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<br /> • 2005 2ndQuarter Groundwater Report
<br />' Frontier Transportation, Inc.
<br /> August 5, 2005
<br /> Page 1
<br />' 1.0) INTRODUCTION
<br /> Biophysics Environmental Assessments, Inc (BEA) was contracted by Frontier
<br /> tTransportation, Inc to report the 2005 second quarter groundwater monitoring results at the
<br /> Frontier Transport facility, 425 Larch Road, Tracy, California (See Figure 1, Site Location Map)
<br /> The 2005 second quarter groundwater monitoring episode was performed on June 20, 2005 by
<br />' Del-Tech Geotechnical Support Services The San Joaquin County Public Health Services,
<br /> Environmental Health Division (PHS/EHD), Carrol Oz, Senior RENS requested quarterly
<br />' groundwater monitoring on September 8, 1999
<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 />' M (TPH-g) and total petroleum hydrocarbons as diesel (TPH-d) in the gasoline tank excavation at Y
<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 />' concentration of 1,200 µg/L
<br />' In August of 1996, Twinning Laboratories, Inc (Twinning) advanced six vertical soil
<br /> borings (B-1, B-2 B--3, M 1RA, MW-IRB, and MW-2RA) and one angle boring (B-4) to
<br /> �w depths between a- ' and ,7, '"below grade surface (bgs) to assess subsurface conditions near
<br />' aAA� the northeastern excavation In addition,two hand augers (S-1 and S-2) were advanced to 3' bgs
<br /> to 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' bgs to assess the
<br />' subsurface water beneath the site Initial subsurface water was encountered at 10 5' bgs 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' bgs
<br /> Groundwater samples were collected from monitoring wells MW-1, MW-2, and MW-3
<br />' on August 30, 1996 and April 21, 1997 by Twinning Results are presented in Table 1
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