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0 <br /> California Regional Water Quality Control Board ;- <br /> Central Valley Region ° <br /> v- <br /> Winston H.Hickox Sacramento Main Office Gray Davis <br /> taryfor Internet Address: http://ww .swrcb.ca.gov/mgcb5 Governor <br /> Secreecre3443 Rou <br /> al tier Road,Suite A,Sacramento,California 95827-3003 <br /> Pironmnmenfent Phone(916)255-3000•FAX(916)255-3015 <br /> rotection <br /> 5 December 2000 10 ;1 t!d <br /> Nick Nickerson Ed Koberstem Jay Allen <br /> Unocal DBG/AMG " Montgomery Wards Stone Brothers <br /> 8788 Elk Grove Blvd. 1331 South Harbor Blvd. Management Company <br /> Building 3, Suite 15 Fullerton, CA 92632 1024 W. Robinhood Drive <br /> Elk Grove, CA 95624 Stockton, CA 95207 <br /> OPERATION OF REMEDIAL SYSTEMAPPROVAL <br /> MONTGOMERY WARDS AUTO SERVICE, 5400 PACIFIC AVENUE, STOCKTON <br /> CLEANUPAND ABATEMENT ORDER (C&A)NO. 5-00-707 <br /> I reviewed the 28 November 2000 Continued Operation of Remedial System, and the 10 October 2000 Soil <br /> and Ground Water Remediation System Report, Third Quarter 2000 submitted by Enviromnentaludit, <br /> Incorporated(EAI) for the subject site. EAI is requesting approval to upgrade the soil and groundwater <br /> remediation system, and continue operating the system for another year. <br /> EAI started operating the soil and groundwater remediation system in November 1999, and appro imately <br /> 8,146 pounds (1,320 gallons) of TPHg has been removed from the site to date. The remediation system <br /> consists of seven soil vapor extraction (SVE) wells, eight dual vapor extraction/air sparge wells, d a <br /> thermal oxidizing unit. Beginning in March 2000, influent TPHg and benzene concentrations de reased, <br /> and EAI operated the remediation system intermittently from June through October 2000. SVE ellhead <br /> sampling in September 2000 shows total petroleum hydrocarbons range from 4 to 1000 parts per million <br /> by volume (ppmv), and the system influent concentration is 800 µg/l (converted from ppmv). Th refore, <br /> continued site remediation is required. <br /> Based on the reduced influent concentrations, continued destruction of influent petroleum hydroc bons <br /> using the thermal oxidizer is not economical. EAI proposes to upgrade the remediation system from a <br /> thermal to a catalytic unit and perform operation and maintenance activities for another calendar year. The <br /> proposed modifications are appropriate and are approved. <br /> If you have any questions or comments,please call me at (916) 255-3115. <br /> Marty HaAell<� a� <br /> Associate Engineering Geologist <br /> cc: Mr. Mark Owens, UST Cleanup Fund, SWRCB, Sacramento <br /> Mr. Mike Infuma, San Joaquin County Environmental Health Division, Stockton <br /> Mr. Steven Bright, Environmental Audit, Incorporated, Placentia <br /> Mr. Bob Yribarren, San Joaquin Delta College, Stockton <br /> California Environmental Protection Agency <br /> �d Recycled Paper <br />