ARCHIVED REPORTS_2007_12 - Laserfiche WebLink

Home Browse Search

FIRST QUARTER 2007 GROUNDWATER TREATMENT FACILITY MONITORING REPORT FORWARD LANDFILL WDR ORDER NO.R5-2003-0080 TABLE 1 Monthly Average Effluent Flow Rates First Quarter 2007 Groundwater Treatment Facility Monitoring Report, Forward Landfill WEIR Order No.R5-2003-0080 Average Flow Rate Month (gallons per day) January 255,000 February 294,000 March 292,000 At the beginning of first quarter 2007,EW-1 was operational,and the effluent was discharging to the infiltration pond. EW-2 was shut off on December 20,2006,because of a leak in the buried groundwater conveyance pipeline approximately 400 to 450 feet east of EW-2. The leak was located beneath an asphalt drainage channel that runs down the north slope of the former Austin Road Landfill. The conveyance pipeline between EW-1 and EW-2 was isolated on December 20,2006. The groundwater conveyance pipeline was excavated and exposed on the east and west sides of the asphalt drainage channel on January 8,2007.The pipeline was repaired on January 9,2007. A horizontal 4-inch Schedule 80 PVC pipe segment was installed above the landfill slope to avoid disturbing the asphalt drainage channel during the winter. The aboveground pipe is temporary and will remain in place until late spring or early summer, when it will be replaced with buried PVC pipe. The repaired pipeline was successfully leak- tested on January 11,2007,by first operating EW-2 only,and then by operating both extraction wells simultaneously. No leaks were observed,and the GTF, EW-1, and EW-2 continued operating. The GTF was shut down for several hours on January 16,2007,to repair the plant hour meter,install new valves at the GTF pressure gauges, and draw an electrical schematic of the GTF main control panel. The GTF was briefly shut down on February 1,2007,to install liquid-filled pressure gauges at both extraction wells and remount the plant hour meter on the exterior of the GTF main control panel. During a site visit on February 16, 2007,EW-2 was off because a voltage monitor relay was unplugged inside the wellhead control panel. After the relay was plugged in, EW-2 was restarted and operated normally. During a site visit on March 5,2007,EW-1 was not operating; the cause of the shutdown is unknown. EW-1 was restarted on March 5 and operated normally. In addition, EW-2 cycled on and off for several seconds,then operated normally during further observation.The cause of the cycling was not immediately known. An electrician visited the GTF on March 19,2007,to recalibrate the flow meters at EW-1 and EW-2.The electrician determined that the main plant flow meter did not require recalibration. The electrician found that the backup battery inside the EW-2 flow totalizer required replacement.The electrician also identified the following issues at EW-1 and EW-2: • The circuit breaker feeding the control power transformer is not rated for the voltage supplying the well, and must be replaced. ® The power supply feeding the control power transformer is tapped ahead of the exterior control panel disconnect. When the disconnect is off and the panel door is open, live electrical wires are energized with 480 volt and 120 volt power,creating an electrical hazard that must be corrected. RDD/071060007(NLH3445.DOC) 2