NC0003433_Table 6-6 Remediate Alternative Feasibility Summary Cape Fear_20160229

TABLE 6-6
REMEDIAL ALTERNATIVE EVALUATION SUMMARY
CAPE FEAR STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, MONCURE, NC
Alternatives
Effectiveness
Implementability/
Environmental
Estimated
Groundwater
Community
Feasibility
Sustainability
Remediation Cost
Acceptance
Monitored Natural
Yes, groundwater
High
Sound technical
Attenuation (MNA)
Yes
monitoring wells are
(lowest carbon
$3.6M
basis for
common
footprint)
approach
Yes (assuming
Moderate
Positive due to
Groundwater
adequate space
(energy
active nature,
Extraction
Yes
between dike along
consumption of
$7.OM
additional
(Interceptor Trench)
the southwest portion
collection and
permitting
of the 1985 ash basin
treatment
required
and railroad ROW)
system)
Moderate to
$9.9M, assuming
High (Passive
zero valent iron
Yes, but two
Yes (assuming
system and
treats boron and
Positive due to
In -Situ Chemical
different reactive
adequate space
reactive
other constituents.
active nature,
Permeable Reactive
media may be
between dike along
material
However, a second
additional
Barrier
required to treat
the southwest portion
potentially has
reactive media (not
permitting
boron and other
of the 1985 ash basin
a decade(s)
included in this
required
constituents
and railroad ROW)
long
cost) may be
effectiveness
required to treat
duration
boron.
Prepared By: RKD Checked By: CJS
Assumptions: 1. Source control measures are implemented to accomplish groundwater restoration
2. Costs for groundwater remedy include implementation and 30 years monitoring and maintenance
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