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2-1 2.0 PRELIMINARY POST-CLOSURE MAINTENANCE PLAN AMENDMENT The 2002 PFel;m;naFy PlaR PCPCMP prepared by BAS, Lewis Engineering, and GLA was subsequently updated with PCPCMP Amendment No. 4-3 of the DGDGn I-Pt Wj , 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. A eepy of the updated post clesure maintenance eest estimate is included as Table 4 and FnatGhes the estimate On--Ai;^rE Amendment Alr-rrvTof the 2002 PGPGMP The FL will be closed in tee-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 Rpost-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. 4-3) and the 2002 PCPCMP to accommodate placement of the final cover duFin4at the final partial (staged) closure-areacage`:1+. Permanent landfill as migration monitoring probes have meady been installed aFE)Und the perimeter of the ref�aotpF4A--to accommodate the revised facility boundaryin accordance with 27 CCR. Additional probes may be added as necessary. Surface; and subsurface and—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 Two-pPermanent survey monuments will be installed during closure of Stage I (A, B and Q. An aerial photographic survey will be wed-performed upon completion of each ^I�fe area's stage) closure construction activities. a In accordance with 27 CCR requirements, the operator will update the aerial survey of the landfill once theFevery five years duFm +g�- hroughout the post closure maintenance period to tragi, settlement. If additional fill contour information is needed, it should be noted that aerial flyovers will be conducted annually throughout active refuse disposal operations. Forward Landfill SWT Engineering PCPCMP Amendment No.4-May 2013 z:\projects\allied waste\forward\five year permit rvw 2013\jtd-5 yr pr 2013\appendices\app a-pcpcmp 2013\text\pcpcmp amend 2013.doc