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Workplan for Interim Remediation&0'Quarter 2400 Groundwater Monitoring Report Former Moore Petroleum Bulk Plant,5491 F Street,Banta,California Page 6 of 9 Upon receipt of the analytical data, Apex will determine the appropriate number and size of activated carbon vessels needed to treat the evacuated water. After treatment, all water will be discharged through the storm sewer system. The only storm water drain is shown on Figure 5. The water enters the drain and then flows under Oh Street, and discharges into the pasture behind the Rhodes property. To discharge the water through the storm drain, an NPDES Permit will be required. This permit will also be necessary for interim remediation water discharge. The two. 21,000-gallon water tanks will be decontaminated before they are removed from the site and the decontamination water will also be treated through the activated carbon tanks. Any sediment that has accumulated in the tanks will be sampled and properly disposed. The activated carbon tanks will be removed by the vendor and properly recycled. VAPOR TEST On May 5, 1995, a soil vapor extraction system consisting of an R.S.I. SAVE system was installed at the subject site. The vapor extraction system was installed per San Joaquin Valley Unified Air Pollution Control District (SJVUAPCD) Permit conditions. The vapor extraction system consists of an internal combustion engine with catalytic converters mounted on the exhaust. The system was configured such that soil vapors could be extracted from either the western vapor well VEW-1 and/or monitoring well MW-1. The system was started on May 5, 1995, and operated through October 4, 1995, at which time it was temporarily removed from site. On November 27, 1995, the system was returned to the subject site and restarted. On April 29, 1997, Apex received permission from the County to shut down the air sparge and vapor extraction system due to low influent soil vapor concentrations to the vapor extraction system. As of April 29, 1997, the remediation system has extracted a total of 1,730 pounds of TPHg and 19.9 pounds of benzene. This former remediation system concentrated on the area associated with the former loading rack and not the eastern portion of the site (Figure 2). Apex will use the data from the former vapor extraction system to design the proposed vapor extraction system at this site. The Air Permit with SJVUAPCD is still active at this site. Apex may decide to use the current R.S.I. SAVE system depending on the units operating condition. Once Apex evaluates the groundwater pump test results and historical vapor results,we will then finalize the complete installation of a groundwater pump and treat and vapor extraction remediation systems.