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r <br /> 1 Application for Authority To Construct/Permit To Operate <br /> San Joaquin Valley Unified Air Pollution Control District I �� <br /> Thrifty Oil Co. Station #171 <br /> August 25, 1998 <br /> Page 2 <br /> it <br /> Process Description: <br /> The vapor extraction system will consist of vapor extraction wells(as source)and a thermailcatalytic <br /> oxidizer(vapor treatment unit). Hydrocarbon vapors are drawn from the�,vapor wells,through lateral <br /> i piping by a blower driven by a motor, and directed into the vapor treatment unit. The blower will <br /> draw vapors at a maximum flow rate of 200 CFM into the air pollution control device. <br /> The vapor treatment unit will initially be operated in thermal mode and at a later time, when the <br /> extracted vapor concentrations is significantly reduced that operation in the thermal mode will no <br /> longer be cost effective,the treatrnent unit will be switched into.catalytic mode. The system will <br /> continue operating until soil remediation is completed. The unit will operate 24 hours a day, 7 days <br /> a week. <br /> �i <br /> Instrumentation and Controls <br /> io <br /> The thermal/catalytic oxidizer will be equipped with a temperature indicator and recorder to measure <br /> the exhaust temperature within the combustion chamber. In thermal mode,the exhaust temperature <br /> will be the temperature after combustion. In the catalytic mode the exhaust temperature will be the <br /> c oxidizer will! automatically shut off as <br /> temperature after the catalyst. The thermal/catalytic y <br /> determined by the High/Low Thermal Oxidizer Exhaust Gas Temperature. <br /> d! j <br /> The maximum operation vapor concentration for this site will bef set ati9,100 ppmv for the thermal <br /> mode and 3,500 ppmv for the catalytic oxidation mode. When the inlet vapors exceeding these <br /> settings,the automatic dilution valve will be opened to dilute the inlet vapors with atmospheric air <br /> to the set concentration levels. �s <br /> i Emission Calculations <br /> I <br /> Vapor extraction rate: 200 CFM <br /> Destruction Efficiency: 99% for thermal Mode, 97% for catalytic mode <br /> Operating schedule: 24 hr/day, 365 days/year! <br /> { a <br /> Inlet TPH concentration(thermal)= 9,100 ppmv or less; ,. <br /> Assume benzene is 1% of TPH, inlet benzene concentration(thermal) = 91 ppmv or less <br /> Outlet TPH concentration(thermal)= less than 91 ppmv <br /> Outlet benzene concentration(thermal) = less than 0.9 ppmv <br /> r <br /> i <br /> '� it <br />