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Third Quarter SVES Report - Ultramar #696, Lodz 10 November 1992 ' The concentration of the extracted vapors generally declined during the 3rd quarter reflecting a general trend established during previous months. On the final monitoring, only 1 of the 10 extraction wells (MW-19) indicated a significant concentration ' At the conclusion of the 3rd quarter, the SVES was operating with only MW-19 open to expedite contaminant removal from this singular "hot ' spot" on the system The hydrocarbon extraction was generally below 15 lbs/day during the ' course of the quarter. Seven extraction wells as well as ambient dilution remained closed during the entire quarter due to low concentrations. ' In anticipation of the reduced vapor levels, arrangements were made to convert the vapor abatement system from the all electric catalytic incinerator to a hopefully more cost effective approach using two ' granular activated carbon (GAC) cannisters in series. During the 3rd quarter, an application was submitted to the San Joaquin Valley Unified Air Pollution Control District (SJVUAPCD) requesting authorization to implement this modification to the vapor abatement system. On 13 July 1992, an Authority to Construct authorizing the modification was received. On 21 September, the catalytic incinerator was deactivated, thus concluding the catalytic incinerator phase of the operation The operation thereafter proceeded using the GAC abatement system. The catalytic incinerator and SVES operated in compliance with all conditions of the Permit to Operate issued for this project by the SJVUAPCD. II . INDIVIDUAL MONITORING EVENTS The following section describes how the SVES was adjusted within the performance and compliance limits of the system during each monitoring. ' 14 July 1992 Monitoring. The SVES only operated seven days since the previous monitoring on 30 ' July 1992. The system went down on 6 July due to an apparent power outage The SVES was restarted on 13 July and purged a full 24 hours prior to monitoring on 14 July ' - 2 -