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i <br /> C E <br /> T <br /> CONDOR EARTH TECHNOLOGIES INC. <br /> 188 Frank West Circle <br /> September 24, 2001 Suite I <br /> Stockton , CA 95206 <br /> (209) 234-0518 <br /> FAX (209) 234-0538 <br /> Jeffrey C . F. Wong <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 E. Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> Re: Work Plan for Carbon Treatment of Soil Vapors <br /> Canepa's Car Wash, 6230 Pacific Avenue, Stockton, CA <br /> Site Code: 1225; Condor Project No. 1707 <br /> Dear Mr. Wong: <br /> This work plan, prepared by Condor Earth Technologies, Inc. (Condor) at the request of Mr. Remo <br /> Canepa, describes the installation and operation of a carbon treatment unit at Canepa's Car Wash facility <br /> located at 6230 Pacific Avenue, Stockton, California. This work plan was requested by Mr. Jeffrey Wong <br /> of the San Joaquin County Public Health Services/Environmental Health Division (PHS/EHD) in <br /> correspondence dated August 24, 2001 . <br /> Site Background <br /> Canepa's Car Wash consists of an automated car washing facility, a fuel station, and a convenience store. <br /> The car wash and fuel station have been in operation for approximately 20 years. In the spring of 1993, <br /> three underground fuel tanks, fuel lines, and dispensers were removed and replaced with a double-walled <br /> system. When the tanks were removed, contaminated soil was discovered and approximately 600 cubic <br /> yards of soil were removed from the fuel tank excavation area. <br /> Beginning in March 1993, one soil boring and a network of nine soil vapor extraction (SVE) wells were <br /> installed in the area of the fuel dispenser islands. Between September 1993 and March 1994, eight <br /> monitoring wells (MW- 1 through MW-8) were installed. <br /> Since March 1994, a soil vapor extraction and thermal oxidation treatment system has been in intermittent <br /> operation. Soil vapor concentrations, measured with a photoionization detector (PID), have decreased <br /> from 2,200 parts per million (ppm) to 55 ppm. With the decreased concentrations, the existing treatment <br /> system could not maintain 95% efficiency (air permit requirements), and the system was shut down in <br /> July 2001 . <br /> Carbon Treatment System <br /> Condor has evaluated the cost of installing and operating a carbon treatment system in place of the current <br /> thermal oxidation system. After an initial payback period of approximately 110 to 120 days, it is <br /> expected that the carbon treatment system operational cost will be less than 25% of the cost of operation <br /> for the existing thermal oxidation system (mostly in energy savings). <br /> I <br /> ENVIRONMENTAL GEOLOGICAL ENGINEERING GEOTECHNICAL <br /> http://www.condorearth.com <br />