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t <br /> ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY Unit Supervisors <br /> _ ` Donna K.Heron,R.E.H.S. Mike Huggins,R.E.H.S.,R.D.I. <br /> Carl Sorgman,R.E.H.S. <br /> 304 East Weber Avenue, Third Floor <br /> •-� <br /> Director <br /> At Olsen,R.E.H.S. Stockton, California 95202-2708 Douglas W.Wilson,R.E.H.S. <br /> c.. _..�P Program Manager Telephone: (209) 468-342.0 Margaret Lagorio,R.E.H.S. <br /> 4{ o R�' Laurie A.Cotuila,R.E.H.S. Robert McClellon,R.E.H.S. <br /> i Fax: {209) 464-0138 Mark Barcellos,R.E.H.S. <br /> Program Mm, .E <br /> OCT 2 6 2004 <br /> ESTATE OF JOE GARDELLA TRUST OF MARY GARDELLA <br /> DENNIS CASPE ESQ WINIFRED ALEXANDER <br /> 525 2ND ST 2035 N PACIFIC AVE <br /> SANTA CRUZ CA 95060 SANTA CRUZ CA 95060 <br /> RE: STEFANOS GASOLINE <br /> 1419 E CHARTER WAY <br /> STOCKTON, CA 95205 <br /> San Joaquin County Environmental Health Department(EHD)has received and reviewed Interim remediation <br /> lhork Plan(work plan)dated September 14,2004 prepared by Advanced GeoEnvironmental,Inc. (AGE),and <br /> lVelllnstallation and Soil Vapor Extraction Pilot Test Report(the report) dated September 10,2004 prepared by <br /> AGE that discusses the following: <br /> • Installation of a soil vapor extraction system(SVE)using an electrical catalytic oxidizer as the <br /> destruction mechanism for the recovered hydrocarbon vapor. AGE stated that a thermal oxidizer rs <br /> most efficient for vapor concentrations greater than 10,000 parts per billion(ppb),and for sites with y <br /> concentrations in the range of 2,000 to 10,000 ppb a catalytic oxidizer is more efficient. AGE <br /> proposed utilizing an electrical catalytic oxidizer as treatment for the recovered vapor,and converting <br /> to granular activated carbons(GAC)when the hydrocarbon concentrations decrease to 1,000 to 2,000 <br /> parts per billion. <br /> • Completing the SVE and in-situ ozone sparge (JOS)network <br /> • Start up and maintenance of the SVE system for 24 weeks. <br /> • Conduct a 24-week IOS pilot test <br /> EHD approves the work plan for installation and operation of the SVE and IOS systems for remediation as <br /> adequate and necessary pursuant to H&S 25296.10(x)(3). Although the tables in Appendix B of the work plan <br /> estimated the cost of running a catalytic oxidizer to be more expensive than GAC within 12 months of <br /> operation,a catalytic oxidizer is an appropriate alternative due to the level of vapor concentrations recorded in <br /> the air stream. The highest concentration of total petroleum hydrocarbons as gasoline(I'PH-g)recorded <br /> during the SVE pilot test was 13,000 micrograms per liter(ug/1),which is equivalent to approximately 3,692 <br /> parts per million by volume (ppmv). According to information in a manual titled Site Remediation Methods for <br /> Contaminated Soil(University of California Extension) : "At low contaminant concentrations,granular activated <br /> carbon canisters are used. At moderate contaminant concentrations (volatile orgaruc compounds less than <br /> 8,000 parts per million in the air stream),catalytic oxidizers... are used." Also,the Federal Remediation <br /> Technologies Roundtable web site �v�v v.frtr. ovr'matrix2 secrion4 4 59.htm1) states that: "Thermal oxidizers <br /> nitially high influent <br /> can often be converted to catalytic units after icontaminate concentrations decrease to Iess <br /> than 1,000 to 5,000 ppmv." <br /> EHD directs you to begin implementation of the work pian by November 18,2004. if you have any questions, <br /> please feel free to contact Jeffrey Wong at(209) 468-0335 <br /> Donna Heran,REHS,Director <br /> Environmental Health Department <br /> W Margaret L orio,REHS <br /> Jeffrey Wong,Senior REHS <br /> LOP/Site Mitigation Unit IV Supervisor <br /> C: RWQCB,Central Valley Region—James L.L.Barton,RG <br /> C: Advanced GeoEnvironmental,Inc.—Donna Sexton <br /> C: California Underground Storage Tank Clean Up Fund—Mark Owens <br />