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. Report of Findings <br />' Frontier Transportation <br /> 0200-024 <br /> March 3, 2000 <br /> Page 1 <br /> 1.0) INTRODUCTION <br /> Blakely Environmental investigations, Inc. (BEI[) was contracted by Frontier <br /> Transportation, Inc. to perform a site assessment at the Frontier Transport facility, 425 Larch <br /> Road, Tracy, CA (See Figure 1, Site Location Map). The purpose of the site assessment was to <br /> t define the lateral extent of dissolved petroleum hydrocarbons beneath the site and the vertical <br /> extent of adsorbed phase petroleum hydrocarbons near the former underground storage tanks <br /> (USTs). The San Joaquin County Public Health Services, Environmental Health Division <br /> (PHS/EHD), Carrol Oz, Senior REHS requested the additional site assessment on September 8, <br /> 1999. This report presents the results of the site assessment performed. <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. The site <br /> consists of a trucking facility with one metal frame building and all parking and work areas capped <br /> . by cement and/or asphalt. The site is located in an industrial park. <br /> Six (6) underground fuel storage tanks (USTs), three diesel tanks located northeast of the <br /> terminal and three gasoline tanks located southeast of the terminal, were removed from the site on <br /> July 21, 1995. Soil sample analysis identified total petroleum hydrocarbons as gasoline (TPH-g) <br /> and total petroleum hydrocarbons as diesel (TIIIH-d) in the gasoline tank excavation at maximum <br /> concentrations of 9,800 mg/kg and 120 mg/kg, respectively. Groundwater sample analysis <br /> identified dissolved phase TPH-d in the diesel excavation pit at a maximum concentration of <br /> 1,200 Itg/L. <br /> In August of 1996, Twinning Laboratories, Inc. (Twinning) advanced six vertical soil <br /> borings (B-I, B-2, B-3, MW-IRA, MW-IRB, and MW-2RA) and one angle boring (B-4) to <br />' depths between 10.5' and 12.5' below grade (bg) to assess subsurface conditions near the <br /> northeastern excavation. <br /> L In addition, two hand augers (S-I and S-2) were advanced to 3' bg to assess subsurface <br /> conditions beneath the dispenser and product lines and three groundwater monitoring wells, MW- <br /> 1 through MW-3, were drilled to approximately 25' bg to assess the subsurface water beneath the <br /> site. <br /> Initial subsurface water was encountered at 10.5' bg. Boring B-4 located northwest of the <br /> former USTs identified maximum TPH-g, BTEX (Benzene, Toluene, Ethylbenzene, and Xylene), <br />