ARCHIVED REPORTS 2ND QUARTER 2010

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• Summary water table elevation data tables for historical (Appendix B) and current (Table 4) conditions and analytical data tables for historical (Appendix C) and current (Table 6) conditions.' • Scaled maps showing relevant structures, features, and monitoring well locations (Figure 2). • Copies of laboratory analytical reports for groundwater sampling during Second Quarter 2010 (Appendix D). 2.0 GROUNDWATER MONITORING ACTIVITIES Personnel from FGL Environmental, Inc. performed the Second Quarter 2010 monitoring activities, which included water level measurements and well-water sampling. Monitoring well locations are shown in Figure 2. Consistent with the approved Monitoring and Reporting Program, water levels and water quality are monitored in all wells. All monitoring was done in accordance with the Monitoring and Reporting Program No. 5-01-251. 2.1 Groundwater Level Measurements Groundwater elevations relative to mean sea level (msl) (NAVD 88) were calculated by subtracting the depth to water from the elevation of the measurement point at each well. Water levels in the nine WWTF wells were measured by FGL Environmental, Inc. on May 3, 2010, and water levels in the four WRP-1 MBR wells were measured by HydroFocus, Inc. in compliance with the separate WDR Order No. R5-2006-0094 on April 21, 2010. All water levels were measured using water level sounders accurate to 0.01 foot. 2.2 Well Water Sample Collection and Analysis The monitoring wells were sampled by FGL Environmental, Inc. on May 3, 2010. The wells were purged and sampled using a Teflon submersible pump and vinyl discharge tubing2. The pump, tubing, and power cord were decontaminated prior to each use. Field parameters (pH, electrical conductivity, and temperature) were monitored using a YSI Model 556 multimeter and flow cell. Samples were collected after three casing volumes were purged from the well and field parameters stabilized. Purged water was disposed of at the well sites. Table 1 reports the calculated volume of each well casing and the number of casing volumes purged. Appendix A contains groundwater purging and sampling logs. Historical water level and water quality data compiled for this report provided by Veolia West Operating Services and FGL Environmental, Inc. Available historical data begins in Fourth Quarter 2002. 2 FGL Environmental, Inc. sampling protocol, written communication, July 31, 2009. - 6 -