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i <br /> C <br /> 2.0 <br /> HISTORY <br /> Li WCFS was retained to provide engineering services for the removal of one 1,000-gallon diesel <br /> underground storage tank (UST) at the KJAX radio transmitter. The UST was installed in 1964 <br /> and.was removed on November 12, 1993. During the tank excavation, five soil samples were <br /> collected from beneath the tank beneath the <br /> piping, and the excavation stockpile. Inspection <br /> of the tank at the time of removal and laboratory analysis of the soil samples collected from <br /> beneath the tank indicated that soil impacted with petroleum hydrocarbons was present. <br /> r Detectable levels of total petroleum hydrocarbon as diesel were found at 9,000 ppm at at depth <br /> !a of 11.4 feet beneath the bottom of the UST (17.9 feet below ground surface). <br /> The presence of contaminants at KJAX exceed the allowable limits set forth in the State of <br /> California Tri-Regional Board Staff Recommendations and the Leaking Underground Fuel Tank <br /> L Guidelines which apply to the KJAX site. The San Joaquin County Public Health Services <br /> indicated that the UST cannot be recommended for final closure without further investigatin to <br /> determine the full extent of the soil contamination. <br /> E� <br /> i�{ h <br /> `Ge <br /> f <br /> f <br /> 8054 cA8054Ucjax.gap 2 <br />