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i <br /> Remediation Activities—Third Quarter 2002 <br /> In August and September 1999, SECOR Installed a vapor extractionlair sparging system at the subject site to <br /> remediate hydrocarbon-Impacted soils and groundwater The vapor extraction system consists of ten wells <br /> (W-1 through W-8, MW-1 and MW-3) manifolded within the remediation compound Vapors are extracted <br /> with a blower and destroyed with a catalytic oxidizer with a destruction efficiency of at least 95% The air <br /> sparging system consists of 4 wells (AS-1 through AS-1) An air compressor Is used to Introduce air Into the <br /> sparging wells, and recovered vapors are destroyed with the SVE system System operation began <br /> December 13, 1999 <br /> Based on the analysis of influent samples, SECOR estimates that 457 pounds of gasoline-range <br /> hydrocarbons were removed and treated during the reporting period at an average extraction rate of 59 scfm <br /> SECOR estimates that 38,636 pounds of hydrocarbons have been removed since system startup <br /> Approximately 62 gallons of free product have been balled from MW-1 since its detection in February 2000 <br /> Tables A-1 and A-2 in SECOR's report include sod 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 Cao <br /> Anastasia E Duarte-Wilkinson <br /> �i Environmental Toxicologist <br /> cc Ms Elizabeth Thayer <br /> California Regional Water Quality Control Board <br /> Iefterslcahf1404914049156 doc <br /> • <br /> 2 <br />