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TABLE 1 i4 <br /> POTENTIAL OFFSITE SOURCE AREAS <br /> • 541 West Grant Line Road <br /> Tracy, California <br /> ' Maximum Concentrations <br /> Depth to <br /> ' Groundwater,Flow <br /> Direction and <br /> No Name and Address Potential Contaminant Sources Shallow Soil Type Gradient Sod(Rpm) Groundwater(ppb) Remediation/Status Concerns <br /> I <br /> According to a 10 April 2003 letter from <br /> SJCEHD, the site has been out of <br /> ' TPH-gas-ND During an investigation to upgrade the USi ,borings were compliance for over 2 years Agency <br /> TPH-diesel-I 1 TPH-gas-2,000 drilled and contammation found in the soil and directives are to perform quarterly <br /> MTBE-940 groundwater An UST Unauthorized Rel Base Leak monitoring and assess the offsite extent <br /> California Highway Patrol one former gasoline UST(size 4 5-6 feet b s MTBE-0 250 g � (Leak) <br /> ' 8 No data available g benzene-ND benzene-20 Report was filed on 26 April 1999 The LUST was of the contaminant plume <br /> 385 W Grant Line Road unknown) N-NW@0 004 ethylbenzene-19 removed in May 2000 and an unspecified 1 quantity of soil In the 1999 investigation, soil samples <br /> ethylbenzene-ND Y p q ty <br /> toluene-ND toluene-8 2 was overexcavated and removed Three wells have been had low levels of contaminants detected, <br /> xylenes-0 088 xylenes-275 installed and minimal groundwater monnto g has been but were collected at depths(10 and 25 ft <br /> conducted bgs)well below the top of groundwater <br /> where floating or dissolved product <br /> would be found <br /> 1 <br /> I Groundwater contamination was detected subsequent to a <br /> Former Shell Station failed tank precision test in 1986 USTs abandoned in 1988 Groundwater flow direction in late 1980s <br /> ' • 9 7-11 Store 3 former(unknown size}gasoline 5 feet bgs and removed in 1989 At least 15 monitoring wells determined to be toward northeast <br /> ( ) USTs and pump island/piping Na data available NE No data available No data available � g <br /> 455 W Grant Line road installed and a feasibility study and remediation plan Significant portions of SJCEHD files <br /> ' prepared Vapor study was performed to e'aluate human missing health risk in 1988 Status of site unknown <br /> Acronyms- <br /> ppb=parts per billion <br /> ' ppm=parts per million <br /> cuyds=cubic yards <br /> ' ND=Not detected ; <br /> NT=Not tested , <br /> TPH=Total petroleum hydrocarbons <br /> O&G=Oil&Grease <br /> ' mo=motor oil <br /> MTBE=Methyl tertiary butyl ether <br /> 1,2-DCA= 1,2 Dichloroethane <br /> 1 Touchstone Developments, 1994a&b, Groundwater Technology, 1995,Chevron, 1995, Secor 2001 &2002 <br /> 2 Lynch,2003 <br /> 3 Pratt,2003 <br /> 4 SJC, 1996& 1999 <br /> 5 KE, 1986a&b, 1987, 1988,Alton Geoscience, 1992,AEG, 1995 <br /> 6 ASE 1998,2000,2002a,b&c <br /> 7 SETC, 1996, GeoEnvirorimental, 1997,SJCEHD, 1997 RWQCB, 1997 0 <br /> . 8 URS, 2000a&b, SJCEHD,2003 <br /> ' 9 HLA, 1988&1991, SJCEHD, 1988,The Southland Corporation, 1991 <br /> Potential Source Areas x1s <br /> TREADWELL&ROLLO,INC <br /> 3 of 3 <br /> 5121/03 <br />