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1 <br /> I, Site Assessment Proposal <br /> Frontier Transportation <br /> jF Doc # 101501 <br />�u October 15, 1997 <br /> II4 <br /> r; 1 . 0) INTRODUCTION <br /> I <br /> On August 5, 1997, Blakely Environmental Investigations, Inc. was contracted by Frontier <br /> l Transportation Inc. to review available site test data and to identify best remediation for <br /> subsurface petroleum hydrocarbon residuals after removal of underground fuel storage tanks at <br /> the Frontier Transport facility, 425 Larch Road, Tracy, CA (See Figure 1 , Site Location Map) . <br /> ll Exclusively dissolved petroleum has been identified in the subsurface soil and shallow subsurface <br /> water at the trucking facility (site) . This proposal identifies additional testing necessary for <br /> delineation of the aerial extent of dissolved petroleum and monitoring of that petroleum for <br /> intrinsic biodegradation and spatial stability. <br /> 2.0) SITE LOCATION AND HISTORY <br /> The site is located in Tracy California at 425 Larch Road in the northwest quarter of <br /> section 16, Township 2 South, Range 5 East, Mount Diablo Baseline at Meridian. <br /> The .site consists of a trucking facility with one metal framed building and all parking and <br /> work areas capped by cement and/or asphalt. The site is located in an industrial park. Six (6) <br /> underground fuel storage tanks (USTs), three diesel tanks and three gasoline tanks, were removed <br /> from the site on July 21 , 1995 . Tank specifications are as follows : <br /> r <br /> i <br /> - TABLE 1 : Removed Underground Storage Tank Specifications <br /> Tank Contents Capacity (gallons) Construction <br /> 1 Gasoline 15400 Unknown <br /> 2 Gasoline 650 Unknown <br /> 3 Gasoline 650 Unknown <br /> _ ! 4 Diesel 12,000 Unknown <br /> 5 Diesel 12,000 Unknown <br /> - 6 Diesel 127000 Unknown <br /> Soil sample S- I -E, collected at 8 . 5' bg from the gasoline excavation pit (northern <br /> excavation), identified maximum petroleum hydrocarbon concentrations at 9,800 mg/kg, 84 <br /> mg/kg, 460 mg/kg, and 120 mg/kg as TPH-gas, benzene, toluene, and ethylbenzene, respectively. <br /> Groundwater grab samples from the diesel excavation pit identified a maximum concentration of <br /> - 1 <br /> L <br />