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groundwater, After the Phase I RAP is implemented, performance monitoring will provide data that can be used to address additional monitoring and remediation of the groundwater plume beyond the near-source area. Pha,e I—Remediation Plan The near-source remediation area is shown on Figure 4-2. The recommended Phase I remedial action combines groundwater extraction, sparging, in situ bioremediation, air stripping, and groundwater reinjection as shown on Figure 4-3. The conceptual design of this system includes three extraction wells producing about 5 gpm each, one sparghIg well,an air stripping system including 2 towers in series, offgas GAC,and an infiltration gallery. The air stripper will be designed to treat off-gas with activated carbon according to the requirements of the San Joaquin Valley Unified Air Pollution Control District (SJVUAPCD). The sparging well will be equipped with a.vapor recovery well to prevent migration of hydrocarbon vapors to the surface. In situ bioremediation will initially consist of oxygen addition via the sparging well. If during system performance monitoring it is determined that nutrient addition (nitrogen, and/or phosphorus) is necessary, modifications will be made to the groundwater reinjection system. Performance Monitoring System performance monitoring is necessary and required to ensure that the treatment system is operating as specified. Performance monitoring will include periodic monitoring of treated groundwater reinjection, air emissions, and in situ groundwater quality. Permits The Phase I system will require the following permits: • Well permit from SJ PHS • Waste discharge requirements from Central Valley Regional Water Quality Control Board (for groundwater reinjection) • Authority to construct and permit to operate from SJVUAPCD Obtaining the latter two permits will require engineering &sign and preparation of additional reports to submit with permit applications. 5r033W4RFo07.51 4-9