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Water Quality Monitoring Report Forward Landfill an average rate of 7,633 gallons per day. For surface impoundment WMU-F (West) Freeboard ranged from approximately 4.1 to 10.0 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 are collected on a quarterly basis and analyzed in the field for pH, specific conductance, temperature, and turbidity. The results of quarterly field monitoring measurements results for the second quarter 2017 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, no stormwater was discharged to surface water (North Little Johns Creek) during the reporting period. Surface water monitoring stations ASW -1 (upstream) and ASW -2 (downstream) were sampled on April 28, 2017 for the second quarter 2017 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, similar concentrations were measured in both up and downstream samples and no VOCs were detected in either sample. Furthermore, no CLs were exceeded at downstream point ASW -2. Is 3.1.11 Corrective Action Monitoring The Groundwater Treatment Facility (GTF) at the Austin Unit has been operational since 1994 to mitigate impacts from landfill releases. Impacted groundwater is extracted from four wells (EW -1, EW -2, EW -311, and EW -4) that pump groundwater through an air stripper treatment system to remove VOCs. Treated groundwater is discharged to an infiltration pond (constructed in 2003) north of the Austin Road Unit of the Forward Landfill. During the monitoring period, the GTF treated 15.9 million gallons of groundwater and removed approximately 0.23 pounds of VOCs. Details regarding corrective action remediation system operations and performance evaluation for the second quarter 2017 are presented in Appendix C. C 3.2 Summary Groundwater quality conditions beneath the Austin Unit during the second quarter 2017 monitoring period indicates that CL exceedances and/or non -statistical indication of release were identified at DMP wells AMW-6 and AMW-12 during the second quarter 2017 monitoring period. The PCE concentration measured at DMP well AMW-12 (6.6 ug/L) exceeded the state and federal MCL (5.0 ug/L) and also exhibited an increasing trend. In a letter dated July 31, 2017, the RWQCB was notified of the CL exceedances in wells AMW-6 and AMW-12. For the CAP/evaluation wells, 17 of 28 wells reported one or more VOCs exceeding a PQL, with CAP well AMW-22S having the highest total concentration of VOCs (94.46 µg/L). Surface water samples collected from the upstream and downstream surface water monitoring stations Project No. 5017.1030 1 Water Quality Monitoring Report 13 July 2017