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ASS O C I ATE S t N . <br /> required to achieve similar air flaws may be lower. The AS system will be operated using individual <br /> wells in sequence with on-line vapor extraction wells to control migrate of the groundwater plume. <br /> Similar to the VES,the actual radius of influence for each sparge well will vary and the effective radius <br /> of influence should be evaluated following;long-term operation of the AS system. <br /> 5.2.2 Air Sparging Process <br /> In-situ air sparging is the process of injecting air into the saturated zone via sparge;wells. Sparge <br /> wells are designed with a screen interval at a depth approximately 15 to 20'feet below the water <br /> table, Pressurized air is forced out through the screen and into the saturated zone: The air forms <br /> bubbles that rise to the unsaturated zone, carrying trapped and dissolved contaminants. Vapor <br /> extraction wells in the unsaturated,zone capture sparged air which is then treated through the <br /> vapor extraction system. The proposed AS system will include a blowerlair compressor; associated <br /> piping, control valves, pressure gauges, flow meters, instrumentation and controls, and a remediation <br /> compound shared with the VES. <br /> 6.0 PROPOSED SCOPE OF WORK <br /> Based on the results of previous subsurface investigations, ATC proposes the following project tasks <br /> for remediation of soil and groundwater. The tasks are described in detail in following sections: <br /> Task 1. Final Design Plans and Specifications <br /> Task 2. Building, Air Pollution Control District,and Well Installation permits <br /> "Task 3. Bid Package and Bid Evaluation <br /> Task 4. Construction and Construction Inspection <br /> Task 5. Systems Startup and Operation <br /> Task 6. Systems Performance Evaluation <br /> 6.1 Final Desigg Plans and Specifications <br /> This phase of the proposed work will include engineering calculations; preparation of a list of <br /> equipment,selection of materials and instrumentation;preparation of Plans and Specifications including <br /> site and remediation compound layout, remediation compound equipment details, trench and section <br /> w:a62574.01\cAP tepon:doc 10 <br />