SITE INFORMATION AND CORRESPONDENCE

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CE T CONDOR EARTH TECHNOLOGIES INC. 1125 N. Golden State Blvd, 188 Frank West Circle Suite G Suite I Turlock, CA 95381 Stockton, CA 95206 (209) 668-9234 (209) 234-0518 FAX (209) 668-9248 FAX (209) 234-0538 August 20, 2001 Jeffrey C. F. Wong San Joaquin County Public Health Services Environmental Health Division 304 E. Weber Avenue, Third Floor Stockton, California 95202 Re: Canepa's Car Wash, 6230 Pacific Avenue, Stockton, CA Site Code: 1225; Condor Project No. 1707 Dear Mr. Wong: As noted in our letter dated July 30, 2001 , the soil vapor extraction system was shut down at Canepa's Car Wash on Pacfic Avenue (Site 1225) on July 27, 2001 . On July 27"', Condor Earth Technologies, Inc: (Condor) conducted monitoring of the site and found that the destructive efficiency had dropped to between 80% and 90%. Net concentration was approximately 55 parts per million (ppm) and outlet concentrations varied between 5 and 10 ppm. Under the air permit requirement for 95% efficiency, we could not continue operation. The recent restart confirmed that the soil vapor concentrations had not returned to the high concentrations (over 1000 ppm) measured two years ago. In fact, the inlet concentrations were consistent with those immediately before the system was shut down- in February2001 . Consequently, Condor contacted a carbonAreatment system supplier to evaluate the costs of carbon treatment of the existing concentrations. The following comparisons assume no installation cost of the thermal treatment system, as it is already in place, and assumes that the carbon system would use the existing vapor extraction pump (now attached to the thermal treatment system). Estimated cost of thermal treatment (natural gas only): Total monthly cost for September 2000 — January 2001 : $ 14, 119.63 Total number of days of usage (same date range): 152 days Cost per day of natural gas: $92.89