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5.0 IN-SITU AIR SPARGING PILOT TEST <br /> 5.1 In-Situ Air Sparging (IAS) <br /> The basis of air sparging is the introduction of air r other gases beneath the water table <br /> to encourage the breakdown and remediation of hydrocarbons. In-situ air sparging (IAS) <br /> uses two mechanisms, volatilization and bioremediation. Volatilization evaporates and <br /> removes the hydrocarbons; aerobic bioremediation is stimulated by the introduction of <br /> oxygen (air). <br /> 5.2 IAS Pilot Test <br />' An air sparging ilot stud will be performed to d termine radial influences of the IAS <br /> P Y <br /> system at different rates/pressures, the pressure and vacuum requirements for effective <br /> treatment and effective capture of volatilized materials, and water table mounding caused <br /> by operation of the IAS system. These parameters will facilitate the design of an IAS system <br /> and will be used to design the number of air injection (sparging) and recovery wells, the <br /> spacing of wells and the need for hydraulic control of the site. An extraction well and <br /> sparging well will be installed on-site. The two wells will be completed in a common pilot <br />�- boring. Two blowers will be used for the Pilot Study. One blower will inject air into the <br />( sparging well; the other will create a vacuum on th recovery well. <br /> 6.0 PROCEDUIRES <br /> 6.1 Drilling and Sampling <br /> The following procedures will be performed to com Iete the drilling and sampling: <br /> 1) Prepare a site health and safety plan in accorc ance with the Occupational Safety and <br /> Health Guidance Manual for Hazardous Waste Site Activities - Prepared by National <br /> r Institute for Occupational Safety and Hea th, Occupational Safety and Health <br /> y Administration, U.S. Coast Guard and U.S. Environmental Protection Agency, <br /> October 1985. <br /> r <br /> 2) Notify the EHD 48 hours prior to commenc went of any work. <br /> 3) Drill a total of three (3) soil borings. Boring B11 and B12 will be drilled to depths <br /> of approximately 25 feet; boring B13 will be drilled to a depth of 10 feet. All borings <br /> will be drilled utilizing a hollow-stem auger d 'll rig. The estimated boring locations <br /> are depicted on Figure 2. <br /> 4) Collect and log soil samples at 5-foot inten als. Auger returns will be logged in <br /> c,AbS�.i aeait S,M-.reg. 3 <br /> IMO-94AAMMEaSVFC15 w� <br /> r <br />