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1 <br /> Harding Lawson Associates <br /> be used in the existing concrete areas (sidewalk and treatment <br /> compound) . <br /> 3 . Task 3 - <br /> Install Soil Vapor Extraction System <br /> Electrical service will be established inside the wall <br /> of the treatment compound. Power service will be obtained to <br /> iprovide 220 volt AC, single phase power; electrical work will be <br /> performed by a licensed contractor. A vacuum blower connected to <br /> a five horsepower electric motor will be mounted on a bracket <br /> ' which will be secured to the concrete pad surface. The inlet of <br /> the blower will be manxfolded to a water separation unit to <br /> prevent any moisture from being drawn into the system. A 4-inch <br /> PVC common manifold line will connect the five 2-inch PVC vapor <br /> lines with individual ball-valves to the inlet of the water <br /> 1 separator. The exhaust of the blower will be connected through a <br /> 4-inch PVC line to two activated carbon adsorption reactors <br /> connected in series (2 , 000 pounds each) . The exhaust from the <br /> ' second reactor will pass through an exhaust stack to a point 10 <br /> feet above the ground surface. <br /> 4. Task 4 - Start-up and Monitor Soil-Vapor Treatment <br /> Sstem <br /> We expect that the construction operations described in <br /> Tasks 1 through 3 above will take approximately two to three <br /> ' weeks; partial store closure may be necessaryfor <br /> several days to <br /> install trenches and piping. The balance of the work can be done <br /> without station closure. <br /> ' 28 <br />