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1 �12ecif i i R91025-Q 3.0 The Work Plan approach is to remove Volatile Organic Compound (VOC) contamination from soil by designing a soil treatment cell extending from the site surface to the water table,approximately 65-70 feet below grade. Design of the well-extraction field would be based on pilot-test data discussed in Section 4.0 of this specirication. VOCs would be removed from the soils by ' establishing air flow through passive injection wells located around the perimeter of the soil treatment cell and withdrawing VOC-laden air Evia an extraction well located near the center of the cell. Contaminated air ' withdrawn from the soil would be passed through either a carbon-adsorption ,. bed or a catalytic oxidizer for treatment. Selection of the Air Pollution Control(APC)device would be determined from pilot test data. The carbon bed or oxidizer satisfies the requirements for an air-pollution control system. (Carbon, when exhausted, would be removed, replaced and transported to a recycler for regeneration. The treated air would be discharged to atmosphere. Treatment would proceed until VOC concentrations in the soil have been reduced to below clean-up standard levels (to be determined). A post remediation soil assessment would be conducted to evaluate VOC t concentrations in treated soil. j 4.0 EUgL T 4.1 The Pilot-Extraction Test is designed to utilize one vapor-extraction well, to be ;.� installed as described in Section 5.0 of this specification, and manometer points to be located at approximate radial distances from the extraction well of 15, 30,. and 50 feet, as shown on Figure 3. Tubes for manometer points would be installed within the interval of extraction, approximately 30 and 63 feet below ground-surface. The purpose of the test is to: 1) approximate vadose-zone permeability which will provide data for design of well depths,wellspacings,and 4�. extraction rates, 2) estimate the decay curve for TPI-I concentration from the well vapors, and 31, evaluate expected air pollution conitol system loading, The Pilot Test will also provide information to select the blower,piping and manifold diameters, and well geometries. 4.2 The location of VEW-1 would be approximately three feet east of MW 1 for ►� which available soil analytical results indicate high concentrations of TPHIt is anticipated that the data from the pilot test will indicate that VEW-1 wotlild be of suitable design and placement for the full scale system as well as the pilot test. -4.3 A 1.5 HP blower with a capacity of 127 SCFM at 4.3 inches of mercury vacuum and 55 inches of water discharge pressure would be used for the test. Power would be supplied by the Apache Plastics facility. Either 115V or 230V single phase power would be required. Blower electricals world be explosion proof. The blower would discharge through four carbon beds,each comprised of an 85- gallon carbon canister. Moisture would be removed from the vapor stream prior to the carbon canisters with an in-line knockout pot. Drawing M-1 is the Piping N.. B-2 REMEDIATION 4. SERVICES, INC.