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r <br /> Chronology Page 3 <br /> 1050 Elkhorn, Stockton <br /> 7/22/99 Letter from consultant requesting delay in startup of soil vapor <br /> extraction/air sparge system until an internal combustion unit is <br /> available the end of August 1999. <br /> 7/27/99 EHD letter requiring start up of system by 9/1/99. <br /> 9/2/99 Start up of soil vapor extraction/air sparge system. <br /> 2/4/00 Date of Quarterly Report - December 1999 that discusses start up <br /> of soil vapor extraction/air sparge system. States that from 9/99 to <br /> 1/00 78.5 gallons of gas were removed. <br /> 7/26/00 Date of Quarterly Report that recommends modifying system to <br /> blower only since contaminant concentrations have declined to ' <br /> level that doesn't require destruction according to APCD permit. <br /> States that from 1/00 to 6/00 15 gallons of gas were removed. <br /> h <br /> 8/21/00 Consultant letter proposing 3 more months of soil vapor extraction <br /> using blower and confirmation boring work proposed in 8/11/97 f <br /> Remedial Action Work Plan. <br /> 10/13/00 Confirmation boring CB1 and CB2 drilled to 35 feet deep. <br /> 12/6/00 Date of Quarterly Report which includes soil results from CB1 and <br /> CB2 investigation. Reports that from 9/14/00 to 10/20/00 25 <br /> gallons of gas were removed. <br /> 2/23/01 Date of Closure Summary Report. Report states that from <br /> 11/27/00 to 1/23/01 15 gallons of gas were removed. Results of <br /> sampling six monitoring wells on 1/19/01 are in the report. <br /> h <br /> 4/24/01 EHD verbally requested additional sampling of monitoring wells, <br /> some vapor and air sparge wells, vapor sample, and additional <br /> mass balance calculation. <br /> 5/25/01 Date of Quarterly Report with additional information requested on <br /> 4/24/01 by EHD and Well Survey Report. f <br /> 6/26/01 Revised tables of soil and groundwater information submitted. <br /> f� <br /> i <br /> i <br />