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5.5.B Landfill Gas Collection <br /> The LFG collection system was not included in the Postclosure <br /> Maintenance Plan of 1992 because it was installed in 2001. The LFG <br /> system is currently operated according to the operation and maintenance <br /> plan (Appendix C). Postclosure maintenance costs reflect the operation <br /> and maintenance of this system, including improvements made during <br /> closure. <br /> 5.6 GROUNDWATER <br /> Three off-siteroundwater migration wells were installed in 2012. Costs to <br /> 9 9 <br /> maintain these wells are included in the revised postclosure maintenance cost <br /> estimate. <br /> 5.7 FINAL GRADING <br /> The requirements for final grading monitoring and maintenance will not <br /> significantly change from those identified in the original Postclosure Maintenance <br /> Plan of 1992. <br /> 5.8 VAOSE ZONE <br /> The requirements for Vadose zone monitoring and maintenance will not change <br /> from those identified in the original Postclosure Maintenance Plan of 1992. <br /> ' 6.0 EMERGENCY RESPONSE PLAN <br /> The emergency response requirements have not significantly changed from those <br /> identified in the original Postclosure Maintenance Plan of 1992. <br /> Postclosure Maintenance Plan Addendum San Joaquin County <br /> Corral Hollow Sanitary Landfill Department of Public Works <br /> October 26,2012 6 Solid Waste Division <br />