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15 June 2004 AGE-NC Project No 95-0142 Page 4 of 12 2 2 2 Installation of Underground Ground Water Extraction Pipeline Conduit Between 29 September and 01 November 2003,the underground ground water extraction piping was installed at the site A 150-foot long trench was excavated approximately 18-inches wide 24-inches deep using a backhoe equipped with an 18-inch bucket Excavated materials(asphalt and soil)were temporarily stockpiled adjacent to the trenches on site A map depicting the on-site trench system is depicted in Figure 3 A one-inch diameter PVC pipe was installed to extraction well EW-1 for ground water recovery An electrical conduit of 2-inch diameter ABS piping was installed to extraction well EW-1 for pump j control I A 2-inch diameter, ABS piping (conduit) was installed in the on-site trench at approximately 18- inches bsg A manifold piping system was utilized in the trench to connect the process piping system from each extraction well head to the ground water treatment system From the ground water extraction pump, tubing was routed through the individual conduits within the trench to the pneumatic controls for the treatment system Following placement of all tubing and conduits, the . trench was backfilled with the excavated soil to 4-inches bsg and compacted The trench was then resurfaced with with approximately 4-Inches of asphalt 2 2 3 Installation of Ground Water Extraction Pumps On 20 January 2004, four 1 5-mch diameter, stainless steel QED Environmental model H23SET pneumatic powered,down-well pumps were installed in vapor extraction wells VW-1,VW-2,VW-3 and VW-4 The pumps were internally equipped with a one-way check valve to prevent back-flow The pumps were installed in each well at a depth of approximately 45 feet bsg One-half inch diameter poly-vinyl chloride(PVC)tubing was routed from eachpump to the top of each well casing and through a 2-mch diameter sanitary well seal In the remediation area, a manifold was created with independent flow meters and a dedicated sampling port to allow sampling of each well independently without having to remove each respective well head assembly On 02 February 2004, a 4-inch diameter, stainless steel model 5S8 Grundfos Rediflow down-well pump equipped with 230 volt Y2-horsepower 3-wire motors were installed in ground water extraction well EW-1 The Grundfos pump was installed in well EW-1 at a depth of approximately 65 feet below surface grade (bsg) Schedule 40, 1-Inch diameter PVC tubing was routed from the pump to the top of the well casing and through a 4-inch diameter sanitary well seal In the remediation area, an Independent flow meter and a sampling port was installed to allow sampling of the well without having to remove the well head assembly Advanced CeoEnvironmental,Inc