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temporal trends were calculated for barium and chloride concentrations in wells AMW- 12 and AMW-14. In the CAP wells,trend analyses are performed instead of comparison to CLs. During the current monitoring period, statistically significant increasing trends were noted for three VOCs in CAP well AMW-1,while decreasing VOC trends were noted for one or more VOCs in CAP wells AMW-1, AMW-4,AMW-10,AMW-11, and AMW-19BR. The decreasing(organic and inorganic)trends noted in most of the CAP wells, suggests that corrective action measures have been successful in reducing facility related groundwater impacts downgradient of the Austin Unit. Surface water samples dry during the current monitoring period. 4.0 ANNUAL SUMMARY 4.1 GENERAL During the 2013 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 2013 annual monitoring data is provided in Appendix C,which includes the five-year COC sampling event performed during the first quarter 2013. Time-series plots and stiff diagrams depicting groundwater and surface water constituent concentrations, are presented in Appendix D. In addition, well hydrographs illustrating historical groundwater elevations,well screen elevations, ® and pump intake elevations are also included in Appendix D. According to the Forward Landfill Operations Manager,Forward Landfill received a total of 792,125 tons of solid waste during the 2013 monitoring year. Figure 1-2 shows the approximate location of waste placement during 2013 monitoring year. The following types of waste were received: Non-hazardous solid waste—776,316 tons Asbestos—2,991 tons Sewage and wastewater treatment sludge— 12,818 tons 4.2 LANDFILL GAS MONITORING The CEHD performs monthly inspections at the Forward Landfill for methane concentrations in perimeter soil-pore gas probes. No perimeter gas probes exceeded the regulatory limit of 5 percent at the Forward Landfill during the 2013 monitoring year. 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 2013 monitoring year, no methane was detected in any of the facilities buildings. CA2013-0021\FA_4Q13.dm 13 Geo-Logic Associates