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4-1 4.0 POST-CLOSURE MAINTENANCE PLAN 4.1 Introduction Post-closure maintenance of the FL Stage 113 Partial Final Closure area will be performed in accordance with applicable regulatory standards included in 27 CCR, Chapters 3 and 4, and 40 CFR Section 258.61. Maintenance activities for the Stage 113 Partial Final Closure Area of the FL will consist of: ♦ Final Cover Maintenance ♦ Drainage System Maintenance ♦ Vegetative Cover Maintenance ♦ Bench Maintenance ♦ Landfill Settlement Monitoring and Monument Maintenance The 30-year post-closure maintenance period for this area will not commence until the final closure project for the entire site is completed. Therefore, the time period between final closure of Stage 1B and the entire site does not count toward the 30-year (minimum) post-closure monitoring and maintenance period for Stage 1B in accordance with 27 CCR, Section 21180(a). For additional details regarding post-closure maintenance procedures, also refer to the FL Preliminary Closure and Post-Closure Maintenance Plan (PCPCMP) (SWT, dated 2008). ® The maintenance procedures for each of these activities are described in the following sections. Please note that landfill gas monitoring and control system maintenance, groundwater monitoring, and site security for those facilities in the Stage 1B partial closure area will be performed/maintained as part of ongoing landfill operations. 4.2 Final Cover Maintenance The integrity and effectiveness of the final cover will be maintained by making repairs, if necessary, to correct the effects of settlement, subsidence, erosion, or damage to the vegetation. Areas that show evidence of damage will be investigated to ascertain the cause of the damage before repairs are undertaken. If the damaged areas have caused ponding of surface runoff, soil will be added as needed and regraded until positive drainage is re-established. Additional final cover will be placed in accordance with the CQA Plan included as Appendix C of this document. If the repaired area is large enough, it will be revegetated. Inspections of the final cover will be performed on a quarterly basis. 4.3 Drainage System Maintenance Post-closure maintenance personnel at the landfill will inspect and maintain the drainage system within the Stage 1B Partial Final Closure on a quarterly basis and after significant storm events. The effectiveness of the surface drainage control structures will be maintained by keeping drainage channels/downdrains clear of debris and excessive vegetation and by making repairs, as necessary, to correct the effects of physical damage, erosion, settlement, or other events detrimental to operation of the drainage control system. Forward Landfill Stage 113 Partial Final Closure/Post-Closure Maintenance Plan June 2011 SWT Engineering z:\projects\allied waste\forward\11-1014 partial fnl clsr pin\partial final closure plan document\text\sec 4.doc