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III. PRELIMINARY CLOSURE COST ESTIMATES U� Closure costs are calculated for the closure situatior closure costs will be the most expensive. The maximun p the landfill that will ever require closure at any gi` estimated to be0 Since the landfill will be modules, the mos acr ensive closure time would occur 1 c � r acre module has been filled, the next 20 acre module I accept waste, and a third module has been partially e: acres) . In this case, the first module would need fij the second module would need to be filled to natural grounc revej- and final covered, and the third module would need to be refilled with soil. Other items of closure cost such as fencing, revegetation, etc. are also included as closure costs. FINAL COVER Final cover at the Foothill Sanitary Landfill will be applied as each module reaches capacity. It will consist of 2 feet of foundation layer cover (sandy to silty material) , a 1 foot low- permeability barrier layer (silty material mixed with imported clay) , and a 1 foot vegetative layer (sandy to silty material) . As shown in Table 2, 4,266, 000 cubic yards of soil are needed for the 4 foot thick final cover. The cost for applying final cover over the largest module, 20 acres, and one subsequent module assumed to be 20 acres, will be calculated. That cost, would be the most expensive closure case for placing final cover. Soil Requirements for Final Cover Entire Site Largest Module + 1- 20 Acre Module Foundation layer = 2, 133 ,000 c.y. 129, 067 c.y. Clay cover = 1, 066,500 c.y. 64, 533 c.y. Vegetative cover = 1, 066, 500 c.y. 64 , 533 c.y. Totals 4, 266, 000 c.y. 258, 133 c.y. * Unit Costs for Placement Foundation and Vegetative layer cover. Assuming excavation and placement at 138 c.y. /hr. , and using labor costs at $23 .58 plus scraper operation cost of $60. 10, the following unit cost calculation applies: Unit cost ($23 . 58 + $60. 10) /120 c.y. /hr. _ $0. 70/c.y. 19