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ame& L4.0 AIR SPARGING PILOT TEST AS is the process of injecting air directly into groundwater. AS is used to remediate impacted groundwater and soil beneath the water table by volatilizing contaminants and creating aerobic conditions to enhance natural biodegradation. Contaminants that are volatilized are typically captured in the vadose using SVE techniques. The following section describes the rationale and approach.for implementing the AS pilot test at the Site, including baseline sampling, monitoring, pilot test procedures, and analysis. 4.1 RATIONALE AND OBJECTIVES The main objective of the AS pilot test is to determine if AS can be successfully implemented to remediate petroleum hydrocarbon impacted soil and groundwater at the Site. The data collected during the test will be qualitatively evaluated to determine if air can be sufficiently injected to volatilize contaminants in groundwater and to increase dissolved oxygen concentrations such that conditions in the subsurface change from anaerobic to aerobic. If the results support the use of AS at the Site, the pilot test data will be used to develop full scale design parameters, including well spacing, injection flow rates, injection pressure, and ROI.' Specific design parameters objectives of the AS-pilot test include the following: • Determine the ROI of an AS well; * Collect data to e a v lua e the air pressure ressure and air flow characteristics at the location . of the AS well; and • Collect data to evaluate the extent and time delay for groundwater mounding and . subsequent subsidence that may result from air injection (groundwater mounding transition time)to determine sparge cycles (on/off operation of the AS well). 4.2 PRE-FIELD ACTIVITIES Pre-field activities will include development of a health and safety plan, permitting and Site access, and underground utility clearance. 4.2.1 Permitting and Site Access AMEC does not anticipate any permitting required for this pilot scale test. As part of the pre-field effort, field work will be coordinated with,Caltrans personnel. 4.3 PILOT TEST EQUIPMENT The air injection system will consist primarily of an AS injection well, tracer gas manifold, compressor, generator, and ancillary equipment including a'pressure relief valve, flow control AMEC Geomatrix, Inc. P:\Project\14000s\14443_Cahrans\TO 10\11000_PLANS\AS WP_March 2010WS WP.doc 12