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I ' Interim Corrective Action Plan • Frontier Transportation, Inc. ' December 20, 2005 Page 1 ' 1.0) INTRODUCTION Biophysics Environmental Assessments, Inc (BEA) was contracted by Frontier ' Transportation, Inc to prepare an intenm corrective action plan for the Frontier Transport facility located at 425 Larch Road, Tracy, California (See Figure 1 for site location) The / San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD),— � ' Vicki McCartney, EHS requested cost effectiveness evaluation of several site remediation ` methods on September 29, 2005 ' 2.0) SITE LOCATION AND HISTORY ' The site is located in Tracy, California at 425 Larch Road in the northwest quarter of section 16, Township 2 South, Range 5 East, Mount Diablo Baseline at Meridian The site consists of a trucking facility with one metal frame building and all parking and work areas ' capped by cement and/or asphalt The site is located in an industrial park Stix (6)underground fuel storage tanks (USTs), three diesel tanks located northeast of the terminal and three gasoline tanks located southeast of the terminal, were removed from the site on July 21, 1995 Soil sample analysis identified total petroleum hydrocarbons as ' gasoline (TPH-g) and total petroleum hydrocarbons as diesel (TPH-d) in the gasoline tank excavation at maximum concentrations of 9,800 mg/kg and 120 mg/kg, respectively Groundwater sample analysis identified dissolved phase TPH-d in the diesel excavation pit at ' a maximum concentration of 1,200 gg/L In August of 1996, Twinning Laboratories, Inc (Twinning) advanced six vertical soil ' borings (B-1, B-2t V- , MW-IRA, MW-IRB, and MW-2RA) and one angle boring (B-4) to depths between 10'S' and-1#5' below grade (bg) to assess subsurface conditions near the northea to assess subsurfaern ce condrt ons ion In addition, eneath he do advanced to 3' bg dispenser and product lines s and three ' groundwater monitoring wells MW-1 through MW-3 were drilled to approximately 25' b g g g PP Y $ ' to assess the subsurface water beneath the site Initial subsurface water was encountered at 10 5' bg Boring B-4 located northwest of the former USTs identified maximum TPH-g, BTEX (Benzene, Toluene, Ethylbenzene, and Xylene), and MTBE (Methyl-tert Butyl Ether) ' as 1,300 mg/kg, 180 7 mg/kg, and 110 mg/kg, respectively at 10 2' bg Groundwater samples were collected from monitoring wells MW-1, MW-2, and MW- ' 3 on August 30, 1996 and April 21, 1997 by Twinning I