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Working To Restore Nature Addendum One to Remedial Action Plan March 1, 1993 Coca-Cola Former Distribution Facility, Stockton, California 54006.01 ' discharged through a stack. ' Double Containment Pipe for Potential Groundwater Remediation In the event that a future groundwater remediation system may be required by the ' regulatory agencies, a second PVC pipe is proposed to be installed in the vapor collection pipe trench. This pipe will serve as a double containment pipe into which a groundwater collection pipe can be inserted at a future date, if needed. This avoids having to interrupt ' normal facility operations and avoids the cost of concrete cutting and re-trenching of the entire area if a groundwater remediation system is required About 150 feet of 4-inch diameter, Schedule 40 PVC pipe will be installed in the vapor pipe trench from well MW-3, the most impacted well, to the remediation compound. This pipe will be terminated and capped at the compound and at well MW-3. ' Treatment Processes for Off-Gas Abatement The off-gas treatment processes will be located in the remediation compound. The proposed location of the remediation compound is shown in Plate 6. The proposed remediation compound will be about 20 feet long by 20 feet wide and allows some space for a groundwater remediation system if it is required at a future date. The remediation ' compound will be fenced to preclude public access. The proposed location of the remediation compound was selected so that treated off-gas would not be released in the covered storage bay areas or near personnel in the commercial operating area. The ' proposed location of the remediation compound is contingent upon approval by Coca-Cola, the SJCEHD, the San Joaquin Valley Unified Air Pollution Control District(SJVUAPCD), and American Performance, the current lessee of the property. Plate 7 illustrates the proposed Process Flow Diagram for the off-gas abatement processes. ' The process and other equipment at the remediation compound will include a skid-mounted condensate separator to remove any moisture in extracted vapor, a skid-mounted pneumatic condensate drain pump and a double contained condensate storage tank; a skid-mounted vacuum blower to extract vapor from the wells; a skid-mounted thermal oxidizer to treat extracted vapors to meet regulatory emissions limits; an air flow meter to measure total air flow to the system; a set of associated piping, control valves, and necessary electoral and ' instrumentation; a remote monitoring system to transmit the status of process variables and any alarm conditions to RESNA's Stockton office; and a remediation compound fence. The use of a thermal oxidizer at this site is a viable off-gas abatement alternative for the projected TPHg concentrations (average of 5,287 mg/m3), for the type of soil (clayey and 5 1