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. The appearance of free product in MW-1 appears to be the result of condensed soil vapor due to vapor <br /> extraction efforts At this time product is being removed from MW-1 by continued vapor extraction, hand <br /> bailing, and the use of a passive skimmer <br /> Remediation Activities—Fourth Quarter 2001 <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, MW-1 and MW-3) manifolded within <br /> the 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 recovered vapors are destroyed with the <br /> SVE system <br /> Based on the analysis of Influent samples, SECOR estimates that 1,357 pounds (222 5 gallons) of gasoline- <br /> range hydrocarbons were removed and treated during the reporting period at an average extraction rate of <br /> 163 scfm SECOR estimates that 37,165 pounds (6,092 7 gallons) of hydrocarbons have been removed <br /> since system startup Approximately 62 gallons of free product have been bailed from MW-1 since Its <br /> detection if February 2000 Tables A-1 and A-2 in SECOR's report include soil vapor analytical results and <br /> 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 /> A'e"" CwJ&"--- <br /> Anastasia E Duarte-Wilkinson <br /> Environmental Toxicologist <br /> cc Ms Elizabeth Thayer <br /> California Regional Water Quality Control Board <br /> letterslcalif1404914049154 doc <br /> 2 <br />