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215 Main, Ripon, Chronology <br /> Page 2 <br /> 10/04/01 Date CPT work was performed and 3 soil borings for water sample <br /> collection were performed. <br /> 01/04/02 Date of "Summary Report of Supplemental Subsurface <br /> Investigation" covering 9/12/01 and 10/04/01 work. Contaminants <br /> were not detected in any of the soil or water samples collected. A <br /> well survey was included in the report. <br /> 07/16/02 Conduction of a 48-hour pump test, using MW1 as the extraction <br /> well was started this date. <br /> 12/12/02 Date of"Feasibility Study Report" covering 7/16/02 work. Report <br /> recommends preparing a Corrective Action Plan that will consider <br /> bioattenuation, groundwater extraction and air sparge methods. <br /> 01/24/03 Date of EHD letter requesting further investigation on groundwater <br /> extraction from existing monitoring wells prior to installation of an <br /> extraction well. <br /> 05/07/03 Date of "Letter Workplan for interim Remediation" proposing to <br /> perform 10 biweekly groundwater extraction events lasting up to 18 <br /> hours. <br /> 07/08/03 Date of first biweekly groundwater extraction event. <br /> 07/09/03 Date of EHD letter approving interim groundwater extraction <br /> events. <br /> 05/03/04 Date of "Interim Remedial Action and Groundwater Monitoring <br /> Report" covering eleven groundwater extraction and recommends <br /> site closure. <br /> 06/16/04 EHD and Regional Board discussed closure of this site. <br /> 07/01/04 Date of EHD letter requesting a no further action required report. <br /> 10/18/04 Date of "Closure Report" for the site. <br /> 12/29/04 Date of EHD letter requesting an addendum to the closure report <br /> that uses a degradation rate to estimate when the groundwater will <br /> meet water quality objectives. <br /> 07/08/05 Date of"Second Quarter 2005 and Closer Addendum" report that <br /> has degradation rates. <br />