1 - paducah environmental information center
1 - paducah environmental information center
1 - paducah environmental information center
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Annual Site Environmental Report for 1999<br />
actions are intended to be focused in nature,<br />
cleanup standards selected under a specific OU<br />
should also be protective of other exposure<br />
scenarios when applicable. For example, if a<br />
groundwater COC is present within the upper 10'<br />
of soil, then the cleanup standard should not only<br />
be protective of the off-site groundwater user<br />
(off-site resident), but it should also reflect<br />
protection of an industrial worker from direct<br />
contact. In cases where the Surface Soils OU is<br />
targeting a COC to .protect industrial workers<br />
from direct contact, the selected Cleanup<br />
standard should also be designed to be<br />
protective of recreational users and ecosystems<br />
should off-site migration via surface runoff be .a<br />
concern.<br />
When a specific SWMU/w AG has the<br />
potential to impact multiple pathways/receptors,<br />
it may be assigned to two or more OUs. As an<br />
example, the COCs contributing to groundwater<br />
may be addressed under the Groundwater OU,<br />
whereas the surficial contamination presenting a<br />
direct contact risk to industrial workers may be<br />
addressed under the Surface Soils OU.<br />
Upon completion of investigation for the<br />
five OUs, a study will be conducted. The scope<br />
of the Comprehensive Site-Wide OU study will<br />
include a comprehensive site-wide baseline risk<br />
assessment to evaluate any residual risk<br />
remaining at the site after completion of<br />
activities at the five initial OUs, and to evaluate<br />
the cumulative effects from all media. If the<br />
Comprehensive Site-Wide OU risk assessment<br />
concludes the actions taken to date collectively<br />
provide adequate protection to· human health<br />
and the environment, a final Comprehensive<br />
Site-Wide OU Proposed Plan and ROD will be<br />
issued. These reports will be followed by a fmal<br />
remediation report declaring site remediation<br />
complete. In the event the Comprehensive Site<br />
Wide OU risk assessment determines additional<br />
actions are needed, a feasibility study (FS) will<br />
be developed with the preferred . alternative<br />
documented in a Proposed Plan and ROD,<br />
folloWed by the necessary remedial actions prior<br />
to issufugthe final remediation report. .<br />
........<br />
Remedial Priorities<br />
PGDP currently contains numerous sites<br />
that are subject to the CERCLA cleanup process.<br />
The SMP establishes work priorities based on<br />
factors specified in the FFA. Under the original<br />
strategy, the WAGs were prioritized based on the<br />
following criteria:<br />
• immediate risks,<br />
• hot spots associated with off-site<br />
contamination,<br />
• suspected sources of off-site<br />
contamination,<br />
• suspected sources of on-site<br />
contamination, and<br />
• groundwater and sUrface water.<br />
While several a
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