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CONDOR EARTH TECHNOLOGIES INC. <br /> 1125 N. Golden State Blvd, 188 Frank West Circle <br /> July 30, 2001 Suite G Suite I <br /> Turlock, CA 95381 Stockton , CA 95206 <br /> (209) 668-9234 (209) 234-0518 <br /> FAX (209) 668-9248 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: Canepa's Car Wash, 6230 Pacific Avenue, Stockton, CA <br /> Site Code: 1225; Condor Project No. 1707 <br /> Dear Mr. Wong: <br /> This is just a brief note to let you know that the soil vapor extraction system has been shut down <br /> at Canepa's Car Wash on Paefic Avenue (Site 1225). Last Friday we conducted monitoring of the <br /> site and found that the destructive efficiency had dropped to between 80% and 90%. Inlet <br /> concentration was at about 55 ppm and outlet concentrations varied between 5 and 10 ppm. <br /> Under the air permit, we could not continue operation. <br /> The recent restart of the system has provided valuable data, not the least. of which is that soil <br /> vapor concentrations had not returned to the highs of over 1000 ppm experienced two years ago. <br /> In fact, the inlet concentrations were in line with those immediately before the system was shut <br /> down in February. Using this information, Condor is reevaluating the treatment technology. <br /> With the low inlet concentrations and expenses of over $2000 a month for natural gas, carbon <br /> treatment may be a more cost-effective treatment alternative. <br /> We will continue to keep you informed of our progress . <br /> Sincerely, <br /> CONDOR EARTH TECHHN�OLLOGIES, INC. <br /> ff <br /> 7Wm P.E. <br /> Project Manager <br /> cc: Mr. Remo Canepa, Cianepa's Car Wash <br /> PA1707 ranepa-Pacific\rnmspondenceVY-30-CC 1-Wonndoe <br /> ENVIRONMENTAL GEOLOGICAL ENGINEERING GEOTECHNICAL <br /> http://www.condorearth.com <br />