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Remedial Action Plan <br /> Frontier Transportation <br /> 11 June 17, 2004 <br /> : J Page 1 <br /> (:l 1 .0) INTRODUCTION <br /> Blakely Environmental Investigations, Inc. (BEII) was contracted by Frontier <br /> Transportation, Inc. to prepare a remedial action plan for the Frontier Transport facility, <br /> 425 Larch Road, Tracy, California (See Figure 1 , Site Locati�n Map). The San Joaquin <br /> County , Environmental Health I�v`iM& (PHS/EHD) is the lead <br /> -i regulatory agency. This Remedial Action Plan (RAP) addresses shallow soil <br /> ! - contamination from 10' to 35' below grade surface (bgs), MTBE impacted shallow <br /> groundwater and the unique inverted gasoline source in the soil which is located beneath <br /> j first water. The remedial action is necessary to prevent the potential exposure to the <br /> several residential properties located within 50-feet of the plume. <br /> J 2.0) SITE LOCATION AND HISTORY <br /> The site is located in Tracy, California at 425 Larch Road in the northwest quarter <br /> of section 16, Township 2 South, Range 5 East, Mount Diablo Baseline at Meridian. The <br /> J site consists of a trucking facility with one metal frame building and all parking and work <br /> areas capped by cement and/or asphalt. The site is located on the west side of an <br /> industrial park bounded by residential properties. <br /> Six (6) underground fuel storage tanks (USTs), three diesel tanks located <br /> northeast of the terminal and three gasoline tanks located southeast of the terminal, were <br /> - removed from the site on July 21 , 1995 . The removed USTs were located adjacent to <br /> Industrial Way with residential housing to the west on the other side of Industrial Way. <br /> Soil sample analysis identified total petroleum hydrocarbons as gasoline (TPH-g) and <br /> total petroleum hydrocarbons as diesel (TPH-d) in the gasoline tank excavation at <br /> ,I- maximum concentrations of 9,800 mg/kg and 120 mg/kg, respectively. Groundwater <br /> sample analysis identified dissolved phase TPH-d in the diesel excavation pit at a <br /> maximum concentration of 1 ,200 µg/L. <br /> In 2002, BEH excavated soil at the former location of the USTs. Subsurface <br /> concentrations indicative of free phase gasoline, BTEX and MTBE were identified <br /> inverted beneath the first water which pose an imminent threat to both sensitive receptors <br /> and the environment.. <br /> _ I <br /> i <br /> _l <br /> CJ <br />