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2004 1" Quarter Groundwater Report <br /> • Frontier Transportation <br /> I May 20, 2004 <br /> Page 1 MAY 2 4 2004 <br /> ENVIRONMENT HEALTH <br />' 1.0) INTRODUCTION PERMIT/SERVICES <br /> Blakely Environmental Investigations, Inc (BEIM was contracted by Frontier <br /> Transportation, Inc to report the 2004 first quarter groundwater monitoring results at the Frontier <br /> Transport facility, 425 Larch Road, Tracy, California(See Figure 1, Site Location Map) The <br /> 2004 first quarter groundwater monitoring episode was performed on March 24, 2004 The San <br /> Joaquin County Public Health Services;Environmental Health Division (PHS9EHD), Carrol Oz, <br /> Senior REHS requested quarterly groundwater monitoring on September 8, 1999 <br /> I2.0) SITE LOCATION AND HISTORY <br /> The site is located in Tracy, California at 425 Larch Road in the northwest quarter of <br /> I 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 /> ISix (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 /> concentration of 1,200 pg/L <br />' In August of 1996, Twinning Laboratories, Inc (Twinning) advanced six vertical soil <br /> a <br /> borings (B-1, B-2, , MWI(IRA, MW-IRB, and MW-2RA) and one angle boring (B-4) to <br /> depths between and 12-;5' below grade surface (bgs) to assess subsurface conditions near <br />' 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 <br />' In January of 1998, BEII advanced four (4) groundwater monitoring wells (MW-4 <br />