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I CLEARWATER G R O U P Environmental Services ' 6.0 PROPOSED REMEDIAL ACTION PLAN I6.1 Remedial Action Plan Preparation The RAP will describe the remediation efforts, system layout, equipment type, permit requirements, and start-up and monitoring activities Recommended remedial actions will begin following CVRWQCB approval of the RAP 6.2 Purpose and Scope ' The purpose of proposed remedial action is to effectively capture and remove contaminants from groundwater and soil Following evaluation of remedial options, a remedial approach is selected iand discussed in detail The feasibilities of several soil and groundwater remediation options were evaluated in Clearwater's Corrective Action Plan (CAP) (November 12, 2002) Enhanced bioremediation using submerged oxygen-infusion technology (1SOC), with quarterly groundwater monitoring including MNA parameters, was identified as the most feasible remedial Ialternative for the site 6.3 Enhanced Bioremediation by iSOC Submerged Oxygen-Infusion ' Bioremediation has been growing as a remediation concept since the mid 1990's Subsurface oxygen concentration (as well as concentrations of other nutrients) is typically a limiting factor in ' the effectiveness of in-situ bioremediation Presently there are a variety of technologies available which deliver low to moderate concentrations (10-20 ppm) of stable dissolved oxygen into ' groundwater One of these technologies is 1SOC, which diffuses OZ gas directly into groundwater in a dissolved state Previous MNA studies of the site determined that sufficient ' microbe populations are present in groundwater, and that "intrinsic" bioremediation is occurring on the site The results of the MNA studies indicate that enhancement of oxygen, ammonium, ' and phosphate concentrations would accelerate hydrocarbon biodegradation Ammonium and • phosphate could be periodically infected, if approved by SJC-EHD, using water-based solutions 1 ZB178C RAP 19 May 18,2004