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FOURTH QUARTER 2006 GROUNDWATER TREATMENT FACILITY MONITORING REPORT FORWARD LANDFILL WDR ORDER NO.R5-2003-0080 TABLE 1 Monthly Average Effluent Flow Rates Fourth Quarter 2111 Groundwater Treatment Facility Monitoring Report, Forward Landfill WDR Order No.R5-2003-0080 Average Flow Rate Month (gallons per day) October 313,000 November 360,000 December 281,000 At the beginning of fourth quarter 2006,both extraction wells were operational,and the effluent was discharging to the infiltration pond.The pressure gauge at EW-2 was replaced on October 12,2006. During the week of October 23,2006,additional metal barriers and sandbags were installed adjacent to EW-1 and EW-2 to divert runoff and prevent silt accumulation inside the concrete equipment vaults located at both wells. On October 30,2006,the submersible pump at EW-2 was observed to be cycling on and off, and the sample ports at both extraction wells were found to be leaking. On October 31,2006, both extraction wells were observed to be cycling on and off,and the GTF was shut down. The extraction well sample ports,the GTF influent sample port,and the GTF influent pressure gauge were replaced on October 31,2006. An electrician examined the GTF on November 3,2006,and determined that the cycling of the extraction well pumps was caused by disruption of the radio signals transmitted to the wells. After consulting with the manufacturer of the GTF radio controls,the GTF radio transmitter antenna and transmitter unit were replaced on November 9 and 13,2006,respectively.The GTF was restarted for continuous operation on November 13,2006.The pressure gauges at both extraction wells were replaced on November 16,2006,as a result of damage sustained during cycling of the submersible pumps. During fourth quarter 2006,intermittent outages occurred in the GTF autodialer telephone line.The wire to the AT&T telephone pole was replaced and the GTF phone conduit was repaired on November 9,2006. An electrician tested the GTF autodialer on December 1, 2006,and determined that the incoming AT&T phone line had failed. The telephone line was successfully repaired by AT&T on December 4,2006. A power outage occurred at the GTF on December 4, 2006,and the plant was restarted.The paddle wheel flow sensor at EW-2 was replaced on December 4,2006, and the sensor was rewired to the wellhead display panel. A power outage occurred at the GTF on December 10,2006,and the plant was restarted on December 11. The GTF experienced additional power outages on December 16 and 17,2006, and was restarted on December 18,2006. During inspections of the GTF on December 19 and 20,2006,wet soils were observed in the site access road approximately 400 to 450 feet east of EW-2. An elevated wellhead pressure was also observed at EW-2.On December 20,2006, EW-2 was shut off and the gate valve adjacent to EW-1 was closed to isolate the conveyance pipeline between EW-1 and EW-2. Shortly thereafter,the pressure in the pipe between EW-1 and EW-2 decreased to zero. According to these results,there appeared to be a leak in the buried groundwater RDD/070170002(NLH3358.DOC) 2