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GeoSyntec Consultants <br />4.5.1 Final Cover Maintenance <br />The integrity of the final cover will be maintained by repairing the effects of <br />settlement, subsidence, erosion, or damage to the vegetative layer. Areas that show <br />evidence of damage will be investigated to ascertain the cause of the damage before <br />repairs are undertaken. If the damaged areas have caused ponding of surface runoff, <br />soil will be added as needed and regraded until positive draining slopes are <br />re-established. If the repaired area is large enough, it will be remulched and <br />revegetated. Inspections of the final cover will be performed on a quarterly basis. <br />Vegetative cover destroyed by erosion will be remulched and reseeded following <br />any regrading. If degradation of the vegetative cover is observed in any area, that area <br />will be investigated to determine the cause of the degradation. Measures will be taken, <br />as practicable, to correct any condition found to be causing vegetative degradation. The <br />vegetative growth will be watered through natural rainfall. <br />4.5.2 Drainage System Maintenance <br />The surface drainage control structures will be maintained by keeping drainage <br />ditches clear of debris and excessive vegetation and by making repairs, as necessary, to <br />correct the effects of physical damage, erosion, settlement, or other events detrimental <br />to operation of the drainage control system. Corrective measures will be implemented <br />if inspections reveal excessive erosion or damage to the drainage channels, or if <br />settlement causes ponding of runoff on the final cover. Eroded areas will require <br />removal of the affected loose material, followed by replacement and regrading of the <br />area to match the adjacent surface contours. If ponding is observed in a channel over <br />the 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 and <br />after large precipitation events. <br />4.5.3 Leachate Control System Maintenance <br />The leachate riser pipes for WMUs D-87, D -88-S, and D -88-N are located within <br />the closure area for WMU B. The pipes will be inspected, maintained, and repaired as <br />necessary during the post -closure period. The maintenance program will include <br />quarterly inspections of the leachate collection pumps and leachate evaporation ponds <br />and annual inspections of the riser pipes. The riser pipes will be cleaned, if necessary. <br />J:\ALLIED\FORWARD\CLOSUREPLAN\REPORT 4-3 99.11.30 <br />10 <br />