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FIRST QUARTER 2108 GROUNDWATER TREATMENT FACILITY MONITORING REPORT FORWARD LANDFILL WDR ORDER NO.R54003M80 TABLE 1 Monthly Average Effluent Flow Rates First Quarter 2008 Groundwater Treatment Facility Monitoring Report, Forward Landfill WDR Order No. R5-2003-0080 Average Flow Rate Month (gallons per day) January 286,000 February 279,000 March 293,000 At the beginning of first quarter 2008,extraction wells(EW)-1 and EW-2 were operational, and the GTF effluent was discharging to the infiltration pond. The GTF shut down on January 11,2008,because of a short circuit in the 480-volt feeder cables located inside the GTF 480-volt control panel.The short circuit damaged the GTF main circuit breaker and the three feeder cables.An electrician visited the GTF on January 17,2008,to remove the damaged feeder cables and main circuit breaker from the 480-volt panel. The electrician installed new feeder cables,temporarily bypassed the main circuit breaker,and restarted the plant. The electrician returned to the GTF on February 5,2008, and installed a new main circuit breaker and new grommets at the feeder cable penetrations to the 480-volt panel.The plant was restarted following repairs on February 5,2008,with both extraction wells operating. During a routine inspection of the GTF on February 7,2008,the Landfill Operations Supervisor observed water leaking from the isolation valve vault located adjacent to extraction well EW-1. After discovering the leak,the supervisor immediately shut off EW-1 and EW-2 and closed the isolation valve. Closing the valve isolates the conveyance piping between EW-1 and EW-2. The GTF remained off overnight.The CV Water Board was informed of the leak via email on February 8,2008 (Burke,2008,personal communication). The GTF was restarted on February 8,2008,with EW-1 operating and EW-2 off.While ' inspecting the isolation valve vault approximately four hours after restarting the GTF,water was observed slowly filling the vault,which indicated that the isolation valve had failed. None of the leaking water exited the vault.The GTF was immediately shut off and the soil beneath the isolation valve vault was excavated.The leak occurred at a 90-degree convey- ance pipe elbow beneath the isolation valve vault.On February 13,2008,the GTF convey- ance pipe was repaired,the isolation valve was replaced,and the GTF remained off for 24 hours to allow the polyvinylchloride pipe cement to cure.The GTF was restarted on February 14,2008, and resumed normal operation. A technician visited the site on February 29,2008,and reprogrammed the GTF autodialer. The autodialer program parameters had defaulted as a result of the power outage on January 11,2008.The default conditions increased the time delay before alarms were rec- ognized by the autodialer,and also increased the time delay before alarms were issued by the autodialer. During first quarter 2008,CH2M HILL began evaluating operation of EW-2.The water level at EW-2 was measured on January 10 and March 4,2008.The depth to water was not recorded on January 10,2008,because of an obstruction at 97 feet below the well seal. On March 4,2008,the depth to water was measured at 94.8 feet below the well seal,a level that RDD/(CLR3846.DOC) 2