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1.01 07 June 2012 AGE-NC Project No. 95-0184 Page 10 of 14 For the IAS system, a network of one-inch diameter, schedule 80 PVC piping will be installed 12-inches below surface grade or above grade where secured to structures. The PVC piping will be routed from each valved IAS well head to the air compressor. A PVC ball valve will be installed at each IAS well head so that air flow can be controlled independently. A plan of the proposed SVE/IAS piping system is depicted in Figure 7. 4.4. PROPOSED SVE/IAS SYSTEM The proposed SVE remediation system (250 CFM Oxidizer)will consist of a condensation separator, a 250 standard cubicfeet/minute(CFM)vacuum blower(positive displacement), a catalytic oxidizer (supplemental fuel: natural gas) and electric control components. Three-inch diameter piping installed underground will be connected from the above referenced SVE wells and will be routed to the inlet of the condensation separator which connects to the vacuum blower; the outlet from the vacuum blower will be routed through a catalytic oxidizer. The induced vacuum will be measured utilizing a Magnehelic vacuum gauge attached to the inlet of the blower; SVE air flow will be monitored using a Dwyer DS-200 flow sensor or flow totalizing rotometer. Sampling ports will be installed upstream of the vacuum blower inlet to recover SVE influent soil vapor stream samples, and downstream of the thermal oxidizer to recover effluent SVE flow samples and to monitor the efficiency of hydrocarbon destruction. Following a documented reduction of soil vapor concentrations (approximately 75%) or when concentrations are diminished to levels compatible, catalytic oxidation will be replaced with active carbon adsorption,for soil vapor emissions controls. The proposed IAS system will consist of a 5-horsepower, electric air compressor that will generate a regulated pressure of clean air to be injected beneath the water table. From the outlet of the air compressor, 1-inch diameter PVC piping will connect to an IAS manifold network(located inside the treatment compound);the IAS manifold will consist of a network of PVC ball valves, pressure gauges, air flow gauges and air pressure regulators for added controls to each individual air sparge well. A PVC ball valve, an air pressure gauge, an oil filter and an air pressure regulator will be installed at the outlet of the air compressor for added controls. From the manifold, a network consisting of 1-inch diameter, schedule 80 PVC piping will be installed underground to the IAS well heads. The injected air should volatilize dissolved hydrocarbons in the ground water and force hydrocarbon vapors into the vadose zone, where they can be withdrawn by the SVE system described above. Advanced GeoEnvironmental,Inc.