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' Former Beacon Station No. 12474 March 18,2002 Stockton California Problem Assessment Report/Corrective Action Plan • A catalytic oxidizer (Cat-Ox) for the treatment of extracted soil vapors; concentrations of TPHg from vapor extraction well VW-2 ranged up to 13,000 ppm; • Appropriate flow controllers, sampling ports, and pressure and air temperature sensors. + Operation and maintenance (O&M) of the SVES to ensure compliance with operating permits. • Compressed air conveyance piping in trenches from the remediation compound to air sparge well AS-1, monitoring wells MW-2 and MW-12, and potentially an additional air sparge well (AS-2) east of monitoring well MW-10 (Figure 9); • An approximately 5 cubic feet per minute, oilless electrically-driven compressor; and Appropriate flow controller, sampling ports, and pressure and air temperature sensors. 10.3 Required Permits At a minimum, the operation of the remediation systems would require a permit from the San Joaquin Valley Air Quality Management District (SJVAQMD). Air discharge permits are routinely issued for SVE systems. A permit from the City of Stockton for the discharge of treated groundwater into the sanitary sewer system is required to operate a groundwater extraction. According to the Environmental Control Officer at the City of Stockton Wastewater Control Division, wastewater discharge permits are approved for such operations. 10.4 Implementation Schedule Horizon understands that the SJCEHD review process allows for public comment regarding . the proposed corrective action. After completion of the CAP review process, the SJCEHD 474PARCAP3-02.doe 22 Project No. 1474.23 HORIZON ENVIRONMENTAL INC.