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i _ Mtn <br /> Fw <br /> y <br /> i <br /> APR 1 0 11'9% <br /> =11'a ENTMA <br /> Working to Restore Nature <br /> 1710 Main Street April 2, 1992 <br /> Escalon,CA 95320 } �/ <br /> Phone:(209)838-3507 I <br /> FAX:(209)838-3509 <br /> Mark Schonhoff <br /> San Joaquin County <br /> Air Pollution Control District <br /> P.O. Box 2009 <br /> Stockton, California 95201 <br /> RE: C.M. Weber Enterprises, Inc., Property <br /> 141 North EI Dorado St., Stockton <br /> APCD Permit No. AP 91-467 <br /> Dear Mr. Schonhoff: <br /> This report summarizes the performance of the Vapor Extraction System located at the above <br /> referenced site (Figure 1). <br /> The system became operational on January 24, 1992 and was shut down on March 13, 1992. <br /> The system consisted of an internal combustion engine coupled to four vapor extraction wells <br /> and operated for a total of 519.1 hours. A copy of the operational log is provided in Attachment <br /> 1. The average flow rate of extraction vapors was 5 SUM and never exceeded 10 SCFM. <br /> The average influent concentration of the extracted vapors was 7100 pg1t or 2671 ppm(v)Total. <br /> Petroleum Hydrocarbons as Gasoline (T?Hg) (Attachment 2). <br /> During the operational period of this system an estimated 70 pounds of hydrocarbon <br /> contaminants were removed from the soil. The average effluent hydrocarbon concentration was <br /> 400 I-g/1 or 150 ppm(v) TPHg (Attachment 3). <br /> Influent and effluent samples were collected from the system on February 10, 1992. Laboratory <br /> results from a Calderon inert gas analysis (Attachment 4) show that the influent vapor stream <br /> contained very Iow oxygen levels(7.1%)and reh;tively high carbon dioxide levels(5.1%). The <br /> low oxygen and high carbon dioxide levels in the influent vapor stream affected the engine's <br /> ability to efficiently extract and destroy the contaminated vapors entering it. It was therefore <br /> necessary to shut down the internal combustion engine and implement a more effective <br /> remediation technology. <br /> An Authority of Construct permit was granted on March 25, 1992, for a 250 SCFM Thermal <br /> Oxidizer which will significantly improve the contaminant removal rate from the soil. <br /> wrLn4M.tisnn <br />