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Report—Vapor Extraction/Air Sparge Remedial System Page 7 Former Bank of Stockton 1 Western Lift Site Project No. 102.3 March 25, 2005 4.0 SYSTEM INSTALLATION & OPERATION The surface equipment for the system was newly constructed for this site, and connected to service wells with buried pipe runs. This work occurred from May to September 2004. The surface equipment is electrically actuated and the previously installed 240-volt, 3- phase, service was upgraded from the one constructed for the pilot test to provide an adequate power source. ' 4.1 Trenching and Piping Haley Construction of Stockton, CA was contracted to install conveyance piping in trenches to protect it from continual truck and forklift traffic associated with ongoing business operations of Cutter Lumber Products. Upon completion of trenching, the vapor extraction wells were connected to the central equipment area with 3 inch diameter schedule 40 PVC piping, and the sparge wells were constructed with L5 inch schedule 40 PVC piping. Each wellhead was equipped with a "T" fitting to allow direct access to the wells and a traffic-rated well box. This fitting allows for entry of each well for sounding, ' development, pressure testing, or other operations that may be needed during the life of the project. The trenches were back filled with cement slurry to prevent the possibility of settling. 4.2 Manifolds The vapor extraction wells and the sparge wells were equipped with separate manifold systems to allow simultaneous operation of up to 4 sparge wells and any single vapor extractor well. ' The vapor extraction manifold consists of a bank six of 3-inch diameter inlet ports and each of the ports is equipped with a Cam-lock fitting. A three-inch flexible hose, also equipped with Cam-lock fittings then connects to the inlet of any of the six vapor extraction wells. Idle wells are temporarily sealed with a threaded cap. The riser of each vapor extraction well is also equipped with a sample port where samples of the gasoline- laden vapor from each well may be collected, and the velocity of air in each well may be measured with a digital manometer. The sparge manifold consists of a 1/4 inch i.d, plenum with four exhaust outlets and each outlet is connected to a sparge well with high-pressure flexible hose. Each of the four air outlets is also equipped with an inline, limiting orifice Rotameter flow gauge with needle ' valves capable of regulating and monitoring up to 10 scfm of air into each the four sparge wells. r2937 Veneman Ave., #B240 Geo-Phase Environmental Inc. Phone(209) 569-0293 Modesto, CA 95356 Fax(209) 569-0295