ARCHIVED REPORTS_2002_1 - Laserfiche WebLink

Home Browse Search

1.6 Site Security The FL is secured with perimeter fencing and locking gates. The FL is not open to the public so access to the staged closure areas will be limited to site personnel. The only foot, vehicle and/or equipment that will be allowed within the staged (partial) closure areas will be for post-closure monitoring and maintenance. 1.7 Post Closure End Use The post closure end use for the FL, which includes all staged closure areas, is non- irrigated open space. As the staged closure areas are completed, native vegetation will be planted which will provide erosion control. 1.8 Closure Cost Estimate In order to establish the basis for the proper level of funding for a landfill to be closed in increments over its active life, a closure sequence or staging plan must be prepared. Then, in order to meet 27 CCR requirements, the cost estimate must be based on the maximum extent or area of the landfill that would ever require closure. Since the FL is proposed to be closed in six stages, the basis of the closure cost estimate is the largest area requiring closure over the life of the landfill which, based on Table 1, is 217:8-187.6 acres. The active fill area will be maintained to an area equal to or less than this coverage area. As shown on Table 1, the maximum closure area will decrease over time. Therefore, the closure cost estimate can be reduced once Stage I is completed and again after Stage VII is completed. The cost estimate presented in Table 3 is a new closure cost estimate for this PCPCMP Amendment-R and serves as the basis to fund the closure account over the life of the landfill. The closure cost estimate reflects third-party costs in 20032008 dollars. The closure features are grouped into categories for convenience in presenting the cost estimate. A brief description of the components included in each category is given below. 1.8.1 Final Cover Based on the proposed final grading contours, the approximate area which will require placement of final cover is 217.8-187.6 acres. The proposed final cover for the FL will consist of two different covers, one each for the lined and unlined portions of the landfill. For the lined portions of the landfill the final cover will consist of a minimum two-foot thick foundation layer (one foot assumed to be in-place) composed of random soil materials; a barrier layer consisting of a synthetic cover (i.e., a 40-mil V€PELLDPE geomembrane) overlain by with high density polyethylene (HDPE) geosynthetic drainage strips; and a two-foot vegetative layer of random soils. For the unlined portions of the landfill the final cover will consist of a minimum two- 8 Forward Landfill-PCPCMP Amendment (Z:\PROJECTS\Allied Waste\1N81013 5 yr Review Plan\PCPCMP Amend 3 July 08\FinalCPRRevl.doc; Amendment No.3:7 3 20)Eq41/_"GG8)