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1 i San Joaquin County EHD September 5, 2008 Page 6 of 10 Off-gas treatment will be via combustion in the IC engine and the catalytic converters. Two effluent samples (one from each VEW) will be collected at the close of each test in order to verify destruction efficiency. Effluent samples will be analyzed by Air Toxics for TPHg, BTEX compounds and MTBE by EPA Method TO-3. Vapor Extraction Pilot Test Procedure I. Connect vapor extraction manifold to vapor extraction well (VEW1) and connect Magnehelic® gauges to the associated observation wells used to measure vacuum response (See Table 1). 2. The IC will be ramped up to between 65 and 75 inches of water column and between 100 and 110 cfm. Blaes Environmental was able to measure a ROI of nearly 60 feet at similar vacuum and flow rates (Blaes, 2007). 3. PID, vacuum, flow, and dilution air readings will be taken every 30 minutes for three hours. An influent air sample will be collected into a uniquely labeled Tedlar® bag 15 minutes after achieving a flow of 100 cfm or greater and just prior to ending the pilot test on VEWL An effluent sample will be collected with the last influent sample to determine destruction rates. The air samples will be submitted to Air Toxics Limited of Folsom, California for analysis. 4. After three hours Del-Tech will connect the vapor extraction manifold to vapor extraction well VEW2 and connect Magnehelic® gauges to the associated observation wells used to measure vacuum response (See Table 2). Steps 2 and 3 will be repeated on VEW2. 5. After the SVE pilot test is complete Del-Tech will re-connect the vapor extraction manifold to VEW1 in preparation of the helium tracer test discussed below. The SVE system will not operate until required by the helium tracer test. Air Sparging The air sparging equipment will consist of an air compressor, distribution valve for injecting helium, flow meters (helium and air), pressure gauges (helium and air), and a vent valve to regulate pressure and flow rates (manifold system). The vent valve will be open to begin the pilot test and closed slowly while monitoring the increase in pressure and flow rate. Care will be taken not to exceed upper pressure limits of the system. The pressure to the air sparging well will be sufficient to overcome the head pressure of the overlying water column and the capillary pressure of the overlying stratum. The airflow rates will be as high as possible to determine the maximum radius of influence obtainable. The EPA i G:\GROUNDZE\I-IARRYS AUTO\Reports\Workplans\wp sve pilot test.doc I i