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20061 `Quarter Groundwater Report <br /> Frontier Transportation,Inc. <br />' April 28, 2006 <br /> Page 1 <br />' 1-0) INTRODUCTION <br />' Biophysics Environmental Assessments, Inc (BEA) was contracted by Frontier <br /> Transportation, Inc to report the 2006 first quarter groundwater monitoring results at the <br /> Frontier Transport facility, 425 Larch Road, Tracy, California(See Figure 1, Site Location Map) <br />' The 2006 first quarter groundwater momtonng episode was performed on March 31, 2006 by <br /> Del-Tech Geotechnical Support Services The San Joaquin County Public Health Services, <br /> Environmental Health Division(PHS/EHD), Carrol Oz, Senior REHS 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 capped <br /> by cement and/or asphalt The site is located in an industrial park <br /> Six 6) underground fuel storage tanks (UST <br /> s), three diesel tanks located northeast of the <br /> terminal and three gasoline tanks located southeast of the terminal, were removed from the site on <br /> July 21, 1995 Soil sample analysis identified total petroleum hydrocarbons as gasoline (TPH-g) <br /> and total petroleum hydrocarbons as diesel (TPH-d) in the gasohne tank excavation at maximum <br /> concentrations of 9,800 mg/kg and 120 mg/kg, respectively Groundwater sample analysis <br /> identified dissolved phase TPH-d in the diesel excavation pit at a maximum concentration of <br /> 1,200 pg/L <br /> IIn August of 1996, Twinning Laboratories, Inc (Twinning) advanced six vertical soil <br /> bonngs (B-1, B-2 B-3, MW-IRA, MW-IRB, and MW-2RA) and one angle boring (B-4)to <br /> depths between W' ' and IP5' below grade surface (bgs) to assess subsurface conditions near <br /> the northeastern excavation In <br /> tion, two hand augers (S-I <br /> to assess subsurface conditions beneath the dispenser and product li bgs <br /> es and three groundwater <br /> Imonitoring 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 /> f <br />