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i <br /> x . <br /> 500 East Grant Line Road <br /> Chronology Page 508/04/97 , <br /> 12-04-92 PHS/EHD witnessed groundwater sampling of AW7 and AW4. <br /> 1993 <br /> 01-08-93 Sequoia Analytical concluded that the samples which did not normally contain diesel though which <br /> was reported to contain diesel, were reported positive because a series of isolated peaks were <br /> identified. i <br /> 01-28-93 PHS/EHD correspondence requested consideration for the use of Method 8270 to identify isolated <br /> peaks. <br /> 03-19-93 Alton correspondence included'a permit application. j <br /> 03-23-93 PHS/EHD received the"Risk Assessment Work Plan"dated March 22, 1993 by fax. Issued permit# <br /> 93-0476 for the installation of three on site monitoring wells AW10-AW 12. <br /> 03-25-93 PHS/EHD inspection of the installation of AW10-AW12. Finaled permit#93-0476. Contamination <br /> was noted. <br /> 04-02-93 PHS/EHD received the hard copy of the "Risk Assessment Work Plan". PHS/EHD performed a site <br /> inspection to witness groundwater monitoring. <br /> 04-08-93. PHS/EHD correspondence commented on the "Risk Assessment Work Plan" PHS/EHD stated that <br /> since groundwater quality .has already been impacted risk assessments based on health based <br /> methodology have limited',application. PHS/EHD requested that the proposed risk assessment and <br /> FRP be submitted by June 30, 1993. i <br /> I <br /> Office meeting with Jeff Scharff,Jan Greben and Greg Schubert representing Tracy Venture. <br /> 05-27-93 PHS/EHD performed a site inspection to witness groundwater sample collection and splits with <br /> Geomatrix. <br /> I <br /> i <br /> 1 <br />