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. Performance Report <br /> Weber Pomt <br /> December 19, 1992 <br /> It is estimated that 357 pounds of TPHG has been retained within the canisters since operation <br /> began Table 2 presents an estimate of the amounts of TPHG and benzene removed by the <br /> thermal oxidizer and activated carbon systems. Calculations are based on the flow rates and <br /> operating times from the operational logs, and the average analytical value for that time period. <br /> Operational logs of the GAC performance from July 30 through November 2, 1992 are presented <br /> in Attachment 2. <br /> All vapor extraction system performance has been in accord with conditions specified in the <br /> Unified Air Pollution Control District (UAPCD) permit No. AP 92-11.1. Both the thermal <br /> oxidizer and carbon adsorption units have operated at efficiencies well above 90 percent. The <br /> rate of soil ventilation has been less than 200 SCFM for both systems. The average influent <br /> hydrocarbon concentrations have not exceeded 625 parts per million (ppm) as gasoline for the <br /> carbon adsorption unit or 5200 ppm for the thermal oxidizer. Excepting the point of <br /> breakthrough, effluents have not exceeded 32 ppm from the GAC system or 259 ppm from the <br /> thermal oxidizer <br /> Both influent and effluent vapor streams have been monitored with a PID weekly since start-up. <br /> Also, influent samples have been collected weekly for laboratory analysis of TPHG and BTEX. <br /> Vapor extraction system effluent samples have been collected on a monthly basis for laboratory <br /> analysis of TPHG and BTEX. <br /> If you have any questions regarding this project please call me or Greg Stahl at (209) 538-3507. <br /> Respectfully, <br /> RESNA Industries, Inc. <br /> aiz� <br /> Marcie R. McCabe <br /> Staff Geologist <br /> /LL-, / -x7etv-� <br /> Gregory P. Stahl <br /> CA Registered Geologist No. 5023 <br /> MRMlggk <br /> Attachments <br /> pc. Ms. Gertrude Weber - C.M Weber Enterprises, Inc. <br /> Jeanne Zolezzi - Neumiller & Beardslee <br /> Steve Schneider - San Joaquin County Public Health Services <br /> Paul Hayes - Shell Oil Co. <br /> VEPR"MRM <br />