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t while they remained essentially unchanged in the remainder of the wells Since the initiation of remediation efforts, hydrocarbon concentrations across the site have substantially decreased Remediation Activities—Second Quarter 2003 In August and September 1999, SECOR Installed a vapor extraction/air sparging system at the subject site to remediate hydrocarbon-impacted soils and groundwater The vapor extraction system consists of ten wells (W-1 through W-8, MW-1 and MW-3) manifolded within the remediation compound Vapors are extracted with a blower and destroyed with a catalytic oxidizer with a destruction efficiency of at least 95% The air sparging system consists of 4 wells (AS-1 through AS-1) An air compressor is used to introduce air Into the sparging wells, and recovered vapors are destroyed with the SVE system System operation began December 13, 1999 Based on the analysis of influent samples, SECOR estimates that 6 6 pounds of gasoline-range hydrocarbons were removed and treated during the reporting period at an average extraction rate of 45 scfm SECOR estimates that 38,855 pounds of hydrocarbons have been removed since system startup Although it was not present during Second Quarter 2003, approximately 62 gallons of free product have been bailed from MW-1 since its detection In February 2000 Tables A-1 and A-2 in SECOR's report include sod vapor analytical results and system efficiency results Due to low Influent concentrations, the system was shut off from May 2, 2003 to June 5, 2003 Hydrocarbon concentrations in the system's influent did not increase when the system was restarted on June 5 If you have any questions regarding these matters, please do not hesitate to contact me at(206)286-4495 Sincerely, Time Oil Co A&6*C 4/(, (� /9/1-, �4-_Z,J& _,� Anastasia E Duarte-Wilkinson Environmental Toxicologist cc Ms Elizabeth Thayer California Regional Water Quality Control Board letters/calif/4049/4049160 doc i