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0 <br />Collected LFG is combusted in a temperature controlled flare in accordance with the AQMD <br />permit (Appendix A). Use of LFG is not contemplated at this time <br />5.7 ENVIRONMENTAL MONITORING <br />Water quality is monitored consistent with WDR Order No. R5-2010-0016 (Appendix A). The <br />groundwater monitoring well network consists of five groundwater monitoring wells (Plate 6). <br />Surface water (when flowing) is monitored at surface water monitoring points shown in the <br />WDRs. Leachate seepage from the landfill is monitored at five unsaturated zone points. Off-site <br />migration of LFG is monitored at perimeter migration monitoring wells (Plate 6) in accordance <br />with the Methane Monitoring Program (Appendix 1). <br />5.8 FINAL GRADING PLAN <br />The proposed final landfill configuration reflects the maximum fill elevation of 320 ft msl <br />(Appendix B, Drawing 1). The height of fill over existing Modules 1 through 4 is constrained by <br />the materials used in the construction of the LCRS of those modules. <br />Final grades will be constructed with slopes no steeper than 3:1 (horizontal: vertical) to reduce <br />erosion, and with a minimum slope of 3 percent to provide sufficient slope for storm water runoff <br />after refuse consolidation and settlement. The 3:1 slopes will be constructed with 15 -foot <br />minimum width benches to limit landfill slope lengths and to provide for surface runoff without <br />promoting excessive erosion. <br />The cover will be designed to meet Title 27 prescriptive standards or an approved engineered <br />alternative. An alternative covers may include an evapo-transporative cover if so approved by the <br />regulators at the time of closure. <br />The final design will include a system of surface drainage facilities to control storm water run-on <br />and runoff during construction and operation, and after completion of the landfill. These facilities <br />will consist of ditches, culverts, and oversize drains. The project design will address erosion <br />issues by limiting water velocities and using erosion control structures (down drains, etc) where <br />North County RC&SL Page 29 of 69 Public Works/Solid Waste <br />Joint Technical Document County of San Joaquin — February 10, 2010 <br />