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I11369 NORTH HIGHV* 99 <br /> Project No 1001 <br /> August 28, 1997 <br /> Page 2 <br /> Site Description and Project History <br /> The property subject (site) is occupied by a single-story office building, several shop buildings, <br /> ] p <br /> I and three rental homes The site has been in operation as a trucking terminal since 1961, the <br /> 4,000-gallon gasohne UST was reportedly installed in the early 1970s <br />' The site is located on relatively flat lying alluvium (sand, silt, and clay) at an elevation of <br /> approximately 40 feet above sea level Ground water beneath the site is approximately 80 feet <br />' below grade The regional ground water flow direction is to the east-southeast based on <br /> review of the Lines of Equal Elevation of Ground Water, Fall 1994 Map prepared by the San <br />' Joaquin County Flood Control and Water Conservation District <br />' The former 4,000-gallon UST was located 50 feet west of the office building (Figure 2) The <br /> fuel dispenser was located adjacent to the eastern side of the UST Past inventory monitoring <br />' up to and including February 17, 1995, revealed no fuel loss from the UST Previous precision <br /> leak testing indicated the UST tested tight On February 20, 1995, a 970 gallon release of fuel <br /> was detected during inventory monitoring, the remainder of the fuel was removed from the <br />' UST the same day using a fuel recovery truck <br />' The UST was removed on March 29, 1995, by Johnson Petroleum Construction Soil samples <br /> (T1A and TIB) were collected from the bottom of the excavation by Wallace-Kuhl & <br />' Associates (WKA) Test results of the soil sample (TIB) collected from beneath the southern <br /> end of the tank at a depth of 14 5 feet revealed no detectable concentrations of petroleum <br />' hydrocarbons The soil sample (TIA) collected from beneath the northern end of the tank at a <br /> depth of 15 feet contained an elevated concentration of 1,600 mg/kg total petroleum <br />' hydrocarbons (TPH) as gasoline and elevated benzene, toluene, ethylbenzene, and xylenes <br /> (BTEX) concentrations Soil samples collected from the stockpiled soil generated during <br /> removal of the UST revealed no detectable concentrations of TPH as gasoline or BTEX A <br />' summary of analytical results is included as Table 1 <br /> 1 <br /> 1 <br /> 1 <br />