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property is the Trust of ;babel N Scott, P G Box 4316, Stockton, CA 95204 The contact <br /> person for California Fuels is Mr Da%id Atwater <br /> California Fuels coni crted the retail "gas station" to a wholesale fuel cardlock <br /> This was accomplished by the installation of a fucling computer and by the removal <br /> of retail pumps in far or of w holesalc style units The site has submersible pumps <br /> equipped with leak detectors (CFI addition at the subpump) The site has at various <br /> times sold all grades of gasoline, but now sells gasoline and diesel fuels The original <br /> tanks arc still in place with no known history of repair since May 1983 <br /> 1.3 Local Topography and Geology <br /> The site is flat and probably underlain by fills, sub-fill hard pan or clay laycrs, <br /> including sand and silty clays and sands with low organic levels Sandy soils <br /> probably alternate with clay layers of i arious thicknesses to the top of the <br /> groundwater The lithology of the water bearing zones probably consists of medium <br /> to coarse sands, with interbedded clays The top of the shallowest groundwater is <br /> estimated to occur 45 to 65+ feet below grade <br /> Nearby surface w atcrs include the Stockton Deep Water Channel 2 miles south of <br /> the site, Smith's Canal which dead ends 1 5 miles west of the site, and the Calarcras <br /> Riicr about 15 miles north of this site A canal in farmland was once located <br /> beneath Harding way, six tenths of a mile south of the site <br /> 1.4 Spill or Leak History <br /> A soil gas sure cy of the area surrounding the tank and pump islands at the <br /> subject site was conducted by Stall Gardner and Dunne, Inc (SGD) in June 1989 A <br /> copy of their report is included in Appendix A The surveyed locations arc shown on <br /> Figure 1-3 SGD reported high concentrations of volatile hydrocarbons in shallow <br /> soils on the north side of the dispensing islands, and northeast of the 10,000 gallon <br /> unleaded gasoline tank The results suggest tank or pipeline failure, o%crfill tank <br /> spillage, or spillage during line replacement or repair actions <br /> California Fuels ini entory control s3stem has been in place since 1983 Though <br /> not all records haN a been retained, tank testing has been performed as required by <br /> local agencies for the past 6 )ears (92 not due yet) with all results showing pass or <br /> tight tank results California Fuels hal a used several different methods of tank <br /> testing to confirm their results <br /> 1.5 Object and Scope of Work <br /> The object of the planned work is to evaluate soil and groundwater quality <br /> adjacent to the underground storage tanks and dispensing island located at the site <br /> To complete this task, California Fuels plans to <br /> 1) Adi ance three soil borings and construct groundwater monitoring wells in <br /> all three borings adjacent to the diesel tank, regular and unleaded regular <br /> gasoline tanks, and pump island at the site The wells will be constructed to <br /> monitor both dissolved and free phase liquid hydrocarbons The wells will <br /> be located as shown on Figure 1-4 <br /> 4 <br />