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Remedial Action Plan Addendum January 14, 1993 Southland Store No. 20304, 455 Grant Line Rd., Tracy, CA 5 groundwater will be achieved by hydraulically controlling groundwater migration using groundwater extraction followed by treatment. Drawdown of the groundwater surface caused by extraction may effectively dewater a portion of the saturated zone. This would expose more hydrocarbon-impacted soils, significantly increasing the �• possibility of using soil vapor extraction technology to effectively eliminate the source of contamination. Therefore, after hydraulic containment (and possibly dewatering) is achieved, the �. use of soil vapor extraction to enhance source elimination will be evaluated by conducting a soil vapor extraction test using the existing monitoring wells. The Regional Water Quality Control Board--Central Valley Region (RWQCB--CV), the wastewater discharge controlling authority, prefers reinjection rather than surface water discharge to protect `r State of California surface waters. The RQWCB-CV will require additional testing and evaluation of the infeasibility of reinjection before granting authority to discharge to the storm drain. Therefore, �. reinjection testing will follow the aquifer drawdown and soil vapor extraction test period to obtain the necessary data for determining the viability of reinjection. An application for discharging treated groundwater to both the State of California surface waters and land disposal will be prepared and submitted to the RWQCB-CV. These two permits will allow discharge of treated water to the storm drain system and reinjection during the aquffer/vadose zone test period. 2.2 Source Elimination (Phase II) V Based on the data collected from the aquifer drawdown, reinjection, and soil vapor extraction tests In Phase I, soil vapor extraction and soil flushing through groundwater reinjection will be evaluated for source elimination. 2.3 Regulatory Considerations Activities will be performed under the direction and with the approval of the lead agency for this site, the San Joaquin County Environmental Health Department (SJCEHD). Additional permitting y authorities include the RWQCB—CV, the California Department of Toxic Substances Control (DTSC), and the City of Tracy Fire, Planning, and Building Departments (TFPBD). R3263A1.SLL GROUNDWATER TECHNOLOGY,INC. w