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r <br /> Chronology page 3 <br /> 110 N. Filbert Street, Stockton <br /> 04/09/08 Date of the EHD correspondence commenting on the CUF recommendation for <br /> closure with reasons for denial and items that need to be addressed before it can <br /> agree to no further action. <br /> 12/00/08 EHD approves SVE/IAS shut down due to decreased effectiveness. Site <br /> prepares for closure. <br /> 01/09/09 Date the EHD approves The Source Group's Corrective Action Plan Addendum <br /> dated December 19, 2008 that requests shut down of the offsite ozone sparge <br /> system due to gradient change. <br /> 02/02/09 Date of the EHD correspondence that approves The Source Group's Site <br /> Investigation Work Plan dated January 15, 2009. The plan is to install additional <br /> onsite monitoring wells to collect data to support residual mass and groundwater <br /> contaminant plume extent to the east/southeast conclusions previously submitted <br /> to the EHD. <br /> 03/09/09 SWRCB-CUF's 5-year review 2009 evaluation recommends site closure. <br /> 04/14/09 Date of the EHD response letter to the SWRCB-CUF's 2009 5-year review letter. <br /> The EHD reiterates its concerns that several significant items needed for closure <br /> have not been adequately addressed. <br /> 05/05/09 Date of the SWRCB-CUF revised 5-year evaluation that concurs with the EHD <br /> that additional delineation of the groundwater plume is required. The CUF <br /> proposes to review the site again in six months. <br /> 07/08/09 Date of the EHD correspondence to reduce quarterly groundwater sampling to <br /> comply with State Resolution 09-0042. <br /> 10/12/09 The Source Group's October 7, 2009 Request for Closure reviewed. The EHD <br /> initially concurs and schedules discussion with the CVRWQCB. <br /> 10/20/09 Site discussed with representative of the CVRWQCB in preparation for no further <br /> action status. Mr. James Barton concurs with the EHD's conclusions and <br /> requests additional requirements. <br /> 10/29/09 Fourth sampling event conducted for new wells to meet one of the closure <br /> evaluation requirements. <br /> 12/10/09 Revised Request for Closure received on Geotracker. <br /> 02/19/10 Case closure summary and chronology completed. <br />