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Third Quarter SVES Report - Ultramar #696, Lodi <br /> 10 November 1992 <br /> i <br /> 13 August 1992 Monitoring: <br /> ' The system operated until 11 August at which time it went down due to <br /> yet another construction related power outage The unit was restarted <br /> on 13 August and purged several hours prior to monitoring. <br /> The system was again stable and no required adjusting. <br /> concentration increased slightly, 9 3 ting• The influent <br /> the daily extraction rate increasingtoly e12 nlb /day part o rebound, with <br /> I <br /> The laboratory analysis of another verification sample of vapors <br /> extracted from MW-19 indicated another slight decline to 620 ppm <br /> 25 August 1992 Monitoring: <br /> The SVES operated continuously without interruption since the previous <br /> monitoring. Vapor concentrations again generally declined with 7 of <br /> the 10 extraction wells indicating non-detect (<Ippm) vapor levels. <br /> The system continued to operate with only 3 extraction wells open. It <br /> was not necessary to change any well valve positions on this date <br /> The vacuum increased to a program high 9 5" hg, meaning that the soils <br /> were being subjected to the highest vacuum feasible. The recirculation <br /> valve was opened slightly to prevent the drive motor from over-amping <br /> at this level of vacuum. <br /> Although the influent concentration decreased slightly, this was <br /> compensated by a corresponding increase in the flowrate, leaving the <br /> ' extraction rate relatively unchanged at about 11 lbs/day. Ambient <br /> dilution remained closed. <br /> 9 September 1992 Monitoring <br />' The SVES operated less than a day followingth <br /> It was restarted 8 September and e previous monitoring. <br /> p <br /> monitoring on this datepurged a full 24 hours prior to <br /> I <br /> Vapor concentrations remained low at most extraction wells. Wells <br /> MW--20 and MW--34, which previously had always been left open to contain <br /> migration, were closed for the first time. <br /> The SVES was left operating on the single remaining "hot" well MW-19 to <br />' maximize contaminant removal prior to converting the abatement system <br /> to GAC. The vapor concentration increased significantly at MW-19 as a <br /> result of the high vacuum and flowrate being focused on this single <br />' well It was expected that this increase would only be temporary. <br />' - 4 - <br />