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The highest concentrations of hydrocarbons appear to remain onsite in the vicinity of the pump Islands (MW- 1) When compared to the March 2002 sampling event, hydrocarbon concentrations decreased in MW-1 while they remained relatively 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 2002 In August and September 1999, SECOR Installed a vapor extraction/air sparging system at the subject site to remediate hydrocarbon-Impacted sods 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 377 pounds of gasoline-range hydrocarbons were removed and treated during the reporting period at an average extraction rate of 53 scfm SECOR estimates that 38,178 pounds of hydrocarbons have been removed since system startup Approximately 62 gallons of free product have been bailed from MWA 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 If you have any questions regarding these matters, please do not hesitate to contact me at(206)286-4495 Sincerely, Time Oil Co �A& t' dUl(kyd astasia E Duarte-Wilkinson Environmental Toxicologist cc Ms Elizabeth Thayer California Regional Water Quality Control Board letterslcaldl404914049156 doc • 2