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2-1 2.0 PRELIMINARY POST-CLOSURE MAINTENANCE PLAN AMENDMENT The 2002 PCPCMP prepared by BAS, Lewis Engineering, and GLA was subsequently updated with PCPCMP Amendment No. 3 (SWT, 2008). As part of the Five-Year Permit Review, the post-closure maintenance cost estimate has been updated and is included as Table 4. The post-closure maintenance cost estimate is also discussed in Section 1.9. The FL will be closed in several stages over the life of the landfill. Upon completion of closure construction activities and certification, partial closure post-closure monitoring and maintenance will begin as part of ongoing active landfill operations. Once the entire FL is closed (after the last staged closure area is completed), the 30-year post-closure maintenance period will begin. It should be noted that post-closure monitoring and maintenance procedures are outlined in the 2002 PCPCMP (BAS). 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 (extraction wells) 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. 4) and the 2002 PCPCMP to accommodate placement of the final cover at the final partial (staged) closure area. Permanent landfill gas migration monitoring probes have been installed to accommodate the revised facility boundary in accordance with 27 CCR. Additional probes may be added, as necessary. Surface and subsurface system monitoring and gas control system adjustments/modifications will be conducted during post-closure maintenance to provide compliance with applicable State and Federal regulations. Settlement Monitoring Permanent survey monuments will be installed during closure of Stage I (A, B and C). An aerial photographic survey will be performed upon completion of each area's (stage) closure construction activities. In accordance with 27 CCR requirements, the operator will update the aerial survey of the landfill once every five years throughout the post closure maintenance period. 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 Forward Landfill SWT Engineering PCPCMP Amendment No.4-May 2013 z:\projects\allied waste\forward\five year permit rvw 2013\itd-5 yr pr 2013\appendices\app a-pcpcmp 2013\pcpcmp amend 2013.doc