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Water Quality Monitoring Report Forward Landfill 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 (waters of the United States) during the reporting period. Surface water monitoring stations ASW-1 (upstream) and ASW-2 (downstream) were reported dry during multiple inspections for the fourth quarter 2017 monitoring period. Bimonthly inspections for surface water were performed by Del-Tech on October 9, October 27, November 13, November 30, December 14, and December 30, 2017 for the fourth quarter 2017 monitoring period (Appendix Q. 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-3R, 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 Unit of the Forward Landfill. During the monitoring period, the GTF treated 25.9 million gallons of groundwater and removed approximately 0.70 pounds of VOCs. Details regarding corrective action remediation system operations and performance evaluation for the fourth quarter 2017 are presented in Appendix C. 3.1.12 Hazardous Waste Monitoring In accordance with Water Code Section 13267 Order for Technical Reports Regarding Acceptance of Hazardous Waste, Forward Landfill, San Joaquin County, dated May 16, 2017, groundwater monitoring wells AMW-1, AMW-2, AMW-4, AMW-7, and leachate sumps FU-04, FU-06, FU-08, FU-13/14 were analyzed for additional dissolved inorganic/metals. The results of these additional analyses are presented in Table 3-8. 3.2 Summary Groundwater quality conditions beneath the Austin Unit during the fourth quarter 2017 monitoring period were generally similar to historical results. Concentration limit exceedances and/or non-statistical indication of release were identified at DMP wells AMW-5R, AMW-6, AMW-12 during the fourth quarter 2017 monitoring period. It is recognized that well AMW-6 should have been identified as a CAP well in the M&RP. For the CAP/evaluation wells, 18 of 29 wells reported one or more VOCs exceeding a PQL, with CAP wells AMW-1 and AMW-22S having the greatest number and highest total concentration of VOCs. All surface water stations and lysimeters were reported dry or there was an insufficient volume of soil-pore liquid for analysis during the fourth quarter 2017 monitoring period. Under the existing CAP, the GTF pumped 25.9 million gallons of groundwater removing an estimated 0.7 pounds of VOCs. Project No.5017.1030 I Water Quality Monitoring Report 13 January 2018