ARCHIVED REPORTS_XR0007156 - Laserfiche WebLink

Home Browse Search

fluctuations and remediation efforts Since the initiation of remediation efforts, hydrocarbon concentrations across the site have substantially decreased The appearance of free product in MW-1 appears to be the result of condensed soil vapor due to vapor extraction efforts At this time product is being removed from MW-1 by continued vapor extraction, hand balling, and the use of a passive skimmer Remediation Activities—Third Quarter 2001 In August and September 1999, SECOR installed a vapor extraction/air sparging system at the subject site to remediate hydrocarbon-impacted soils and groundwater System operation began December 13, 1999 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 Based on the analysis of influent samples, SECOR estimates that 2,017 6 pounds (330 7 gallons) of gasoline-range hydrocarbons were removed and treated during the reporting period at an average extraction rate of 178 scfm SECOR estimates that 35,808 pounds (5,870 gallons) of hydrocarbons have been removed since system startup Approximately 55 gallons of free product have been bailed from MWA since its detection if February 2000 Tables A-1 and A-2 in SECOR's report include soil 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 / J� � fiLy�p,r„r Anastasia E Duarte-Wilkinson Environmental Toxicologist cc Ms Elizabeth Thayer California Regional Water Quality Control Board Ietterslcalif1404914049148 dot 2