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events. The effectiveness of the surface drainage control structures will be <br /> maintained by keeping drainage ditches clear of debris and excessive vegetation <br /> and by making repairs, as necessary, to correct the effects of physical damage, <br /> erosion, settlement, or other events detrimental to operation of the drainage <br /> control system. Corrective measures will be implemented if inspections reveal <br /> excessive erosion or damage to the drainage channels, or if settlement causes <br /> ponding of stormwater on the final cover. Eroded areas will require removal of the <br /> affected loose material, followed by replacement and regrading of the area to <br /> match the adjacent surface contours. If ponding is observed in a channel over the <br /> final cover, the channel will be regraded to permit proper drainage of runoff. <br /> Inspections and maintenance of the drainage system will be carried out quarterly <br /> and after large precipitation events. <br /> 4.4 VEGETATIVE COVER MAINTENANCE <br /> Personnel at the landfill will maintain and inspect the vegetative cover on the <br /> landfill 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 LEACHATE CONTROL SYSTEM MAINTENANCE <br /> The integrity and effectiveness of the leachate collection system and treatment <br /> system will be maintained by repair or replacement of portions of the system as <br /> necessary. The collection system will be inspected to ascertain that collected <br /> leachate is conveyed from the collection trenches to the leachate evaporation <br /> ponds. A routine monitoring inspection and maintenance program will be <br /> developed for the leachate collection and treatment system during preparation of <br /> plans and specifications. The maintenance program will include quarterly <br /> inspections of the leachate collection pumps and evaporation ponds and annual <br /> inspections of the LCRS pipes. The LCRS pipes will be cleaned, if necessary. <br /> Forward Landfill PCPCMP 4-2 <br /> L:\Allied\2000.193\Reports\FinaiPCPCMP:FL-sec4.doc:5/21/02 BRYAN A.STIRRAT s ASSOCIATES <br />