ARCHIVED REPORTS_1995 - Laserfiche WebLink

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Foothill Sanitary Landfill Preliminary Closure Plan Revision #1 May 6, 1994 MAXIMUM EXTENT OF LANDFILL REQUIRING CLOSURE The remainder of the landfill will be developed in approximately 20 acre modules and the modules will be closed as the landfill develops. Therefore, the maximum extent of the landfill that will ever require closure at any given time is estimated to be when the existing 80 acres has been filled, the next module (20 acres) has begun to accept waste, and another module has been partially excavated (10 acres) for soil. In this case, the existing 80 acres and first lined module would need final cover and the partially excavated module would have to be refilled with soil. STRUCTURE REMOVAL Landfill structures (Figure 3) consist of a main gatehouse (about 100 sq. ft. ) , a maintenance building (3000 sq. feet) , and a foreman's residence (1500 sq. ft. ) . All concrete foundations, flooring, and pads will be removed after final closure (estimated at the year 2062) . It is uncertain, at this time, whether any of the structures will be salvaged for use elsewhere. DECOMMISSIONING ENVIRONMENTAL CONTROLS Any gas wells or probes which may have been installed inside or adjacent to landfill structures will be filled and sealed with bentonite upon removal of the structures. The perimeter monitoring devices, the groundwater monitoring network, and the leachate collection and removal system will remain intact and maintained for the 30 year postclosure monitoring period. After the monitoring period has expired, all monitoring device wells will be decommissioned to comply with County ordinances and state regulations. Drainage controls will remain to prevent ponding and leachate production after closure. SITE SECURITY Sixty days prior to the closure of the site, a sign stating the date of closure and alternative waste disposal site will be posted at the point of access. The sign will remain at least 180 days after the last waste shipment. Also, a notice will be placed in a local newspaper containing the information above. Within ten days following the last waste shipment, a sign will be posted at the access point indicating a local or toll free telephone number for emergency notification and where the closure/postclosure plans are kept and can be viewed. Also, the entrance will be secured with a gate allowing access to authorized personnel only., The entire perimeter of the property will be fenced to protect the monitoring devices. 12