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Water Quality Monitoring Report Forward Landfill 4.0 ANNUAL SUMMARY 4.1 General During the 2017 monitoring year, groundwater elevations and groundwater and surface water sampling was performed at the Forward Landfill on a quarterly basis. The groundwater and surface water samples were analyzed for the monitoring parameters summarized in Table 2-1, and a tabular summary of the 2017 annual monitoring data is provided in Appendix F and electronically in Excel (submitted to the RWQCB via email). Time-series plots and piper diagrams depicting groundwater and surface water constituent concentrations are presented in Appendix G. In addition, well hydrographs illustrating historical groundwater elevations, well screen elevations, and pump intake elevations are also included in Appendix G. According to the Forward Landfill Operations Manager, Forward Landfill received a total of 864,637 tons of solid waste during the 2017 monitoring year. Figure 1-2 shows the approximate location of waste placement during 2017 monitoring year. In addition, the compost facility received 68,829 tons of green waste and produced 16,841 tons of compost. 4.2 Landfill Gas Monitoring The SCS performs quarterly inspections at the Forward Landfill for methane concentrations in perimeter soil-pore gas probes. During the 2017 monitoring year no Title 27 perimeter gas probes exceeded the regulatory limit of 5 percent at the Forward Landfill and no on-site structures were in excess of 1.25 percent by volume in air. In accordance with CCR 27, Section 20937(a) (1), methane monitors are installed in all buildings at the site to protect public health and safety and the environment. During the 2017 monitoring year, no methane was reported in any of the facilities buildings. 4.3 Compliance Record No NOVs were issued by CEHD or CalRecycle during the 2017 monitoring year. 4.4 Forward Unit 4.4.1 Groundwater Groundwater elevations measured during the 2017 monitoring year were variable, reflecting seasonal precipitation patterns. The variable pattern in groundwater elevations in 2017 mimics annual patterns over the monitoring history. Hydrographs depicting historical groundwater elevations are presented in Appendix G and indicate generally static trends. During the 2017 monitoring year,the groundwater flow beneath the north-northeastern portion of the Forward Unit flows to the east-northeast, while groundwater beneath the southern and central portions of the Forward Unit generally flows to the south to southeast. The south-southeast gradient is believed to be related to groundwater pumping of nearby agricultural wells. Regionally the groundwater gradient is to north and northeast toward the Austin Unit. Project No.5017.1030 I Water Quality Monitoring Report 14 January 2018