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Pcrformance Report F Weber Point October 9, 1992COMA TPHG and benzene removed by the thermal oxidizer and activated carbon systems Calculations are based on the flow rates and operating times from the operational logs, and the average analytical value for that time period Operational logs of the GAC performance from July 30 through October 2, 1992 are presented In Attachment 2 All vapor extraction system performance has been in accord with conditions specified in the Unified Air Pollution Control District (CTAPCD) permit No. AP 92-111. Both the thermal oxidizer and carbon adsorption units have operated at efficiencies well above 90 percent The rate of soil ventilation has been less than 200 SCFM for both systems The average influent hydrocarbon concentrations have not exceeded 625 parts per million (ppm) as gasoline for the carbon adsorption unit or 5200 ppm for the thermal oxidizer. Effluents have not exceeded 32 ppm from the GAC system or 259 ppm from the thermal oxidizer. Both influent and effluent vapor streams have been monitored with a Photolonization Detector (PID) three times a week since start-up. Also, influent samples have been collected weekly for laboratory analysis of TPHG and benzene, toluene, ethylbenzene, and total xylenes (BTEX) Vapor extraction system effluent samples are collected on a monthly basis for laboratory analysts of TPHG and BTEX Analytical results for these samples are listed In Table 2. All laboratory results are presented with chain-of-custody documents In Attachment 3 If you have any questions regarding this project please call me or Greg Stahl at (209) 838-3507 • Respectfully, RESNA Industries Marcie R. McCabe Staff Geologist /L—----- Gregory P Stahl CA Registered Geologist No 5023 MRM Attachments PC Ms Gertrude Weber - C.M Weber Enterprises, Inc Jeanne Zolezzi - Neumiller & Beardslee Steve Schneider - San Joaquin County Public Health Services VEP MRM