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as, xy. <br /> W <br /> i <br /> EA f ngincaring.Science,aneTcchnology <br /> f..;. <br /> A <br /> FA 26 Ntovcini►cr 1991 <br /> Michael F Escatto <br /> Air Po4ution Inspector <br /> San Joaquin County Air Pollution Contin District <br /> Ito.[lox 2009 <br /> 2321 W.Washington Street,Suite I <br /> Stockton,Califumia 95201 <br /> R13:Rcp orting of I lydrocarWn Emissions and lxstruction Efficicncic,for the V.1pt1r Extraction <br /> and'Freauncnt Systcm Operation at Chevron SS9.1918,451lanfing Way,Stxkton,CA <br /> Dear Mr.liscotto: <br /> Encloscd arc the results from effluent monitoring of the vapor extraction sand treatnicnt systcni <br /> operating at Chevron SS9-1918,45 Harding Way,Stockton,California. The thermal oxidizer <br /> has been to operation for i clay since the end of the last reporting period(24 October 1991)• <br /> The thermal oxidizer data table(Table 1)includes analysis date,operating;temperature,hydro- <br /> carbon compound concentrations,average daily influent concentration,and percent total volatile <br /> hydrocarbon destruction efficiency for each effluent sample analyzed. Since the last mporting <br /> period,all cfflur.nt samplrs have exceeded the 95%miniintim destruction efficiency,averiring <br /> 98.54%destruction efficiency. <br /> Should you have any questions regarding this project or the contents of this Iettcr,please do not <br /> hesitate to call us orTcrry Winsorat the above nurn bcr. <br /> Sinccrcl , 6) <br /> oc Niuchlcck <br /> Environmental Chemist <br /> 1Jciuglas .Ona,Ph.D. <br /> Project Manager <br /> JD:n:ws<.�s1111tf1Y�a1f4LTR0 <br /> Enclosures <br /> cc: Clint Rogers-Chevmn <br /> hury Mcays-San Joaquin County Psiblic Health Services <br />