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I Report of Findings Frontier Transportation, Inc. August 31, 2045 Page 1 ' 1.0) INTRODUCTION Biophysics Environmental Assessments, Inc (BEA)was contracted by Frontier ' Transportation, Inc to prepare a report of findings for the additional site assessment performed at 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 approved the additional site assessment on June 2, 2005 The additional site assessment was performed on August 1 and 2, 2005 and consisted of the installation of three shallow wells, MW-19, MW-20 and MW-21 2.0) SITE LOCATION ANHISTORY ' 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 Mendean 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 10 Six(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 mglkg, respectively Groundwater sample analysis identified dissolved phase TPH-d in the diesel excavation pit at a maximum concentration of ' 1,200 µg/L ' In August of 1996, Twinning Laboratories, Inc (Twinning) advanced six vertical soil borings (B-1, 13- 3, MW-IRA, MW--IRB, and MW-2RA) and one angle boring (B-4)to e �,o� depths between and +4-5'below grade surface (bgs) to assess subsurface conditions near the ' AA' northeastern excavation In addition, two hand augers(S-1 and S-2) were advanced to 3' bgs to assess subsurface conditions beneath the dispenser and product fines and three groundwater monitoring wells, MW-1 through MW-3, were drilled to approximately 25'bgs to assess the subsurface water beneath the site Initial subsurface water was encountered at 10 5' bgs Boring B-4 located northwest of the former UST's 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' bgs Groundwater samples were collected from monitoring wells MW-1, MW-2, and MW-3 on ' August 30, 1996 and April 21, 1997 by Twinning 0 I r