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I <br /> Page 2 <br /> Chronology <br /> 24500 MacArthur Drive, Tracy <br /> 7/13-28/98 Excavation of 1522 cubic yards of contaminated soil. Soil to be <br /> aerated on site. Excavation filled with clean material. Pot holes dug <br /> to define the lateral & vertical extent of contamination because all <br /> contaminated soil could not be removed. <br /> 09/2/98 AGS "Report For Remedial Soil Excavation and On Site Aeration" <br /> documents work performed in July 1998. <br /> 09/17/98 AGS supervised installation of MW1A near the former tank location, <br /> to replace MW1 destroyed prior to excavating. <br /> 10/28/98 AGS report on Soil Aeration. Analytical data indicated soil can be <br /> left spread on the site. <br /> 11/20/98 PHS/EHD letter approving soil be left where it had been placed on <br /> site. <br /> 09/07/99 AGS "Case Closure Request Report" showing contaminant levels <br /> reduced. <br /> 11/18/99 AGS addendum to closure request containing well survey, revised <br /> site map, and tables of soil analytical data. <br />