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4.3 DRAINAGE SYSTEM MAINTENANCE <br /> Post-closure maintenance personnel at the landfill will inspect and maintain the <br /> drainage system at Stage IA on a quarterly basis and after significant storm events. <br /> The effectiveness of the surface drainage control structures will be maintained by <br /> keeping drainage ditches clear of debris and excessive vegetation and by making <br /> repairs, as necessary, to correct the effects of physical damage, erosion, settlement, <br /> or other events detrimental to operation of the drainage control system. <br /> Corrective measures will be implemented if inspections reveal excessive erosion or <br /> damage to the drainage channels, or if settlement causes ponding of stormwater <br /> on the final cover. Eroded areas will require removal of the affected loose <br /> material, followed by replacement and regrading of the area to match the adjacent <br /> surface contours. If ponding is observed in a channel over the final cover, the <br /> channel will be regraded to permit proper drainage of runoff. Inspections and <br /> maintenance of the drainage system will be carried out quarterly and after large <br /> precipitation events. <br /> 4.4 VEGETATIVE COVER MAINTENANCE <br /> Personnel at the landfill will maintain and inspect the vegetative cover at the Stage <br /> IA area on a quarterly basis and after significant storm events. Vegetative cover <br /> destroyed by erosion will be reseeded following regrading. If degradation of the <br /> vegetative cover is observed in any area, that area will be investigated to <br /> determine the cause of the degradation. Investigation procedures may include soil <br /> gas analyses to determine methane content in the root zone. If degradation is <br /> suspected to be caused by landfill gas-induced asphyxiation, a gas wells may be <br /> installed to reduce gas flux into the root zone in the area of the observed <br /> degradation. Measures will be taken as practicable to correct any other condition <br /> found to be causing vegetative degradation. Inspections and fertilization of the <br /> vegetative cover will be carried out on an annual basis. <br /> 4.5 FRENCH DRAIN LIQUID SEEP COLLECTOR MAINTENANCE <br /> Since the french drains are a buried system, the main maintenance procedure will <br /> be final cover maintenance as discussed in Section 4.2. In addition, the leachate <br /> holding tanks will be emptied periodically with portable pumps and trucked to the <br /> leachate impoundment pond. <br /> Forward Landfill PFCPCMP 4-2 <br /> J:\Allied\Forward\2005.0051 Partial Closure\Partial Closure Plan\FL-sec4.doc:6/9/2005 <br />