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the metals pose an unacceptable risk to insects and small birds and animals. Based on the results of the risk assessment, EPA determined that the response action for the three units was necessary to:
In accordance with the National Contingency Plan, EPA designated this response action to be a Non-Time Critical Removal Action.
Components of the Proposed Plan
EPA has proposed several cleanup alternatives for
each unit. EPAs preferred response action for each of the three units will meet the
objectives of: 1) protecting public health and the environment; 2) complying with
identified Applicable or Relevant and Appropriate Requirements (ARARs), particularly
Virginias solid-waste management closure regulations; and 3) ensuring consistency
with the conceptual site reuse plan.
Alternative SB 1: Eliminate SB 5 and Install Simple Soil Cover on SB 1-4E. This alternative consists of eliminating SB5, installing a two-foot-thick-soil cover on SBs 1-4E, post-closure maintenance, groundwater monitoring, and using institutional controls to prevent disturbance of the soil cover. The sludge would be
The three units addressed in the Proposed Plan are the sulfate Basins, Wastewater Treatment Plant Basins, and Fly, Ash Basins and Stockpile.
removed from SB 5 and placed in SBs l-4E, any contaminated soil would also be removed, the excavated area would be regraded and vegetated and the area returned to the pre-development condition.
Alternative SB 2: Eliminate SB 5 and Install Enhanced Soil Cover on SB 1.4E. This alternative consists of eliminating SB 5, installing an "enhanced" soil cover on SBs 1-4E, post-closure maintenance, groundwater monitoring and using institutional controls to prevent disturbance of the soil cover.
EPAS recommended alternative for the response action for the Sulfate Basins is the Alternative SB 2.
Alternative WIT/B 1: Cover with Soil In-place. This alternative consists of regrading and installing a soil cover over the basins in their current configuration, post-closure maintenance, groundwater monitoring, and using institutional controls to prevent disturbance of the soil coves
Alternative WWB 2: Consolidate Sludge in PolishingBasin 1 and Cover with Soil. This alternative consists of consolidating the sludge into one of the WWBs (polishing basin), installing a soil cover, post.. dosure cover maintenance, ground-water monitoring, and using institu-