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17 April 2006 AGE-NC Project No. 04-1207 Page 7 of 9 extraction system,the VACLEEN 1000G,manufactured by Environmental Techniques.This vapor extraction system consists of a positive-displacement blower driven by an internal combustion(IC) engine. The inlet of the system will be connected to the newly-installed SVE well. Air-tight well caps fitted with attached Magnehelic vacuum gauges will be attached to the surrounding monitoring wells and the induced vacuum will be measured at these monitoring points.The air stream from the SVE well will be monitored for the presence of organic vapor using an organic vapor analyzer (OVA)equipped with a PID.The vacuum applied to the extraction well will cause hydrocarbons in the soil to volatilize and flow through the vacuum pump to the IC engine.The extracted hydrocarbon vapor will be destroyed in the IC engine as part of its internal combustion process.Emissions from the engine will be routed through two catalytic converters to maximize the destruction of hydrocarbon vapor. 4.2.2. Field Measurements During the vapor extraction pilot test,air flow will be monitored using a Dwyer DS-200 flow sensor. Flow rates will be measured and documented in inches of water of differential pressure. The flow rate, documented as standard cubic feet per minute (scfm), will be determined from the measured differential pressure and the piping diameter using a nomograph.Induced vacuum measurements will be recorded from the surrounding monitoring wells utilizing Magnehelic gauges. The induced vacuum will be monitored for a stabilized value in inches of water during the pilot test.Hydrocarbon concentrations in the well effluent stream will be measured at regular intervals. A PID will be utilized for field measurements. 4.2.3. Collection and Analysis of Vapor Samples A total of four vapor samples will be collected at 2-hour intervals from the inlet of the extraction well to measure concentrations of extracted hydrocarbon vapor. The samples will be collected in Tedlar bags using the organic vapor analyzer as an air pump. Following sample collection, the samples will be placed in a covered container and transported under chain of custody to a DHS- certified analytical laboratory for analysis. Each sample will be analyzed within 72 hours for the following costituents: • TPH-g in accordance with EPA Method 8015 Modified/5030; • BTEX and the fuel additives TBA, DIPE, ETBE, TAME, MTBE, 1,2-DCA, and EDB in accordance with EPA Method 8260B. Advanced GeoEnvironmental,Inc.