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' 15 April 2004 AGE-NC Project No 99-0559 ' Page 6of13 ' 3 2 INSTALLATION OF GROUND WATER EXTRACTION SYSTEM The ground water extraction system consisting of the ground water treatment unit and associated piping was installed between 18 February and 26 June 2003 3 2 1 Installation of Underground Ground Water Extraction Pipe-Line-Conduit Between 02 April and 09 Apnl 2003, approximately 18-inch wide by 8-inch deep trenches were cut out of the asphalt surface, the asphalt waste was transported to F T G Construction Materials Inc , a concrete recycling facility located in Stockton, California Afterwards,a mini-excavator equipped with a 18-inch bucket was utilized to excavate soil in the above referenced trench-lincs to a depth of approximately 24 inches, and a 2-inch-diameter ABS pipeline was placed in each excavated trench Excavation cuttings were temporarily stockpiled on-site adjacent to the trenches A % and '/4-inch diameter poly vinyl tubing were placed In each pipeline to connect an extraction-well pump to the ground-water remediation system Afterwards, each trench was backfilled with excavated soil to 4-inches bsg, the remaining space was resurfaced with asphalt and concrete A map depicting the on-site trench system is depicted in Figure 2 3 2 2 Installation of Ground Water Extraction Pumps Between 10 April and 15 April 2003, 3 5-inch diameter, stainless steel Geotech model 3 5 Auto- Reclaimer pneumatic powered, down-well pumps were installed in ground water extraction wells EW-1 through EW-4, at a depth of approximately 75 feet bsg, the pumps were internally equipped with a one-way check valve to prevent back-flow Two polyvinyl tubing were routed from the pump f to the top of the well casing and through a 4-inch diameter sanitary well seal to an underground pipeline leading to the remediation system At the front end of the remediation system (before the 500-gallon holding tank), a manifold was created with independent flow meters and a dedicated sampling port to allow sampling of each well independently without having to remove the well head assembly 3 2 3 Installation of Ground Water Treatment System The ground water remediation system consists of one 500-gallon poly tank (holding tank), one process pump, one sediment filter chamber and four 1,000-gallon Granular Active Carbon media vessels The ground water pump and treat system layout is depicted in Figures 3 Ground water pumped from the extraction wells is initially routed via the underground pipelines to the 500-gallon Advanced GeoEnviron mental,Inc