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THIRD QUARTER 2007 GROUNDWATER TREATMENT FACILITY MONITORING REPORT FORWARD LANDFILL WDR ORDER NO.R5-2003-0080 2.0 Operational Summary The GTF operated for 1,947 hours between July 1 and September 30,2007,at 88.2 percent uptime, and treated 24.158 million gallons of groundwater at an average flow rate of 207 gallons per minute, or 0.298 million gallons per day. During this period,the GTF removed approximately 3.4 pounds of VOCs.Table 1 presents the monthly average effluent flow rates in gallons per day. TABLE 1 Monthly Average Effluent Flow Rates Third Quarter 2007 Groundwater Treatment Facility Monitoring Report, Forward Landfill WEIR Order No.R5-2003-0080 Average Flow Rate Month (gallons per day) July 295,000 August 254,000 September 347,000 At the beginning of third quarter 2007,EW-1 was operational,and the effluent was discharging to the infiltration pond. EW-2 was found to be inoperable during a site visit on July 2, 2007. An electrician visited the GTF on July 2,2007,and discovered that the voltage monitor relay at EW-2 was disconnected.The electrician reinstalled the voltage monitor relay and restarted EW-2. The GTF was shut down on July 10,2007, and the air stripper packing material and sump were acid washed between July 11 and 12,2007.This routine maintenance procedure removes mineral deposits,thereby improving the efficiency of the treatment system.The packing and sump were inspected on July 12 and 13,2007,and found to be free of mineral deposits. The effluent from the acid wash was neutralized,buffered, and stored in a holding tank onsite.The pH of the acid wash effluent was measured on July 13 and July 18, 2007, and found to meet the requirements of the City of Stockton Regional Wastewater Control Facility. The neutralized,buffered acid wash effluent was disposed of at the City of Stockton Regional Wastewater Control Facility on July 18,2007. The GTF was restarted on July 13,2007. Approximately 7 minutes after the restart, the sample port at EW-1 was found to be partially open and was immediately closed. Water leaked from the sample port into the valve vault at EW-1 and onto the access road adjacent to EW-1. None of the leaking water entered the stormwater ditch opposite EW-1 or entered Littlejohns Creek. On July 16,2007,water was observed leaking from the air stripper sump sight glass onto the concrete containment pad.The GTF was shut down to inspect the sight glass assembly,and the union connecting the sight glass to the air stripper sump was found to be cracked. Approximately 5 gallons of treated groundwater leaked onto the containment pad and drained into the containment pad sump.The union was replaced and the GTF was restarted on July 16,2007. An electrician visited the GTF on July 25,2007 to install new flow sensor paddles at EW-1 and EW-2,adjust the air stripper blower,and install new radio equipment to eliminate RDDI072830006(CLR3709.DOC) 2