Analysis - The Institute for Southern Studies

per year. 49 The $64,000 unitized cost for groundwater monitoring generated by the above assumptions applied in the engineering control
cost model used for this RIA is 2.3 times larger and more appropriate to this RIA because it reflects a larger number of wells per-plant to
monitor the groundwater under the larger sized CCR disposal units compared to the average sizes of other types of industrial waste disposal
units.
2. Baseline bottom liners
• Same bottom liner requirements for both new landfills and new impoundments
• The cost estimates include a composite (2-foot compacted clay-synthetic) liner for the more stringent design and a 2-foot compacted clay
liner, single-synthetic liner, and a 2-foot compacted ash liner for less stringent baseline designs.
3. Baseline leachate collection system
• No leachate collection is assumed from beneath the impoundment liner
• The cost estimate is comprised of perforated pipes spaced approximately 300 feet apart along the base of the unit. It includes a wet well for
leachate collection. Leachate is shipped by truck for off-site treatment.
• Assumes 3-inches of leachate per year collected in landfill leachate collection systems.
4. Baseline dust controls
Cost estimate includes CCR compaction equipment, water trucks for spraying CCR during compaction and for spraying unpaved landfill roads,
and covers for landfill trucks:
• Compaction Equipment
Ash is assumed to be compacted in the waste management area by self-propelled rollers for regulatory scenarios including dust controls. A
model cost assumption is that four passes are made by the roller in 6-inch lifts. With these assumptions, the roller can compact
approximately 1,300 cy of ash per day. The operating life of purchased compaction equipment is assumed to be five years. The number of
sheepsfoot rollers required is estimated as follows:
Rollers = (tons/yr)(2,000 lb/ton)(16.02 kg/m3 / lb/cf)
(1,190 kg/m3)(27 cf/cy)(1,300 cy/day)(300 days/yr)
The cost of a sheepsfoot roller is assumed to be $75,000 in 1995 dollars.
Plants will incur annual costs for equipment operation ($0.63/cy) and maintenance.
Maintenance costs are assumed to be 5% of capital costs. Annual costs for compaction are estimated as follows:
Annual Cost = (tons/yr)(2,000 lb/ton)(16.02 kg/m3 / lb/cf)($0.63/cy) + $75,000*0.05*Rollers
(1,190 kg/m3)(27 cf/cy)
Water Truck for Compaction:
Ash is assumed to be wetted in the waste management area by water trucks to facilitate compaction and to control dust. A model assumption is
that FFC plants currently use water trucks 50% of the operational day to control dust on roads (see Water Spray on Roads). It is reasonable to
49 $28,130 per year per-facility average cost derived for purpose of this RIA by dividing the reported $27.818 million annual cost by the reported 989 TSDFs from the EPA
ICR 0959.13, Federal Register, Vol.73, No.103, page 30617; 28 May 2008; http://edocket.access.gpo.gov/2008/pdf/E8-11888.pdf
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