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5.2 DRAINAGE <br /> The drainage patterns will not be significantly changed by the closure cap <br /> extension; therefore, the monitoring and maintenance requirements for drainage <br /> will not significantly change from those identified in the original Postclosure <br /> Maintenance Plan of 1992. <br /> 5.3 VEGETATIVE COVER <br /> The monitoring and maintenance requirements for the vegetative cover will not <br /> significantly change from those identified in the original Postclosure <br /> Maintenance Plan of 1992, except that the surface to be monitored and <br /> maintained has increased by approximately 12% by the closure cap extension. <br /> 5.4 LEACHATE <br /> The monitoring and maintenance requirements for leachate will not significantly <br /> change from those identified in the original Postclosure Maintenance Plan of <br /> 1992. <br /> 5.5 LANDFILL GAS <br /> 5.5.A Landfill Gas Monitoring <br /> The monitoring and maintenance requirements for landfill gas migration <br /> monitoring will not significantly change from those identified in the original <br /> Postclosure Maintenance Plan of 1992. <br /> 5.5.13 Landfill Gas Collection <br /> The LFG collection system was not included in the Postclosure <br /> Maintenance Plan of 1992. See appendix G for the operation and <br /> maintenance plan for the LFG collection control system. These costs are <br /> included in Table 1. <br /> ' 5.6 GROUNDWATER <br /> The requirements for groundwater monitoring and maintenance will not <br /> significantly change from those identified in the original Postclosure <br /> Maintenance Plan of 1992. The postclosure maintenance costs (Table 1) reflect <br /> the groundwater monitoring system in place at the time of this addendum. <br /> Postclosure Maintenance Plan Addendum San Joaquin County <br /> Corral Hollow Sanitary Landfill 5 Department of Public Works <br /> Revised October 6,2011 Solid Waste Division <br />