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Chronology Page 2 <br /> 1050 Elkhorn, Stockton <br /> 1/19/96 Date of work plan addendum proposing installation of two dual soil <br /> vapor extraction /air sparge wells and conducting a feasibility test <br /> for air sparging and vapor extraction. <br /> 1/26/96 VW/IAS-1 and VW/IAS-2 installed. <br /> 6/27/96 Date of Quarterly Report and Corrective Action Plan that includes <br /> installation of VW 1 and VW2 which are dual completed vapor <br /> extraction/air sparge wells. Air sparge wells screen slot is from 45 <br /> to 50 feet. VW 1 screen is 15 to 35 feet and VW2 screen is from 20 <br /> to 35 feet. Report recommends soil vapor extraction and air <br /> sparging. <br /> 8/17/96 EHD letter requesting a work plan with remediation system details. <br /> 8/21/96 SWRCB Cleanup Fund letter that risk analysis should be <br /> performed prior to soil vapor extraction remediation. <br /> 11/5/96 EHD review of groundwater sample results and decision to observe <br /> contaminant trends before deciding on further remedial action <br /> required. <br /> 7/31/97 EHD verbally requested Remedial Action work plan since <br /> monitoring well 2 groundwater sample results showed higher <br /> contaminant concentrations. <br /> 8/11/97 Date of Remedial Action Work Plan. <br /> 10/13/97 EHD verbally requested more details on work proposed in 8/11/97 <br /> work plan. <br /> 10/14/97 Dated of Remedial Action Work Plan Addendum. <br /> 10/16/97 EHD letter recommending proceeding with installation of vapor <br /> extraction/air sparge system. <br /> 7/30-31/98 3 vapor extraction and 3 air sparge wells installed. <br /> 10/30/98 Date of Report of Quarterly Monitoring that includes information on <br /> July 1998 work. VW3 and VW4 screen from 25 to 35 feet. VW5 <br /> was an angle boring in the former UST area with screen from 15 to <br /> 35 feet. IAS 3, IAS4, and IAS5 screen from 39 to 44 feet. <br />