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� rl 25 July 2008 AGE-NC Project No. 99-0682 Page 6 of 6 I+ petroleum hydrocarbon vapors extracted from these wells will be sequentially routed through a 100-gallon steel condensation entrapment chamber and a vacuum blower before entering a oxidizer chamber for final destruction. A diagram of a typical system is illustrated on Figure 6 . Induced vacuum measurements will be collected utilizing aMagnehelic vacuum gauge attached near the inlet of the blower; SVE air flow will be monitored for each well at the extraction manifold and near the inlet of the blower using Dwyer DS-200 flow sensors. Following the start-up period, the SVE air flow at the extraction manifold and along the influent and effluent lines will be monitored j weekly for the presence of organic vapor using an organic vapor analyzer (OVA) equipped with a photo-ionization detector (PID : Thermo Environmental 580; 10.0 cV; calibrated to isobutylene). Sampling ports will be installed upstream of the vacuum blower inlet to recover SVE influent air- flow vapor stream samples, and downstream of the thermal oxidizer to recover effluent SVE soil vapor samples to monitor the efficiency of hydrocarbon destruction. 3 .3 . 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 a PID and Dwyer DS-200 flow sensors to ensure optimal destruction of recovered hydrocarbon vapors and to monitor cleanup progress. The PID readings will be taken and recorded from the influent end of the vacuum blower unit and the effluent end of the thermal oxidizer. In addition, PID readings may be recorded for each SVE well from the sampling ports at the extraction manifold to determine the ro efficiency of each SVE well. Operational parameters (air flow, air vacuum, and volume ofprocessed vapor) will be measured on a weekly basis to monitor and record soil-vapor 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 an electric vacuum pump . Samples will be collected into Tedlar bags and 3 transported under chain of custody to a CDPH-certified laboratory and analyzed for TPH-g, BTEX, and MTBE. The SVE unit is anticipated to operate on the site for six months; an evaluation of the cost effectiveness will be conducted after this period of operation. ; r� A Advanced GeoEnvironmental, Inc.