Final Site Information Package for National Remedy Review Board ...
Final Site Information Package for National Remedy Review Board ...
Final Site Information Package for National Remedy Review Board ...
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[Two Updated<br />
Updated Woodland<br />
Ecological<br />
Park Components of Combined Remedial<br />
OU 2 a<br />
Alternatives from Ecological Alternatives Alternatives*<br />
the 2001 FS] 3 and 4 [Five Remedial Alternatives] [10 Action Alternatives]<br />
Alternative 3+:<br />
More Extensive<br />
Removal,<br />
Disposal, and<br />
Treatment<br />
Alternative 4+:<br />
Maximum Removal,<br />
Disposal,<br />
and Treatment<br />
Targeted source<br />
control,<br />
French drains/stream<br />
lining<br />
Alternative (a): Minimal Stream<br />
Lining<br />
+ =<br />
Equivalent to 2001 FS<br />
Ecological Alternative<br />
4, except <strong>for</strong> changes<br />
to the water treatment<br />
TCD<br />
+<br />
Alternative (b): Extensive Stream<br />
Lining<br />
Alternative (c): French Drains b<br />
Alternative (d): Stream<br />
Lining/French Drain Combination b<br />
+ =<br />
Alternative (e): Extensive Stream<br />
Lining/French Drain Combination<br />
Alternative 3+(a)<br />
Alternative 3+(b)<br />
Alternative 3+(c)<br />
Alternative 3+(d)<br />
Alternative 3+(e)<br />
Alternative 4+(a)<br />
Alternative 4+(b)<br />
Alternative 4+(c)<br />
Alternative 4+(d)<br />
Alternative 4+(e)<br />
* The five OU 2 alternatives are combined with each of the two OU 3 alternatives to <strong>for</strong>m 10 action alternatives.<br />
With the addition of the No Action Alternative, a total of 11 remedial alternatives were evaluated in the FFS<br />
Report (USEPA, 2010).<br />
FS = Feasibility Study<br />
OU = Operable Unit<br />
TCD = typical conceptual design<br />
a<br />
All the OU 2 alternatives also include the same set of actions <strong>for</strong> the Reed and Russell Tunnel adit flows: installation of a check dam<br />
to reduce or eliminate the flow of contaminated water, with a contingency plan <strong>for</strong> collection and treatment of discharge water if<br />
needed.<br />
b A limestone permeable reactive barrier (PRB) was evaluated as a potential option in place of a portion of the French drain in these<br />
alternatives (FFS Report [USEPA, 2010], Section 6.3 and Appendix F). However, based on the results of this evaluation, the PRB<br />
option has not been retained <strong>for</strong> direct inclusion in the alternatives. Additional study would be needed to further evaluate the potential<br />
effectiveness and cost of the PRB option.<br />
Figure B8-1<br />
Schematic Illustration of the Remedial Alternatives<br />
<strong>Site</strong> <strong>In<strong>for</strong>mation</strong> <strong>Package</strong> <strong>for</strong><br />
<strong>National</strong> <strong>Remedy</strong> <strong>Review</strong> <strong>Board</strong>