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t <br /> Chronology <br /> 10 Grant Line, Tracy <br /> Page 2. <br /> 05/17/00 EHD letter directing that at least one monitoring well be installed <br /> near B3. <br /> 06/21/00 Date of work plan for installation of one monitoring well. <br /> 07/07/00 Date of "Quarterly Monitoring Approach". Consultant to obtain <br /> access to UST sites down gradient and across the street from this <br /> site for groundwater contouring. <br /> 07/18/00 EHD approval of 6121100 work plan'and 717100 monitoring <br /> approach. <br /> 9113100 MW1 installed down gradient of former UST area with screen <br /> interval from 8 to 20 feet ibsg. <br /> 11/24/00 Date of"Groundwater Monitoring Well Installation" report. Well <br /> sampled 9121100 only contaminant evidenced was TPH-gas at 230 <br /> ppb. <br /> 12/27/00 EHD letter directing another water sampling event and that if <br /> sample results are similar to first sampling results a closure report <br /> should be prepared. <br /> 02/08/01 Date of "Groundwater WL-11 Monitoring" report. Results of 12/21/00 <br /> groundwater sample non-detect. <br /> 04/27/01 Date of "Groundwater Monitoring Well Monitoring'!, report. Results <br /> of 3129101 groundwater sample non-detect. <br /> 05/09/01 Date of"Request for Site Closure Report" includes well survey. <br /> 05/21/01 Letter from consultant who recalculated mass balances. <br /> 06/15/01 Letter from consultant with another.recalculation of mass balances. <br /> 7117101 EHD concurrence with closure request. <br />