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Syshm status Sol Vapor 6macdc n and Erdssion Contra System 620 West Charter Way Stockton California The following parameters were monitored during system startup and each site visit vapor flow from the recovery wells to the thermal oxidizer, vacuum in the recovery manifold, combustion temperature, and the flame ionization detector (FID) measurements of the system's influent and effluent concentrations Influent and effluent vapor samples were collected on September 17 and October 1, 1992, for BTEX and TPH concentrations The data collected were used to estimate the hydrocarbon mass flow rate through the system, the volumetric airflow, and benzene and TPH emissions from operation of the system A summary of the system operating data is included in the enclosed spreadsheet Estimates of soil vapor extraction and emission rates along with an example extraction rate calculation are also included The hydrocarbon destruction efficiency is based on the influent mass flow rate minus the effluent mass flow rate divided by the influent mass flow rate and is expressed as a percent The vapor flow rates to the thermal oxidizer varied from 240 to 247 standard cubic feet per minute Based on the vapor sampling analytical results, the estimated TPH extraction on September 17 and October 1, 1992, were 406 8 and 435 9 pounds per day (lbs/day), respectively The vapor emissions have not exceeded 0 9 lbs/day TPH or 0 13 lbs/day . benzene Interpretation of analytical results and system data indicate that the destruction efficiency for TPH and benzene was greater than 99 percent Copies of the vapor analytical results are enclosed Based on the field FID monitoring on September 17, 22, 24, and October 1, 1992, the estimated TPH extraction from the soil vaned between 1110 5 and 69 3 lbs/day The vapor emissions from system operation have not exceeded 1 4 lbs/day TPH The thermal oxidizer destruction efficiency for TPH was greater than 99 percent In summary, during the first 2 weeks of system operation, the thermal oxidizer has reduced the hydrocarbon emissions from the sod vapor extraction system by greater than 99 percent on two consecutive vapor sampling events, and four consecutive FID site monitoring visits The TPH emissions during this period were well below the 30 87 lbs/day discharge limit in the thermal oxidizer mode allowed by the air permit Effective November 17, 1992, the APCD approved monthly system monitoring Future system monitoring data will be updated and stored inside the remediation fence area on site 91-246F LTR 2