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MAXIMUM EXTENT OF LANDFILL REQUIRING CLOSURE <br /> Since the landfill will be developed in modules, the maximum <br /> extent of the landfill that wil require closure at any <br /> given time is estimated to be 0 acres The maximum extent of <br /> closure would occur when one 20 a module has been filled, the <br /> next 20 acre module has begun to accept waste, and a third module <br /> has been partially excavated (10 acres) . In this case, the first <br /> module would need final cover, the second module would need to be <br /> filled to natural ground level and final covered, and the third <br /> module would need to be refilled with soil. <br /> STRUCTURE REMOVAL <br /> Landfill structures (Figure 3) consist of a main gatehouse (about <br /> 100 sq. ft. ) , a maintenance building (3000 sq. feet) , and a <br /> foreman's residence (1500 sq. ft. ) . All concrete foundations, <br /> flooring, and pads will be removed after final closure (estimated <br /> at the year 2062) . It is uncertain, at this time, whether any <br /> of the structures will be salvaged for use elsewhere. <br /> DECOMMISSIONING ENVIRONMENTAL CONTROLS <br /> Any gas wells or probes which may have been installed inside or <br /> adjacent to landfill structures will be filled and sealed with <br /> bentonite upon removal of the structures. The perimeter <br /> monitoring devices, the groundwater monitoring network, and the <br /> leachate collection and removal system will remain intact and <br /> maintained for the 30 year postclosure monitoring period. After <br /> the monitoring period has expired, all monitoring device wells <br /> will be decommissioned to comply with County ordinances and state <br /> regulations. Drainage controls will remain to prevent ponding <br /> and leachate production after closure. <br /> SITE SECURITY <br /> Sixty days prior to the closure of the site, a sign stating the <br /> date of closure and alternative waste disposal site will be <br /> posted at the point of access. The sign will remain at least 180 <br /> days after the last waste shipment. Also, a notice will be <br /> placed in a local newspaper containing the information above. <br /> Within ten days following the last waste shipment, a sign will be <br /> posted at the access point indicating a local or toll free <br /> telephone number for emergency notification and where the <br /> closure/postclosure plans are kept and can be viewed. Also, the <br /> 12 <br />