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R �A y.�yston ��y <br /> Sod Vapor on arW Emission Control rtCIR <br /> 620 West Chane►Way Stockton California <br /> The following p 9 Y parameters were monitored during system conversion to the catalytic <br /> oxidizer mode vapor flow from the recovery wells to the catalytic oxidizer, vacuum in the <br /> recovery manifold, combustion temperature, and the flame ionization detector (FID) <br /> measurements of the system's influent and effluent hydrocarbon concentrations. <br /> The data collected were used to estimate the hydrocarbon mass flow rate through the <br /> system, the volumetric airflow, and benzene and TPH emissions from system operation <br /> A summary of the system conversion operating data are included in the attached <br /> spreadsheet Estimates of sod vapor extraction and emission rates along with an example <br /> extraction rate calculation are also included The hydrocarbon destruction efficiency is <br /> based on the influent mass flow rate minus the effluent mass flow rate divided by the <br /> influent mass flow rate and is expressed as a percent <br /> Based on the January 7, 1993, system data and vapor sampling analytical results, the <br /> vapor flow rate to the catalytic oxidizer averaged 171 standard cubic feet per minute, and <br /> the TPH extraction from operation of the system was 43 58 pounds per day (lbs/day), the <br /> benzene extraction was 0 65 lbs/day The calculated TPH emissions were 0 72 lbs/day <br /> and the benzene emissions were 0 004 lbs/day Interpretation of analytical results and <br /> system data indicate that the destruction efficiency for TPH and benzene was greater than <br /> 98 3 percent Copies of the vapor analytical results are attached <br /> Based on the January 7, 1993, field FID monitoring, the TPH extraction from the sod <br /> averaged 73 96 lbs/day The estimated TPH emissions from system operation averaged <br /> 2 98 lbs/day The catalytic oxidizer destruction efficiency for TPH was equal to or greater <br /> than 95 percent <br /> In summary, during conversion, the catalytic oxidizer has reduced the hydrocarbon <br /> emissions from the soil vapor extraction system by greater than 95 percent based on <br /> vapor sampling results and FID site monitoring The TPH emissions from system <br /> operation on January 7, 1993, were well below the 9 31 lbs/day discharge limit in the <br /> catalytic oxidizer mode allowed by the air permit <br /> Effective November 17, 1992, the APCD approved monthly system monitoring Future <br /> system monitoring data will be updated and stored within the fenced remediation area. <br /> 91-246H LTR -2 <br />