Analysis - The Institute for Southern Studies

Exhibit 4D
Comparison of Annual O&M Costs for Wet and Dry CCR Disposal (Source: 1985 EPA Study; $/dry metric ton)
Plant Size Categories (MW = megawatts)
Row Summary
Wet or Dry 250 500 1000 2000
Across Four Size Categories
Item Disposal Operation CCR Min Max Min Max Min Max Min Max Min Max Midpnt Mean
Fly Ash:
1A Fly ash handling/processing Wet $2.5 $6.8 $1.0 $5.4 $1.6 $4.3 $1.3 $3.6 $1.0 $6.8 $3.9 $3.3
1B Dry $2.5 $4.7 $2.1 $3.9 $1.7 $3.2 $1.5 $2.7 $1.5 $4.7 $3.1 $2.8
2 Fly ash storage Dry $3.3 $6.1 $3.0 $5.6 $2.8 $5.2 $2.5 $4.7 $2.5 $6.1 $4.3 $4.2
3A Fly ash transport Wet $4.2 $7.6 $3.2 $5.9 $2.5 $4.7 $2.0 $3.7 $2.0 $7.6 $4.8 $4.2
3B Dry $1.7 $3.1 $1.5 $2.8 $1.3 $2.5 $1.2 $2.2 $1.2 $3.1 $2.2 $2.0
4A Fly ash placement/disposal Wet $11.5 $21.3 $9.1 $16.8 $7.2 $13.5 $5.7 $10.5 $5.7 $21.3 $13.5 $12.0
4B Dry $7.0 $13.0 $5.6 $10.5 $4.6 $8.5 $3.7 $6.9 $3.7 $13.0 $8.4 $7.5
Subtotal fly ash Wet (1982$) $18.2 $35.7 $13.3 $28.1 $11.3 $22.5 $9.0 $17.8 $8.7 $35.7 $22.2 $19.5
Dry (1982$) $11.2 $20.8 $9.2 $17.2 $7.6 $14.2 $6.4 $11.8 $6.4 $20.8 $13.6 $12.3
Bottom Ash:
5 Bottom ash
Wet/Dry $11.3 $22.8 $9.0 $19.1 $6.9 $15.7 $5.3 $12.8 $5.3 $22.8 $14.1 $12.9
handling/processing
6A Bottom ash transport Wet $9.2 $17.1 $7.3 $13.5 $5.6 $10.3 $4.3 $7.9 $4.3 $17.1 $10.7 $9.4
6B Dry $3.4 $6.3 $2.8 $5.2 $2.2 $4.1 $1.8 $3.3 $1.8 $6.3 $4.1 $3.6
7A Bottom ash
Wet $9.2 $17.1 $7.9 $14.6 $6.5 $12.1 $5.4 $10.0 $5.4 $17.1 $11.3 $10.4
placement/disposal
7B Dry $5.4 $10.0 $4.7 $8.8 $4.1 $7.6 $3.5 $6.5 $3.5 $10.0 $6.8 $6.3
Subtotal bottom ash Wet (1982$) $29.7 $57.0 $24.2 $47.2 $19.0 $38.1 $15.0 $30.7 $15.0 $57.0 $36.0 $32.6
Dry (1982$) $20.1 $39.1 $16.5 $33.1 $13.2 $27.4 $10.6 $22.6 $10.6 $39.1 $24.9 $22.8
Summary (Fly Ash & Bottom Ash):
Weighted average* Wet (1982$) $20.7 $40.4 $15.7 $32.3 $13.0 $25.9 $10.3 $20.6 $10.1 $40.4 $25.2 $22.4
Dry (1982$) $13.2 $24.8 $10.8 $20.7 $8.8 $17.1 $7.3 $14.2 $7.3 $24.8 $16.1 $14.6
2009 updated weighted average** Wet (2009$) $46.4 $90.4 $35.2 $72.3 $29.1 $58.1 $23.1 $46.2 $22.6 $90.4 $56.5 $50.1
Dry (2009$) $29.5 $55.6 $24.2 $46.4 $19.8 $38.3 $16.4 $31.8 $16.4 $55.6 $36.0 $32.7
Incremental cost from conversion to dry disposal = -$17.4
Notes:
* Fly:to:ash weighted average based on 2005 relative annual tonnages evaluated in the RIA: Fly ash tons/year = 15,200,000; Bottom ash tons/year = 4,300,000
** 2009 price update multiplier (source: ENR Construction Cost Index ratio 2009:to:1982 = 8564/3825) = 2.239
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