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.... 07 June 2002 AGE-NC Project No. 99-0645 Page 4 of 9 3.4. SOIL VAPOR EXTRACTION SYSTEM START-UP PERIOD After installation of the SVE system, AGE will initiate a start-up period(first week of operation) in which operational parameters(air flow_combustion temperature.volume of processed vapor,oxygen level and the lower explosive limits (%LEL) will be monitored daily. To ensure optimal destruction of recovered hydrocarbon vapors during the SVE start-up period, vapor samples will be collected on a daily basis from the influent and effluent ends of the VES and submitted to a California Department of Health Services (DHS)-certified laboratory for analysis for: • Total petroleum hydrocarbons quantified as gasoline (TPH--g) in accordance with EPA Method 8015 Modified and • Volatile aromatics(benzene,toluene,ethyl benzene and xylenes: BTEX)and methyl tent-butyl ether (MTBE) in accordance with EPA Method 8020. Laboratory reports for vapor analysis, testing methods, laboratory quality assurance/quality control (QA/QC) reports, and sample chain of custody documentation will be presented in monthly reports 3.5. OPERATION, MONITORING AND MAINTENANCE ACTIVITIES In order to maximize the efficiency of the clean-up effort, a 24-hour/day operation of the system is planned. A typical destruction rate of greater than 95%of hydrocarbon vapors is expected throughout the entire cleanup duration. After the initial start-up period,vapor influent and effluent concentrations and operational parameters will be monitored on a weekly basis to ensure optimal destruction of recovered hydrocarbon vapors and to monitor cleanup progress. In addition, the SVE system will be maintained on a weekly basis according to manufacturers recommendations (i.e lubrication, oil changing, system adjustments, etc.). Vapor samples from the influent and effluent ends of the VES will be collected on a monthly basis and submitted to a DHS-certified laboratory for analysis of the following constituents: • TPH-g in accordance with EPA ':Method 8015 Modified and • BTEX and MTBE in accordance with EPA Method 8020. Quarterly ground water monitoring and sampling will be performed at the site ( MW-1 through MW-3) throughout the interim remediation period to monitor remedial progress. Depth to ground water and dissolved oxygen measurements will be collected on a monthly basis to deterrnine i(ground water mounding is occurring as a result of the SVE system. Idvaneed Geo Environmental,Inc.