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THIRD QUARTER 2006 GROUNDWATER TREATMENT FACILITY MONITORING REPORT FORWARD LANDFILL WDR ORDER NO.R5-2003-0080 TABLE 2 Effluent Monitoring Results Third Quarter 2006 Groundwater Treatment Facility Monitoring Report,Forward Landfill WDR Order No.R5-2003-0080 Analysis Date Parameters Units Results Field Parametersa 7/13/06 pH pH units 7.9 Conductivity µmhos/cm 726 8/11/06 pH pH units 8.0 Conductivity µmhos/cm 970 9/11/06 pH pH units 7.9 Conductivity µmhos/cm 935 Laboratory Analyses° 7/13/06` PCE pg/L 0.25 J° All other VOCs µg/L Nondetect Total dissolved solids milligrams per liter 641 8/11/06` All VOCs µg/L Nondetect 9/15/06` All VOCs µg/L Nondetect aField parameters were analyzed using a calibrated Horiba U-10 water quality meter. b/OCS were analyzed using U.S. Environmental Protection Agency Method SW826013.Total dissolved solids were analyzed using U.S.Environmental Protection Agency Method 160.1. `Both extraction wells were operational when this sample was collected. dThe method detection limit and practical quantitation limit for PCE are 0.15 and 0.5µg/L,respectively. Notes: J = estimated value pg/L = micrograms per liter µmhos/cm = micromhos per centimeter The current WDRs stipulate that the concentration limit for VOCs in the effluent is non- detect. PCE was detected in the effluent sample collected on July 13,2006, at a concentration (0.25 J µg/L) slightly above the detection limit(0.15 µg/L), and,in response,the GTF was shut down on August 9,2006.The PCE detection appeared to be anomalous and might have resulted from cross contamination during sample collection,transport,or analysis. Between June 1999 and July 2006,PCE was detected only once in the GTF effluent in November 2003. The November 2003 detection resulted from sample contamination. After discussions with the CV Water Board,the GTF was restarted on August 10,2006,to collect a confirmation effluent sample (Atkinson,2006a). After the plant operated for approximately 25 hours,the GTF effluent was sampled on August 11, 2006.The GTF was then shut down,and the sample was analyzed using a 48-hour turnaround time. No VOCs were detected in the August effluent sample,and the GTF was restarted on August 15,2006, with permission from the CV Water Board. No VOCs were detected in the GTF effluent sample collected on September 15,2006. Under WDR Order No.R5-2003-0080,influent sampling for pH,specific conductivity, turbidity,and VOCs is performed semiannually.Influent samples are collected from a RDD/062900002(CAH3610.DOC) 3