POWER December 2014 - 51
COAL COMBUSTION RESIDUALS
2. Schedule time for dewatering. Ash pond dewatering can take weeks or months.
Here the task is handled using portable pumps. Courtesy: Barry Culp/TRC
Each option has specific development requirements
and constraints. For example, if
plans include building a structure that is sensitive
to foundation settlement, the closure
approach for the pond should include either
removal of some or all ash materials or its
compaction to the standard of an earthen
structural fill.
In other instances, it's acceptable to
leave partially stabilized ash in place and
bridge compressible materials with geosynthetic
and compacted fill with advance
accommodations made for anticipated
settlement. This option works well for
siting a truck-parking area, where surface
settlement is easily tolerated through
minor grading or addition of fill to level
depressions or " bird baths. " Temporary
structures, such as a lightweight mobile
trailer, can be periodically leveled with
screw jacks.
■ Converting the former pond into a lined
landfill.
■ Developing a wetland treatment system
for leachate or process waters.
■ Reclaiming the area for plant expansion,
parking, or a material laydown yard.
■ Converting a portion of the pond for use in
ongoing or future wastewater management.
■ Constructing a solar panel farm.
■ Converting the site for recreational use.
Remediation Integration
For sites with groundwater impacts, removal
of the pond from service can alter groundwater
flow and gradients. Active monitoring,
and implementation of groundwater treatment
regimens, can be employed to address
affected groundwater.
2014
Enhanced PDF version now available
The 2014 UDI Who's Who Directory covers more than 4,500
U.S. and Canadian generating plants. The directory provides:
* Nearly 8,100 plant management and support
contact names, titles, and primary job functions.
* Basic plant operating statistics for more than 1,500
power stations, including:
Generation (MWh)
Availability (%)
Heat rate
Capacity Factor (%)
* Power plant design characteristics
Choose which purchase option that best suits your needs:
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UDI WHO'S WHO AT ELECTRIC POWER PLANTS
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December 2014 | POWER
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POWER December 2014
Table of Contents for the Digital Edition of POWER December 2014
Contents
POWER December 2014 - Cover1
POWER December 2014 - Cover2
POWER December 2014 - Contents
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