Analysis - The Institute for Southern Studies

Exhibit 5A-14
Estimated Number of Electric Utility Plants by CCR Disposal Unit Type
UL A
LF
CL A
LF
UL C
LF
CL C
LF
UL A
SI
CL A
SI
UL C
SI
CL C
SI
50 21 26 7 31 28 68 31
Multiplying the number of facilities in each category from Exhibit 5A-14 above by the percent of facilities requiring remediation in Exhibit
5A-13 above yields the estimated number of facilities that would lead to state or federal clean ups in Exhibit 5A-15 below. These estimates of
the number of facilities requiring cleanup does not account for any cleanups resulting from other constituents exceeding a hazard quotient of 1.
Thus, this estimate may under-estimate the total number of cleanups.
Exhibit 5A-15
Number of Electric Utility Plants Requiring Future Groundwater Remediation
Clean Up Level
UL A
LF
CL A
LF
UL C
LF
CL C
LF
UL A
SI
CL A
SI
UL C
SI
CL C
SI
Assuming All Groundwater Is Remediated
1.00E-04 11 4 7 1 17 11 47 18
1.00E-05 23 9 15 3 26 21 60 24
1.00E-06 32 14 21 5 30 26 66 29
Assuming Only Potable Groundwater Is Remediated
1.00E-04 4 1 2 0 6 4 16 6
1.00E-05 7 3 5 1 9 7 20 8
1.00E-06 11 5 7 2 10 9 22 9
With the number of units requiring remediation, EPA estimated the cost of groundwater remediation under the baseline and each regulatory
option presented above. Groundwater remediation costs were estimated in two steps. First, EPA assumed contamination that might occur at
sites in states with more stringent monitoring requirements, would be discovered promptly. This suggests that there is likely to be less
remediation required than at the typical site. Thus, EPA assigned these sites the 25 th percentile remediation costs displayed in Exhibit 5A-16
below as the midpoint of the bottom half of costs. These future remediation events were spread evenly across all 75 years of the analysis.
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