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n Collected LFG is combusted in a temperature controlled flare in accordance with the AQMD permit (Appendix A). Use of LFG is not contemplated at this time. 5.7 ENVIRONMENTAL MONITORING Water quality is monitored consistent with WDR Order No. R5-2010-0016 (Appendix A). The groundwater monitoring well network presently consists of five groundwater monitoring wells (Plate 6). Surface water (when flowing) is monitored at surface water monitoring points (WDRs and Plate 6). Leachate seepage from the landfill is monitored at five unsaturated zone points. Off-site migration of LFG is monitored at perimeter migration monitoring wells (Plate 6) in accordance with the Methane Monitoring Program (Appendix 1). 5.8 FINAL GRADING PLAN The proposed final landfill grading plan reflects the maximum fill elevation of 320 ft MSL IS (Appendix B Drawing 1). The height of fill over existing Areas 1 through 4 is constrained by the materials used in the construction of the LCRS of those areas. Unless otherwise approved, the final grades will be constructed with slopes no steeper than 3:1 (horizontal: vertical) to reduce erosion and for slope stability. 3:1 slopes will be constructed with 15 -foot minimum width benches to limit landfill slope lengths and to provide for surface runoff without promoting excessive erosion. Surfaces will be provided with a minimum 3 percent slope to provide sufficient slope for storm water runoff after refuse consolidation and settlement. The cover will be designed to meet Title 27 prescriptive standards or an approved engineered alternative. An alternative covers may include an evapo-transporative cover if so approved by the regulators at the time of closure. The final design will include a system of surface drainage facilities to control storm water run-on and runoff during construction and operation, and after completion of the landfill. These facilities will consist of ditches, culverts, down -coming drains and benches. The design will address erosion issues by limiting water velocities and using erosion control structures (down drains, etc.) where necessary. . North County RC&SL Page 29 of 68 Public Works/Solid Waste Joint Technical Document County of San Joaquin — October 10, 2014