <br /> The appearance of free product in MW-1 appears to be the result of condensed soil vapor due to vapor <br /> extraction efforts. Site inventory records and leak detection systems were checked to assure that a new <br /> release had not occurred; no indications of a release were identified. At this time product is being removed <br /> from MW-1 by hand bailing and the use of a passive skimmer. Vapor extraction efforts at MWA have <br /> temporarily ceased until free product can be recovered. <br /> Remediation Activities—Third Quarter 2000 <br /> In August and September 1999, SECOR installed a vapor extraction/air sparging system at the subject site to <br /> remediate hydrocarbon-impacted soils and groundwater. System operation began December 13, 1999. <br /> The vapor extraction system consists of ten wells(W-1 through W-8, MWA and MW-3) manifolded within the <br /> remediation compound. Vapors are extracted with a blower and destroyed with a catalytic oxidizer with a <br /> destruction efficiency of at least 95%. The air sparging system consists of 4 wells (AS-1 through AS-1). An <br /> air compressor is used to introduce air into the sparging wells, and vapors are be recovered and destroyed <br /> with the SVE system. <br /> Based on the analysis of influent samples, SECOR estimates that 3,075 pounds (504.2 gallons) of gasoline <br /> were removed and treated during the reporting period at an average extraction rate of 159 scfm. SECOR <br /> estimates that 26,701.6 pounds (4,377.3 gallons)of hydrocarbons have been removed since system startup. <br /> Approximately 34 gallons of free product has been bailed from MW-1 since its detection if February 2400. <br /> Attachment 3 in SECOR's report includes soil vapor analytical results and system efficiency results. <br /> If you have any questions regarding these matters, please do not hesitate to contact me at(206)286-4495. <br /> Sincerely, <br /> Time Oil Co. <br /> Anastasia E. Duarte-Wilkinson <br /> Environmental Toxicologist <br /> cc: Ms. Elizabeth Thayer <br /> California Regional Water Quality Control Board <br /> letterslcalif1404914049kt8_doc <br /> 2 <br />