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foot thick foundation layer (one foot assumed to be in-place) composed of random <br /> soil materials; a one foot thick low-permeability layers with a permeability of 1x10-6 <br /> cm/sec or less; and a two-foot vegetative layer of random soils. Engineered <br /> alternative cover systems may be proposed to address specific engineering <br /> requirements that arise in the course of preparing detailed designs for the individual <br /> closure stages. The cost of constructing the final cover includes site preparation, site <br /> grading, final cover placement and settlement monument installation. <br /> 1.8.2 Final Cover Construction Quality Assurance Monitoring and Testing <br /> Costs for CQA include the final cover placement tests, inspections and reporting. <br /> 1.8.3 Drainage Control System <br /> Costs for the drainage control system include the construction, removal and <br /> replacement of inlet structures and down drains over a 24:7.8187.6-acre area. <br /> Construction of the permanent drainage control system for the current fill area is <br /> complete. As operations expand, the drainage control facilities for the upcoming fill <br /> area are installed concurrent with liner construction as part of normal landfill <br /> development. No costs for drainage construction, other than for final closure items <br /> are included in the closure cost estimate. <br /> 1.8.4 Landscaping and Erosion Control <br /> This category covers the cost of landscaping construction which includes soil <br /> preparation and planting of vegetative materials. <br /> 1.8.5 Gas Control System <br /> This category includes the cost of extension of the wells through the cover and <br /> lateral piping system modification during placement of the final cover system. <br /> 1.8.6 Site Security <br /> This category includes costs for required signage at closure of Stage VI or any <br /> lesser portion of the site. The site is currently enclosed with a perimeter fence and <br /> gates or has topographic constraints to prevent unauthorized access to the site <br /> property. <br /> 1.8.7 Demolition <br /> This category generally includes costs for dismantling and removal of on-site <br /> structures (i.e., fee booths and landfill scales). <br /> 1.8.8 Gas Migration Monitoring System <br /> This category assumes that all gas migration monitoring probes will be placed <br /> 9 <br /> Forward Landfill-PCPCMP Amendment <br /> (Z:\PROJECTS\Allied Waste\JN81013 5 yr Review Plan\PCPCMP Amend 3 July 08\FinalCPRRevl.doc; <br /> Amendment No.3:7/3/20 W-/— 88) <br />