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FIRST QUARTER 2007 GROUNDWATER TREATMENT FACILITY MONITORING REPORT FORWARD LANDFILL WDR ORDER NO.R5-2003-0080 The electrician is scheduled to replace the backup battery at EW-2,replace the control power circuit breakers at both extraction wells,and rewire the extraction well power supplies during the week of April 2,2007.The electrician will also replace the flow totalizer backup batteries at EW-1 and the main plant as preventive maintenance. During an inspection of the GTF on March 21,2007,EW-2 was observed to be cycling on and off. Shortly thereafter,water began Ieaking out of the wellhead vault at EW-2. On March 21,2007, EW-2 was shut off and the gate valve adjacent to EW-1 was closed to isolate the conveyance pipeline between EW-1 and EW-2. The CV Water Board was informed of the leak via e-mail on March 21,2007(Burke,2007,personal communication). EW-1 and the GTF continued operating until a power outage occurred on March 23,2007.The cause of the outage is unknown. The GTF was restarted on March 26,2007, and operated with EW-1 on and EW-2 off until the end of the quarter. The wellhead piping at EW-2 was inspected on March 29,2007. The leak was caused by a cracked check valve inside the wellhead vault. Repairs to the wellhead piping at EW-2 are scheduled for the week of April 2,2007. The wellhead check valve will be replaced. All flange gaskets inside the wellhead vault will also be replaced as preventive maintenance. Following the repairs,a brief operational test of EW-2 will be performed and the wellhead piping will be thoroughly examined for leaks. Electrical troubleshooting will be performed during the week of April 2,2007,to determine why the EW-2 pump cycles on and off. After all electrical and mechanical repairs are completed, EW-2 and the GTF will be returned to normal operation during second quarter 2007. 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 first quarter 2007. Figure 1 shows the effluent monitoring location. Table 2 presents the results of the effluent monitoring performed during first quarter 2007. Appendix A contains the effluent monitoring field sampling logs and laboratory results for first quarter 2007. The current WDRs stipulate that the concentration limit for VOCs in the effluent is non- detect. No VOCs were detected in the GTF effluent samples collected during first quarter 2007. Under WDR Order No. R5-2003-0080,influent sampling for pH,specific conductivity, turbidity, and VOCs are performed semiannually. Influent samples are collected from a sample port in the header pipe adjacent to the air stripper. Semiannual influent monitoring was not performed during first quarter 2007. RDDI071060007(NLH3445.DOC) 3