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Water Quality Monitoring Report Forward Landfill Tracking Mode Constituent concentrations reported above a CL within the previous three years of monitoring were placed in "Tracking Mode" and are evaluated for temporal trends using Mann-Kendall trend analyses. The results of the trend analyses indicate that increasing trends were calculated for barium, bicarbonate, calcium, magnesium, and potassium at well MW-10; carbon tetrachloride and TCFM at well MW-17; sodium at well MW-18; and sodium at well MW-24 (Table 2-5). Mann-Kendall trend analyses calculations are presented in Appendix G. 2.1.5 Vadose Zone Monitoring The current vadose-zone monitoring network at the Forward Unit consists of 10 lysimeters (seven suction lysimeters and three pan lysimeters). These lysimeter locations are shown on Figure 2-1. As shown on Table 2-6A, samples were collected from suction lysimeters W-2, LY-A, and LY-BG-1. The remaining lysimeters were reported dry during the monitoring period. As shown in Table 2-613, a quantifiable concentration of t-butyl alcohol was measured in the soil- pore liquid sample collected from background lysimeter LY-BG-1. 2.1.6 Leachate/Surface Impoundment Monitoring For the Forward Unit, leachate sumps and surface impoundments are inspected weekly by Forward Landfill personnel. If leachate is detected in a sump, it is pumped into the surface impoundment WMU F (North) for evaporation. During the third quarter 2017, leachate was observed at holding areas WMU D-93/95, WMU D-01N/S, and WMU D-02 and a total of 138,663 gallons of leachate was removed from the lined areas at an average rate of 1,507 gallons per day. For surface impoundment WMU-F (North), freeboard ranged from approximately 4.1 to 12.3 feet during the third quarter 2017 monitoring period. Appendix A presents copies of the leachate observation logs, freeboard observation logs, and surface impoundment monitoring log. Leachate samples from Forward Unit and Compost Area retention basins are analyzed in the field for pH, specific conductance, temperature, and turbidity on a quarterly basis. Results of quarterly field monitoring measurements for the third quarter 2017 are presented in Table 2-7. 2.1.7 Surface Water Monitoring Site run-on and run-off control facilities are designed to effectively channel surface water to site stormwater/sedimentation ponds. According to the Operations Manager, there were no discharges from the Forward Unit to surface water (waters of the United States) during the reporting period. During the monitoring period, surface water monitoring stations FSW-1 (downstream) and FSW-2 (upstream) were reported dry. Inspections for surface water were performed on July 8, July 25, August 15, August 31, September 13, September 27, 2017 for the third quarter 2017 monitoring period (Appendix C). Project No.5017.1030 I Water Quality Monitoring Report 8 October 2017