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ii <br /> Chronology SITE CODE: 1988 I <br /> 1541 Charter Way <br /> Page 4 <br /> Per Chain of Custody (continued) <br /> 02!:x/90 MW2 ND ND ND ND 250 270 <br /> 02,x/90 MW1 1300 270 ND 1040 25000 2900 <br /> i <br /> 06/20/90 PHS/EHD letter - water being extraacted, treated, and disposed of <br /> I <br /> without furnishing details to PHS/EHD. <br /> Meeting at RWQCB scheduled for106-28-90 <br /> i <br /> I <br /> 06/28/90 Meeting held at RWQCB <br /> Extraction rate of water from MW-J 50 ml/min <br /> 3000 gallons extracted - volume of 'free product unknown <br /> (not measured) <br /> Water stored in a 6,000 gallon tank! on site <br /> In situ bioremediation not proper for this site - should over-excavate <br /> and remediate groundwater. <br /> 01/13/90 PHS/EHD staff met with Holt Bros. representative <br /> Soil from original tank excavation was backfilled into the excavation I <br /> because an adjacent ramp was shifting <br /> Soil from the borings and monitoring wells was bioremediated by <br /> Bio National and spread over the site. <br /> 11/14/90 PHS/EHD letter requesting a remedial action plan and quarterly <br /> d <br /> monitoring reports. <br /> it ! <br /> 01/10/91 Received letter from Water Work Corp. stating they are consultant <br /> for_Holt Bros. <br /> 01/31/91 Received quarterly report <br /> I Monitoring wells sampled <br /> ` Gradient southwest i <br /> Groundwater at 25.4 feet - 27.3 feet bgs <br /> .02 inches of free product in MW41 <br /> ' Contaminants detected in downgradient MW-5 for the first time. <br /> 'I <br /> 05/07/91 Received "Remediation Feasibility Study" from RESNA <br /> Proposed capping site and post monitoring of wells <br /> 07/23/91 RWQCB letter - Due to free product in MW-1 and movement of <br /> contaminants into MW-5 do not agree with capping and monitoring <br /> N of wells. Recommend re-excavation and vapor extraction { <br /> Also request well south of MW-2 <br /> 08/29/91 PHS/EHD letter to Holt Bros. <br /> RWQCB comments incorporated into letter <br /> Directed to select an active remediation alternative <br />