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THIRD QUARTER 2006 GROUNDWATER TREATMENT FACILITY MONITORING REPORT FORWARD LANDFILL WDR ORDER NO.R5-2003-0080 At the beginning of third quarter 2006,both extraction wells were operational,and the effluent was discharging to the infiltration pond.The GTF was shut down for several hours on June 30,2006,to install new supports for the sump pump discharge pipe, and to install an additional sump pump discharge outlet equipped with a camlock hose fitting.The hose fitting allows liquid to be pumped from the sump into a tank or other container.The GTF was restarted on June 30,2006. On July 13,2006,the influent flowmeter located at the main control panel was malfunction- ing,although the GTF operated normally. Further inspection revealed that the influent paddle wheel flow sensor was missing.The paddle wheel sensor was replaced on July 20, 2006, and the flowmeter resumed normal operation. Using operating hours and the average influent flow rate between June 30 and July 20,2006,an estimated 5,582,906 gallons of groundwater were treated by the GTF during this period but not recorded by the influent totalizer.This additional volume of treated water was used to estimate the VOC mass removed during third quarter 2006.Additional components of the influent flow sensor were replaced on September 1,2006,as part of ongoing GTF maintenance. As discussed in Section 3.0,the GTF was shut off on August 9,2006,because PCE was detected at a low concentration in the effluent sample collected on July 13,2006. The GTF was restarted on August 10,2006,and a confirmation effluent sample was collected on August 11,2006.The GTF was then shut down.VOCs were not detected in the August 2006 effluent sample,and the GTF was restarted for continuous operation on August 15,2006. The blower damper was adjusted slightly on August 21,2006,to maximize air flow into the air stripper while maintaining the motor current within operating limits. Extraction well (EW)-1 was off on September 11,2006,and the cause of the shutdown is unknown. EW-1 was restarted and operated normally for the rest of the quarter.The GTF was shut down for approximately 1 hour on September 11,2006, to install a new rain hat at the top of the air stripper.The rain hat was successfully installed,and the GTF was restarted for continuous operation. 3.0 Influent and Effluent Monitoring Under WDR Order No. R5-2003-0080,effluent samples are analyzed as follows: • Monthly for pH,specific conductivity, and VOCs • Quarterly for total dissolved solids • Annually for dissolved inorganics All parameters other than dissolved inorganics were analyzed during third quarter 2006. Figure 1 (at the end of this report) shows the effluent monitoring location.Table 2 presents the results of the effluent monitoring performed during third quarter 2006. Appendix A contains the effluent monitoring field sampling logs and laboratory results for third quarter 2006. RDD/062900002(CAH3610.DOC) 2