lower duwamish waterway superfund site proposed plan feb ... · plan, figure 14 pg. 63 62% 20% 6%...
TRANSCRIPT
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Lower Duwamish
Waterway Superfund Site
Proposed PlanApril 15, 2013
ESC, LLC
Dr. Peter deFur
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Four Cleanup Objectives
Protect people from contaminated fish
Protect people from contaminated sediment
Protect wildlife from contamination
Protect bottom dwelling animals
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http://bioweb.uwlax.edu/bio203/s2009/lu
chterh_wesl/dungcrab.jpg
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Protect Wildlife from Contaminants
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Protect animals that live on the bottom
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Proposed Plan pg. 49
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Dredging: removal
Enhanced recovery: additives
Capping: cover
Natural recovery: Let It Be
Institutional Controls – no fishing
Few options to clean up the river...
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The Preferred Alternative (5C Plus) will address approx. 412 acres
Not including 29 acres of cleanup in Early Action Areas (EAAS)
?Institutional Controls – such as fish advisories?
Preferred Alternative Remediation Elements
84
24
48256
Dredging
Capping
Enhanced NaturalRecovery
Monitored NaturalRecovery
For more
comparison of
alternatives see
Proposed
Plan, Figure 14
pg. 63
62%
20%
6%
12%
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Permanence
Certa
inty
Dredge
Cap
Enhanced natural recovery
Monitored natural recovery
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1E-08
1E-07
1E-06
1E-05
1E-04
1E-03
1E-02
1 meal every other month
1 meal per month
1 meal per week
3 meals per week*
Excess C
an
cer
Ris
ks f
or
PC
Bs
Risks at LDW baseline concentrations
The shaded area indicates EPA's acceptable excess
cancer risk range under CERCLA. The dotted line
indicates the MTCA threshold for individual carcinogens.
1 in 100
1 in
100,000,00
0
1 in
1,000,00
0
1 in
10,000
Excess Cancer Risks for PCBs for Tribal Child
Source: EPA, Hiltner, April 5, 2013
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0
2
4
6
8
10
12
14
1 meal every other month
1 meal per month
1 meal per week
3 meals per week*
No
n-C
an
cer
HQ
s f
or
PC
Bs HQ at LDW baseline concentrations
HQ at model-predicted steady-state concentration
The dotted line indicates the CERCLA
and MTCA non-cancer threshold.
8127
Non-cancer hazard quotients for PCBs for Tribal child
Source: EPA, Hiltner, April 5, 2013
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Source Control from many places
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Proposed Plan pg. 4
Figure 1
Lower Duwamish Waterway and Early Action Areas
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Sources from the Green River
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Map of relevant locations on the Green River upstream of the Lower Duwamish Waterway Superfund Site in Seattle, WA
Quality Assurance Project Plan (QAPP) pg. 11
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Questions?????
At the end