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Water Quality Monitoring Report Forward Landfill C] 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, potassium, sodium, strontium at well MW -10; carbon tetrachloride at well MW -17; potassium and sodium at well MW -18; potassium at well MW -19; and potassium 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, no samples were collected from suction or pan lysimeters because they were reported dry or there was an insufficient volume of soil -pore liquid (5 ml). 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 second quarter 2017, leachate was observed at holding areas WMU D-93/94, WMU D-01N/S, and WMU D-02 and a total of 285,700 gallons of leachate was removed from the lined areas at an average rate of 3,140 gallons per day. For surface impoundment WMU-F (North), freeboard ranged from approximately 2.3 to 4.0 feet during the second 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 second 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. Surface water monitoring stations FSW-1 (downstream) and FSW-2 (upstream) were sampled on April 28, 2017 for the second quarter 2017 monitoring period. Table 2-8 summarizes the current analytical results of surface water samples collected at the Forward Unit. As shown on Table 2-8, similar concentrations were measured in both up and Project No. 5017.1030 I water Quality Monitoring Report 8 July 2017