remediation and risk management of extractable petroleum hydrocarbon contamination … ·...
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Remediation and Risk Management of Extractable Petroleum Hydrocarbon Contamination in Freshwater Sediments
BC PerspectiveRemTech – October 20th, 2011
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2 1-Nov-11
Outline
Site OverviewCollapsed AreaInvestigationRemediationRisk Assessment Risk ManagementConclusions
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Site Overview
3 1-Nov-11
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Site Overview
4 1-Nov-11
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Site Overview
5 1-Nov-11
1938
1963
2010
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Site Overview
6 1-Nov-11
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Collapsed Area
7 1-Nov-11
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Investigation
8 1-Nov-11
Collapsed wharf
View from under the wharfPartially buried metal debris piles
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9 1-Nov-11
So….
Because of the debris, APEC 4 was carried forward as an AEC.
“Let’s remove the metal mounds so there is better habitat in the Fraser River…”
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Remediation
10 1-Nov-11
Intact metal debris pilePile removed Oil released when piles were removed
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11 1-Nov-11
How do we know when we can stop sediment remediation?
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Risk Assessment
12 1-Nov-11
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Risk Assessment
Benchmarks
Habitat
Physical-chemical properties
Toxicity Testing
13 1-Nov-11
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Risk Assessment
14 1-Nov-11
10-day14-day
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Risk Assessment
H.azteca– % survival: no significant effects
Chironomids– % survival and growth: no significant effects
15 1-Nov-11
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Risk Assessment
16 1-Nov-11
½ MDL
Control 1
20% Effects Level
50% Effects Level
Control 2
Toxicity Test Results – Growth of H. azteca
20% Effects Level
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Risk Management
Lines of Evidence– Habitat– Physico-chemical properties– Toxicity testing
Considerations– Erosional and depositional– River flow– Artesian groundwater
Mitigation– Cap design
17 1-Nov-11
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Conclusions
18 1-Nov-11
Before
February, 2010
After
August, 2011
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Acknowledgements
19 1-Nov-11