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page 2, Chronology <br /> 4491 Durham Ferry Road <br /> 03/11/98 Wells connected to system manifold prior to start up of SVE system. <br /> 09/28/98 SVE system start up- See "Groundwater and Remediation System <br /> Operation Monitoring Report-Fourth Quarter 1998" dated 1127199. <br /> 09/30/00 SVE system shut down. <br /> 03/10/00 Confirmation soil borings., See report"Confirmation Soil Sampling, <br /> Groundwater Monitoring-First Quarter 2000, and Closure Request" <br /> dated 3127100. <br /> 08/03/00 Groundwater Monitoring Report—Third Quarter 2000 shows low levels of <br /> contamination remain in two monitoring wells. Consultant states that site <br /> has been effectively remediated to the extent practicable and the residual <br /> contaminants do not appear to pose a threat to any nearby receptors. <br /> 12/13/00 PHSIEHD concurs with consultants request <br /> within for closure.2000 foot radius of the site. <br /> nsultant <br /> requested to provide a survey of welds <br /> 12/27/00 Request for concurrence.with closure sent to Central Valley Regional <br /> Water Quality Control Board (CVRWQCB). <br /> 01/25/01 Notification from the CVRWQCB that they do not concur with the request <br />' for closure. <br /> 02/23/01 Quarterly monitoring and'sampling resumed at site, contaminant <br /> concentrations are down. <br /> 03/27/01 Meeting with PHSIEHD and CVRWQCB, agreement to conduct a couple <br /> more rounds of groundwater sampling and do trend analysis. <br /> ' 03/29/01 Notification that the county is going to begin resurfacing the street <br /> bordering the site in mid-April. <br /> 04/02/01 Quarterly monitoring and sampling event this date, contaminant <br /> concentrations still down. <br /> 04/11/01 Verbal agreement from CVRWQCB to site closure, OK to destroy the <br /> monitoring wells before the roadwork begins. <br /> 04/12/01 All on-site monitoring, soil vapor extraction, air sparge and recovery wells <br /> destroyed this date. <br /> 3 <br />