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3049 West Highway 12 <br /> Closure Chronology <br /> Page 3 <br /> . 1996 <br /> 06/21/96 PHS/EHD received the Condor Earth Technologies' report"SESOIL Modeling Results: Fate and ' <br /> Transport within the Vadose Zone"dated May 23, 1996. The report evaluated the remaining <br /> contamination and the potential to impact groundwater. The report indicated that there was the potential <br /> for EDB to impact groundwater exceeding the Maximum Contaminant Level(MCL)based on a 20 year <br /> simulation. The report also included the recommendation to pave the Pit I area to reduce water. <br /> infiltration. <br /> 07/22/96 PHS/EHD received the Condor Earth Technologies' report"Addendum, SESOIL Modeling Results:Fate <br /> and Transport within the Vadose Zone"dated July 2, 1996. The report evaluated the remaining <br /> contamination using a volatilization factor of.2, without biological degradation and modeled over a <br /> maximum time period of 100 years. Additional groundwater contamination was predicted within 12 to <br /> 45 years of toluene,ethyl benzene and xylene. The report included the recommendation to pave the Pit 1 <br /> area to'educe water infiltration and that the site be-closed. <br /> 1997 <br /> 08/28/97 The paving of the Pit i area was completed.and verified by PHS/EHD. <br /> 12/18/97 PHS/EHD recommends that the site be closed and no further remedial action required based on available <br /> information and current land use. <br />