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i <br /> p <br /> Chronology <br /> 7505 Linne Road, Tracy <br /> Page 2 <br /> 03/17/97 <br /> Date of"Remedial Action Work Plan" which describes the <br /> installation and operation of a vapor extraction system. <br /> 03/21/97 EHD approved the 3117197 plan. <br /> 02/25/98 Start up of the vapor extraction system. <br /> 01/04/99 Date of Quarterly Report recommending continued operation of the <br /> vapor extraction system and soil investigation to assess the <br /> effectiveness of the system. <br /> 02/11/99 Two confirmation borings drilled at the site. A groundwater sample <br /> was collected from one of the borings. <br /> 04/23/99 Date of"Corrective Action Status Report" which has results of <br /> 2111199 work. Data shows the hydrocarbon contamination was <br /> significantly reduced in the soil but MTBE was found in the <br /> groundwater. Report recommends installation of monitoring wells. <br /> 04/23/99 Date of work plan for installation of monitoring wells. <br /> 08124199- Installation of three functional monitoring wells_ <br /> 03/13/00 <br /> 04/17/00 Date of Quarterly Report that contains information on installation of <br /> the monitoring'wells. MTBE in the groundwater sample from MW1. <br /> MW3 not installed during period report covers. <br /> 07/10/00 Date of Quarterly Report Second Quarter 2000. MTBE found in <br /> groundwater samples from MW1 And MW3. Also, this is the date <br /> of Well Receptor Survey. There are three drinking water wells on <br /> the site. <br /> i` 11/09/00 EHD letter requesting a work plan to define the lateral and vertical <br /> extent of the groundwater contamination and destruction of one of <br /> the drinking water wells. <br /> 12/20/00 Date of"Work Plan for Additional Well Installation" which includes <br /> destruction of the drinking water well. <br />} <br /> 6/11-12/01 Installation of MW4, MW5, MW6. <br />