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C 'o7 <br /> I E T 191101 <br /> CONDOR EARTH TECHNOLOGIES INC. P/'/ 1? <br /> 1125 N. Golden State Blvd. 188 Frank West Circle <br /> August 15, 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: Work Plan Groundwater Mounding Study <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 a proposed groundwater mounding study at Canepa's Car Wash facility located at 6230 <br /> Pacific Avenue, Stockton, California. This work plan was requested by Mr. Jeffrey Wong of the San <br /> Joaquin County Public Health Services/Environmental Health Division (PHS/EHD) in correspondence <br /> dated May 18, 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. The tanks consisted of two 12,000-gallon gasoline tanks and one 5,000-gallon diesel tank. When <br /> the tanks were removed, it was discovered that the fuel lines had leaked and that the tanks had been <br /> overfilled . Approximately 600 cubic 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. Five of the monitor wells (MW- I through MW- <br /> 5) were constructed with a screened interval from approximately 50 to 70 feet below ground surface <br /> (bgs). The remaining monitor wells were constructed with a screen interval from approximately 45 to 65 <br /> feet bgs. The depth to groundwater measured at the site on October 22, 1998 was between approximately <br /> 35 and 37 feet bgs. <br /> Since installation of the wells, the groundwater elevations have gradually increased, with a total increase <br /> of about 20 feet since 1993 . The site has also exhibited mounding in the area of highest contaminant <br /> concentrations. The total mounding is less than 1 foot across the site, but the total height of the mound is <br /> unknown. <br /> ENVIRONMENTAL GEOLOGICAL ENGINEERING GEOTECHNICAL <br /> hftp://www.condorearth.com <br />