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SECOND QUARTER 2007 GROUNDWATER TREATMENT FACILITY MONITORING REPORT <br /> FORWARD LANDFILL WDR ORDER NO.R5S2003-0080 <br /> TABLE 1 <br /> Monthly Average Effluent Flow Rates <br /> Second Quarter 2111 Groundwater Treatment Facility Monitoring Report, <br /> Forward Landfill WDR Order No. R5-2003-0080 <br /> Average Flow Rate <br /> Month (gallons per day) <br /> April 320,000 <br /> May 307,000 <br /> June 226,000 <br /> At the beginning of second quarter 2007,EW-1 was operational,and the effluent was <br /> discharging to the infiltration pond. EW-2 was shut off on March 21,2007,because of a <br /> cracked check valve inside the wellhead vault. The conveyance pipeline between EW-1 and <br /> EW-2 was isolated on March 21,2007. <br /> A new check valve was installed inside the wellhead vault at EW-2 on April 3,2007. Several <br /> flange gaskets inside the vault were also replaced as preventive maintenance. A brief <br /> operational test of EW-2 was performed on April 4,2007,and no leaks were observed inside <br /> the wellhead vault. EW-2 was restarted on April 5,2007. <br /> An electrician visited the GTF on April 5,2007, and performed several tasks.The electrician <br /> replaced the control power circuit breakers at EW-1 and EW-2,and rewired the power <br /> supplies at both extraction wells to eliminate electrical hazards.The electrician also replaced <br /> the flow totalizer backup batteries at EW-1,EW-2,and the main plant. <br /> During a site visit on May 16,2007,a rapid drip leak was discovered at the sample port at <br /> EW-2, and both extraction wells were cycling on and off at approximately the same time. All <br /> of the leaking water was contained in the EW-2 wellhead vault. None of the water leaked <br /> onto the access road adjacent to EW-2. The sample port at EW-2 was replaced. The GTF was <br /> shut down on May 16,2007, to investigate the cause of the extraction well cycling. An <br /> electrician visited the GTF on May 17,2007, and restarted the plant.The electrician checked <br /> the wiring,relays, and contacts at the main plant and both extraction wells.The electrician <br /> observed intermittent cycling of the extraction wells,and determined that the cycling was <br /> caused by a problem with radio transmission and reception. The cycling was not caused by <br /> an electrical control problem or poor electrical connections.The GTF was shut down on May <br /> 17,2007,for further investigation. <br /> The electrician contacted the radio control manufacturer for technical support,and then <br /> visited the GTF on May 21, 2007,to perform additional troubleshooting. The electrician did <br /> not observe cycling of the extraction wells while onsite. The electrician confirmed that there <br /> was no physical cause for the extraction well cycling (e.g.,faulty equipment or crossed <br /> wires). Instead, the electrician determined that the cycling was caused by external <br /> interference with reception of radio signals at the extraction wells.The GTF continued <br /> operating on May 21,2007. <br /> The extraction well cycling issue was discussed with Geo-Logic Associates (Geo-Logic) on <br /> May 22,2007. Geo-Logic operates a remote,radio-controlled meteorological monitoring <br /> station on the north slope of the former Austin Road Landfill.The station is located above <br /> the line-of-sight used by the GTF radio controls.Geo-Logic accesses their local radio receiver <br /> using a telephone landline, and downloads data from the meteorological station using radio <br /> transmissions. However,Geo-Logic reported that they have been unable to communicate <br /> RDD1071990021(NLH3536.DOC) 2 <br />