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SECOND QUARTER 2007 GROUNDWATER TREATMENT FACILITY MONITORING REPORT FORWARD LANDFILL WDR ORDER N0.R5-2003-0080 • Changing radio control frequencies to eliminate interference • Testing the use of different antennas at the transmitter and receivers to improve signal strength Results of the additional troubleshooting and repairs will be discussed in the Third Quarter 2007 Groundwater Treatment Facility Monitoring Report. 3.0 Influent and Effluent Monitoring Under WDR Order No. R5-2003-0080,effluent es are analyzed samples 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 second quarter 2007. Figure 1 shows the effluent monitoring location. Table 2 presents the results of the effluent monitoring performed during second quarter 2007. Appendix A contains the effluent monitoring field sampling logs and laboratory results for second quarter 2007. The current WDRs stipulate that the concentration limit for VOCs in the effluent is non- detect. Methylene chloride and PCE were detected in the effluent sample collected on May 1, 2007. PCE was detected at a concentration equal to the MDL (0.15 micrograms per liter [µg/LI). In response, the GTF was shut down on May 23,2007.The May effluent sample results were discussed with the analytical laboratory.The laboratory confirmed that methylene chloride was detected in an associated method blank sample at a concentration slightly less than the MDL, and determined that methylene chloride in the effluent sample most likely resulted from laboratory contamination. In addition, according to a review of historical data,the PCE detection appeared to be anomalous and nught have resulted from cross contamination during sample collection, transport, or analysis. The CV Water Board was informed of the May effluent sample results on May 23,2007 (Burke,2007,personal communication). After discussions with the CV Water Board, the GTF was restarted on May 24,2007,to collect a confirmation effluent sample. After the plant operated for approximately 27 hours, the GTF effluent was sampled on May 25,2007.The GTF was then shut down, and the sample was analyzed using a same-day turnaround time. No VOCs were detected in the May confirmation effluent sample, and the GTF was restarted on May 29, 2007,with permission from the CV Water Board. No VOCs were detected in the GTF effluent samples collected on April 6 and June 4,2007. 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 conducted on May 1,2007.Table 3 presents the results of the influent monitoring performed during second quarter 2007. Appendix A contains the influent monitoring field sampling logs and laboratory results for second quarter 2007. RDD/071990021(NLH3536.DOC) 4