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I
<br />' Report of Findings
<br /> Frontier Transportation
<br />' August 26, 2003
<br /> Page I
<br />' 1.0) INTRODUCTION
<br /> Blakely Environmental Investigations, Inc (BEI)) was contracted by Frontier
<br />' Transportation, Inc to prepare a report of findings for the additional site assessment at the
<br /> Frontier Transport facility located at 425 Larch Road, Tracy, California The San Joaquin
<br /> County Public Health Services, Environmental Health Division (PHS/EHD), Vicki McCartney,
<br />' EHS requested the additional site assessment on April 2, 2003 The additional site assessment
<br /> was performed on June 26, 2003 and consisted of the installation of MW-14
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<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
<br /> capped 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
<br />' on July 21, 1995 Soil sample analysis identified total petroleum hydrocarbons as gasoline
<br /> (TPH-g) and total petroleum hydrocarbons as diesel (TPH-d) in the gasoline tank excavation at
<br /> maximum concentrations of 9,800 mg/kg and 120 mg/kg, respectively Groundwater sample
<br />' analysis identified dissolved phase TPH-d in the diesel excavation pit at a maximum
<br /> a
<br /> concentration of 1,200 µg/L --
<br />' In August of 1996, Twinning Laboratories, Inc (Twinning) advanced six vertical soil VM
<br /> borings (B-1, B 2, 3, MW�1RA, MW 1RB, and MW 2RA) and one angle boring (B-4) to
<br /> depths between land 1�below grade (bg) to assess subsurface conditions near the
<br /> t northeastern excavation In addition, two hand augers (S-1 and S-2) were advanced to T bg to
<br /> assess subsurface conditions beneath the dispenser and product lines and three groundwater
<br />' monitoring wells, MW-1 through MW-3, were drilled to approximately 25' bg to assess the
<br /> subsurface water beneath the site Initial subsurface water was encountered at 10 5' bg Boring
<br /> B-4 located northwest of the former USTs identified maximum TPH-g, BTEX (Benzene,
<br /> Toluene, Ethylbenzene, and Xylene), and MTBE (Methyl-tert Butyl Ether) as 1,300 mg/kg, 180 7
<br /> mg/kg, and 110 mg/kg, respectively at 10 2' bg S o i Vi,
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<br />' Groundwater samples were collected from monitoring wells MW-1, MW-2, and MW-3 C'"e��V4
<br /> on August 30, 1996 and April 21, 1997 by Twinning d�
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<br /> In January of 1998, BEII advanced four(4) groundwater monitoring wells (MW-4 V
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