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i S " <br /> 'o 11,1119- A FAUVAK <br />. N1r K <br /> t i_;;ivi1 i /SCT0, ;CLS Working to Restore Nature <br /> 1710 Main Street April 2, 1992 <br /> Escalon, CA 95320 <br /> Phone (209) 838-3507 <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 El 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 SCFM and never exceeded 10 SCFM. <br /> The average influent concentration of the extracted vapors was 7100 ,ug/Q or 2671 ppm(v) Total <br /> Petroleum Hydrocarbons as Gasoline (TPHg) (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 µg/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 low oxygen levels (7 1%) and relatively 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 /> 40 Oxidizer which will significantly improve the contaminant removal rate from the soil <br /> WPLP4292 MAB <br />