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CHRONOLOGY I� <br /> 30836 Airport Way <br /> Site Code : 2419 lE <br /> F <br /> 10/20/89 Two USTs removed under permitj,and inspection <br /> by PHS/EHD. Soil contamination discovered in i <br /> samples collected under piping. <br /> J� <br /> 12/08/89 Overexcavation of contaminated soil began. <br /> Approximately 3 , 500 cubic yards of material <br /> removed for on site aeration. ':.'i <br /> 04/04/90 Overexcavation continued until Kasson Rd. was <br /> limiting factor on the west and until the on <br /> site store building on the south became <br /> limiting. Confirmation soil sample's collected <br /> in the excavation revealed gasoline residuals <br /> on the west and south sides . 'Further <br /> characterization was required' <br /> IiF 1 <br /> 11/12/96 Further site characterization performed <br /> utilizing DPT/Geoprobe technique . ,' Soil <br /> samples collected from six lodations and <br /> groundwater samples from to of the six. Soil <br /> under the store building contained the y <br /> highest concentration of gasoline: AGES <br /> sample P5-20 {TPH 110 ppm, Benzene 0 . 015 <br /> if PPM) . The two groundwater samples were ND <br /> for gasoline and MTBE. <br /> 09/19/97 EHD reviewed AGES report dated April 30 , 1997 <br /> and concurs with the request for closure with <br /> no further action. <br /> 09/25/97 EHD completed case closure summary and <br /> prepared 30 day closure concurrence letter <br /> IIC` for CVRWQCB . } <br /> CHRONSJR <br /> h <br /> li i 1 <br /> 3 <br /> 1t •F <br />