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• REsPERUvBL'C ICES Mr. Brendan Kenny Engineering Geologist Central Valley Regional Water Quality Control Board 11020 Sun Center Drive, Suite 200 Rancho Cordova, CA 95670 October 24, 2017 RE: Forward Landfill—Third Quarter 2017 Dear Mr. Kenny: In accordance with WDR Order No. R5-2014-0006, Forward Incorporated (Forward) is pleased to submit this Third Quarter 2017 Monitoring Report for the Forward Landfill. Included in this report are the results of groundwater, surface water, and vadose zone monitoring. In addition this report presents a summary of monitoring of facility operations including cannery waste monitoring, leachate extraction, LFG extraction, and additional monitoring in accordance with Water Code Section 13267 Order for Technical Reports Regarding Acceptance of Hazardous Waste. • According to the Forward Landfill Operations Manager, standard observations have been conducted weekly during the reporting quarter. The Forward Landfill Operations Manager also reported that no surface water was discharged from the facility during the monitoring period. During the third quarter 2017 monitoring period, no notices of violation (NOVs) were issued by the San Joaquin County Environmental Health Department. For the Forward Unit, water quality monitoring for the third quarter 2017 indicated a non-statistical indication of release at well MW-2A as a result of three volatile organic compounds (VOCs) measured at trace concentrations; at well MW-16 as a result of one VOC measured at a quantifiable concentration; and at well MW-17 as a result of three VOCs measured at quantifiable concentrations and four VOCs measured at trace concentrations. Of note, these organic constituents have been previously confirmed and are currently in "Tracking Mode". For the inorganic monitoring parameters, concentration limits(CLs) were exceeded at wells MWA 0, MWA 5, MWA 7, MWA 8, MW-19, and MW-24. All of the inorganic CL exceedances were placed in "Tracking Mode" and are being evaluated for temporal trends. For constituent concentrations in "Tracking Mode", increasing trends were calculated for barium, bicarbonate, calcium, magnesium, and potassium at well MW-10; carbon tetrachloride and trichlorofluoromethane at well MW-17; sodium at well MW-18; and sodium at well MW-24. The surface water monitoring stations were inspected multiple times, but were dry each time and therefore could not be sampled. For vadose zone monitoring stations soil-pore liquid samples were collected from W-2, LY-A, and LY-BG-1 and a quantifiable concentration of t-butyl alcohol was measured in lysimeter LY-BG-1. For the Austin Unit, water quality monitoring for the third quarter 2017 indicated a CL exceedance and/or non-statistical indication of release at Detection Monitoring Program (DMP) wells AMW-6 and AMW-12 during the monitoring period, of which the tetrachloroethene concentration measured at DMP well AMW- 12 exhibited an increasing trend. In a letter dated October 17, 2017, the RWQCB was notified of the CL exceedances in wells AMW-6 and AMW-12. For the Corrective Action Program (CAP)/evaluation wells, 16 of 28 wells reported one or more VOCs exceeding a practical quantitation limit, with CAP well AMW- 22S having the highest total concentration of VOCs. Surface water samples collected from the upstream •