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FOURTH QUARTER 2006 GROUNDWATER TREATMENT FACILITY MONITORING REPORT FORWARD LANDFILL WDR ORDER NO.R5-2003-0080 conveyance pipe adjacent to the wet area in the access road.The wet area was marked with a stake and flagging tape.The CV Water Board was informed of the leak via e-mail on December 20,2006 (Atkinson,2006). EW-1 and the GTF continued to operate until the end of fourth quarter 2006. Repairs to the groundwater conveyance pipeline are scheduled for the week of January 8,2007. Following the repairs,EW-2 will be restarted and the repaired pipe will be thoroughly examined for leaks.After the pipeline is successfully repaired,EW-2 and the GTF will be returned to normal operation during first quarter 2007. The GTF hour meter failed during fourth quarter 2006 and will be repaired or replaced during first 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 were analyzed during fourth quarter 2006. Figure 1 shows the effluent monitoring location. Table 2 presents the results of the effluent monitoring performed during fourth quarter 2006. Appendix A contains the effluent monitoring field sampling logs and laboratory results for fourth quarter 2006. The current WDRs stipulate that the concentration limit for VOCs in the effluent is nondetect. No VOCs were detected in the GTF effluent samples collected during fourth quarter 2006. 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 conducted on November 16,2006. Table 3 presents the results of the influent monitor- ing performed during fourth quarter 2006. Appendix A contains the influent monitoring field sampling logs and laboratory results for fourth quarter 2006. As required by the current WDRs,historical influent and effluent analytical results (detected analytes only) are tabulated on a compact disc in Appendix B. Appendix B also contains historical influent and effluent pH and conductivity data. The Appendix B data cover the period from August 1994 to December 2006. The results are drawn from a CH2M HILL database and historical reports. During first quarter 2007, effluent samples will be collected monthly and analyzed for pH, specific conductivity,and VOCs.One quarterly effluent sample will be analyzed for total dissolved solids. Influent samples will again be collected during second quarter 2007. RDD/070170002(NLH3358.DOC) 3