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. 5:9_ CLOSURE/POST-CLOSURE MAINTENANCE COST ESTIMATE <br />5.1 INTRODUCTION <br />In order to establish the basis for the proper level of funding to close and <br />provide post -closure maintenance for the Forward Landfill in an environmentally <br />sound manner, a cost estimate has been prepared reflecting the proposed <br />closure design and post -closure maintenance procedures presented in Sections 3 <br />and 4 of this PCPCMP. The estimate for closure improvements was combined <br />with an estimate for constrmctfoii management�gaality assurance services -to <br />determine the total closure cost. <br />5.2 CLOSURE COST ESTIMATE <br />The Plan features are group`ed'into-categories°for convenience in presenting -the <br />cost estimate. A brief description of the components included in each category <br />is given below. The total closure cost estimate is shown on Table 8. <br />G 5.2.1 FINAL COVER <br />• <br />Based on the proposed final grading plan, the approximate area which will <br />require placement of final cover is 347 acres. The proposed final cover for the <br />Forward Landfill will consist of a minimum two -foot thick foundation -layer of <br />approved soil, contaminated soil, incinerator ash, or other waste materials placed <br />immediately over the entire surface of the last lift of refuse; a VFPE <br />geomembrane which is equal to the least permeable portion of the liner system; <br />HDPE geosynthetic drainage strips and a two -foot erosion control (vegetative) <br />layer. <br />5.2.2 FINAL COVER CONSTRUCTION QUALITY ASSURANCE MONITORING AND <br />TESTING <br />Costs for construction quality assurance include the final cover placement tests, <br />inspections and reporting. <br />Forward Landfill PCPCMP 5-1 <br />L:\Allied\2000.193\Reports\FinaIPCPCMP:FL-sec5: 8/22/01 BRYAN A. STIRRAT 6 ASSOCIATES <br />