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SECOND QUARTER 2006 GROUNDWATER TREATMENT FACILITY MONITORING REPORT FORWARD LANDFILL WDR ORDER NO.R5-2003-0080 TABLE 1 Monthly Average Effluent Flow Rates Forward Landfill Groundwater Treatment Facility Monitoring Report,Second Quarter 2006 Average Flow Rate Month (gallons per day) Aprila 138,000 May 147,000 June 305,000 aThe GTF only operated on April 26,2006,to perform a 2-hour operational test. At the beginning of second quarter 2006,the GTF was off.The plant had been shut down on March 30,2006,after an elevated air pressure was measured at the air stripper blower. Following several weather-related delays,the air stripper was inspected with a man-lift on April 26,2006,to identify the source of the excess pressure. The air stripper packing, manways,spray nozzle,demister,and rain hat were inspected. The inspection revealed that the excess pressure resulted from a clogged bird screen at the air stripper rain hat. After the bird screen was cleaned,the GTF was restarted to perform a 2-hour operational test with EW-1 on and EW-2 off.The plant operated long enough to collect an effluent sample. During the test,the blower motor drew a high current. The operational test ended when the motor overloads tripped and the GTF shut down.The GTF remained off until the motor was inspected on May 3,2006.Inspection revealed that the blower damper had been opened too far during maintenance in late March,resulting in high air flow and excessive current draw by the motor.The damper was adjusted,and the GTF was restarted with EW-1 on and EW-2 off.The motor current was within operating limits following the restart. In addition,on May 3,2006,the neutralized,buffered acid wash effluent generated during first quarter 2006 was disposed of at the City of Stockton Regional Wastewater Control Facility. The GTF operated in this configuration until May 11,2006,when it was shut down to inspect the polyvinyl chloride (PVC) conveyance pipe and fittings located in a vault adjacent to EW-1.During the inspection,a sample port inside the vault was accidentally broken.The sample port was replaced,and the GTF was restarted on May 17,2006. The GTF was shut down on May 31,2006,to install radio controls at the GTF main control panel and at both extraction wells.The radio units were installed to replace the existing buried control wires for both EW-1 and EW-2,and to restore automatic operation of EW-2. The radio controls were successfully tested on June 2,2006,and the GTF was restarted with both wells operating in automatic mode.The GTF operated at 100 percent uptime between June 2 and June 30,2006. During installation of the radio controls,the GTF main control panel was thoroughly inspected to r, move excess and unused instrumentation and control equipment.This maintenance was performed to simplify GTF operation. In addition,during May 2006,the power supply conductors to EW-1 were checked and found to be in good operating condition. The conductors do not require replacement at this time and will be left in place. Beginning in third quarter 2006,the EW-1 conductors will be checked once per quarter to confirm that they remain in good working order. RDDI062060008(CAH3547.DOC) 2