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Fj <br /> 2.0 Project History <br /> An Initial Site Assessment was completed for the Trac Maintenance Station (Geocon, 2001) <br /> k <br /> and included a site history. In April 1988, one waste oil underground storage tank(UST) was <br /> removed from the site.No further documentation regarding the waste oil UST removal activities <br /> was available. In September 1996, one steel 7,600-liter (2,000-gallon) gasoline UST and one <br /> steel 7,600-liter (2,000-gallon) diesel fuel UST were re oved from the site. The USTs were <br /> freportedly in good condition and stains or holes were not noted. Laboratory results indicated that <br /> total petroleum hydrocarbons as gasoline (TPHg), bent ne, toluene, ethylbenzene,total xylenes <br /> (BTEX) and methyl tert-butyl ether (MTBE) were not etected in soil samples collected from the <br /> F . <br /> bottom of the former gasoline UST excavation. Total petroleum hydrocarbons as diesel (TPHd) <br /> �— was not detected in soil samples collected from the bottom of the former diesel UST excavation. <br /> Total lead concentrations ranging from 1.5 to 9.2 milligrams per kilogram (mg/kg) were detected <br /> in soil samples collected from the former gasoline UST excavation. Groundwater was <br /> encountered at approximately 3.3 m (11 feet)below ground surface (BGS) during UST removal <br /> activities. TPHg, TPHd, BTEX, and total lead were not detected in a grab groundwater sample <br /> r collected from the excavation. MTBE was detected in a grab groundwater sample at a <br /> 1 1 <br /> concentration of 31 micrograms per liter (µg/1). The reported presence of MTBE was based on <br /> EPA Test Method 8020 data and may represent a false ositive. The San Joaquin County <br /> Environmental Health Division (SJCEHD) issued a 'nc further action' letter in January 1997 <br /> (misdated January 3, 1996) for the fuel UST removals. The SJCEHD issued a `no further action' <br /> letter dated January 3, 1996 (sic 1997). <br /> F: <br /> F <br /> F <br /> -14&AGRFPflCOMMOffiswD ?OOMR,MJMMg35444.2ab.0c <br /> 2-1 <br />