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2.0 PRELIMINARY POST -CLOSURE MAINTENANCE PLAN AMENDMENT The 2002 Preliminary Plan prepared by BAS, Lewis Engineering, and GLA was updated with Amendment No. 4 of the PCPCMP. A copy of the updated post -closure maintenance cost estimate is included as Table 4 and matches the estimate presented in Amendment No. 4 of the 2002 PCPCMP. The FL will be closed in nine stages over the life of the landfill. Upon completion of closure construction activities and certification, partial closure post -closure monitoring and maintenance will begin. Post -closure monitoring and maintenance procedures are outlined in the 2002 PCPCMP. The following discussion presents items of special note which will be carried out during the post -closure maintenance period in support of each staged closure area where appropriate: Landfill Gas Control and Monitoring The landfill gas control system will be expanded as the FL is developed. Therefore, the gas control system will be placed prior to completion of each staged closure area. The system will be modified as discussed in this Amendment (Amendment No. 3) and the 2002 PCPCMP to accommodate placement of the final cover during Stage VII. Permanent gas migration monitoring probes have already been installed around the perimeter of the refuse footprint in accordance with 27 CCR. Additional probes may be added as necessary. Surface, subsurface and system monitoring and control system adjustments/ modifications will be conducted during post -closure maintenance to provide compliance with applicable regulations. Settlement Monitoring Two permanent survey monuments will be installed during closure of Stage I. An aerial survey will be conducted upon completion of each closure stage and once thereafter every five years during the post closure maintenance period to track settlement. If additional fill contour information is needed, it should be noted that aerial flyovers will be conducted annually throughout active refuse disposal operations. Stormwater Management As part of routine site maintenance, all stormwater control system features will be inspected and repaired as necessary. Special attention will be given to those interim and/or permanent stormwater control system features which divert, gather and/or control run-on to the staged closure areas. Drainage control system which features the final stage closure will be integrated with the interim features utilized during active operations. 11 SWT Engineering Forward Landfill - PCPCMP Amendment (Z:\PROJECTS\Al lied Waste\Forward\JN81013 5 yr Review Plan\JTD Amd 3 PCPCMP Amd 3 Dec 08\PCPCMP Amend 3 121808.doc; Amendment No. 3: 12/18/08)