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30 September 2005 AGE-NC Project No. 97-0343 Page 6 of 6 3.3.1. Soil Vapor Extraction Monitoring During the "start-up" period for the SVE system, organic vapor samples will be collected and operational parameters will be monitored on a daily basis. The anticipated start-up period will be approximately one week. Following the start-up period,the vapor extraction system will be monitored weekly using an OVA and Dwyer DS-200 flow sensor to ensure optimal destruction of recovered hydrocarbon vapors,and to monitor cleanup progress. The OVA readings will be taken and recorded from the influent end h of the vacuum blower unit and the effluent end of carbons vessels.Operational parameters(air flow, air vacuum and volume of processed vapor) will be measured on a weekly basis to monitor and record soil-gas volumes extracted and operational efficiency. Vapor samples will be collected on a monthly basis from the influent and effluent end of the vapor extraction system utilizing the vacuum pump on an OVA. The samples will be collected in Tedlar bags and transported to a DHS-certified laboratory in a chilled container under ice and under chain of custody. Induced vacuum will be measured utilizing a Magnehelic vacuum gauge attached to the inlet and outlet of the vapor extraction system; SVE air flow will be monitored using a Dwyer DS-200 flow sensor. The SVE air flow along the influent and effluent-lines will be monitored weekly for the presence of organic vapor using an OVA. Sampling ports will be installed upstream of the vacuum blower inlet to recover SVE influent air flow vapor stream samples,and downstream of the carbons vessels to recover effluent SVE air flow samples to monitor the efficiency of hydrocarbon destruction. 3.3.2. Soil Vapor Extraction System Maintenance The SVE system will be maintained on a weekly basis, according to manufacturers recommendations. After stabilization, routine maintenance would represent the only periods of "down time"for the unit. One to two times each month(assuming 24-hour operation),the unit will be shut down for routine maintenance procedures such as oil/filter changing, GAC media replacement and maintenance/system inspections and adjustments. Advanced GeoEnvironmental,Inc.