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Water Quality Monitoring Report Forward Landfill also measured above its PQL in the sample collected from well 8106-A. In addition, trace concentrations of 1,1-dichloroethene and cis-1,2-dichloroethene were measured in well 8106-A and DCDFM in well 7898-A. 3.1.8 Vadose Zone Monitoring The current vadose-zone monitoring network at the Austin Unit consists of seven lysimeters. The lysimeter locations are shown on Figure 3-1. As shown on Table 2-5A, with the exception of FU-04W all of the lysimeters were reported dry, and there was insufficient soil-pore liquid ( 7 milliliters)from FU-04W for analysis. 3.1.9 Leachate/Surface Impoundment Monitoring 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 (West) for evaporation. During the first quarter 2015, leachate was observed at holding areas WMU FU-03, WMU FU-04, WMU FU-05, WMU FU-06, WMU FU-10, WMU FU-13, and WMU FU-14 and a total of 113,650 gallons of leachate was removed from the lined areas at an average rate of 1,249 gallons per day. For surface impoundment WMU-F (West) freeboard ranged from approximately 5.25 to 5.50 feet during the first quarter 2015 monitoring period. Appendix A presents copies of the leachate observation logs, freeboard observation logs, and surface impoundment monitoring log. Leachate samples were collected on a quarterly basis and analyzed in the field for pH, specific conductance, temperature, and turbidity. The results of quarterly field monitoring measurements for the first quarter 2015 are presented in Table 3-7. 3.1.10 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 to surface water during the reporting period. Surface water monitoring stations ASW-1 (upstream) and ASW-2 (downstream) were sampled on February 18, 2015 for the first quarter 2015 monitoring period. Table 3-8 summarizes the current analytical results of surface water samples collected at the Austin Unit. As shown on Table 3-8, the CL for sulfate was exceeded in both upgradient and downgradient surface water monitoring stations, however, no VOCs were detected. The similar concentration of sulfate measured in the upstream sample suggests that the elevated sulfate is a background condition. M:\2015.0014\FA 1Q15.docx 12 4/27/2015,Rev.0