Columbia River Overview Superfund Process Conceptual Site Models Data Gap Analysis
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Transcript of Columbia River Overview Superfund Process Conceptual Site Models Data Gap Analysis
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▀ Columbia River Overview▀ Superfund Process
▀ Conceptual Site Models▀ Data Gap Analysis
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Columbia River Surface Water Hydrology Plays a Critical Role in Sedimentation
▀ Flow rates ▀ High flows within
the Hanford section results in minimum sedimentation
▀ Major river confluences ▀ Yakima▀ Snake ▀ Walla Walla
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The Majority of the Hanford Reach is a Non-Depositional Area
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The Majority of the Hanford Reach is a Non-Depositional Area
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USGS Annual Statistics
Average Flow (cfs)
Suspended Load (Kg/m3)River
0.063,512Yakima
0.01654,830Snake
0.00375117,480Columbia (Priest Rapids Dam)
568
2366
1188
EstimatedSuspended
Sediment Load (tons/day)
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Yakima
Snake
Walla Walla
Columbia
Flow average 117,480 cfs (1188 tons/day)
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Columbia
Yakima
Walla WallaFlow average 54,830 cfs
(2,366 tons/day)
Snake
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Snake
Columbia
Walla Walla
Flow average 13,512 cfs (568 tons/day)
Yakima
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Yakima
Snake
Columbia
Flow average 568 cfs
Walla Walla
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McNary Dam currently has approximately 30ft of sediment
▀ Average Annual Deposit Rate is 2 to 7 in/yr
200019901980197019601950
Est. 30 ftSediment}
90 ftWater
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Conceptual
Exposure Model
Primary Sources
Medium of Concern
Exposure Point
Potential Exposure Route
Potential Receptors
Rural Residents
Native American
Industrial Worker
Monument Worker
Avid Angler
Casual User
Ecological Receptors
Area 100/300
Sediment Near shore and islands
Ingestion
Dermal Contact
Surface water
River water Ingestion
Dermal Contact
What is a CEM? ▀ Sources ▀ Migration pathways ▀ Receptors ▀ Exposures
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Sources of Contaminants to the River
▀ Upriver Sources ▀ Hanford Reach Sources▀ Downriver Sources
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Generic Hanford Conceptual Site Model
Historic coolingwater discharge
GW seepsReactors/OperationalAreas
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Conceptual Site Model – Cross Section
Cross section illustrates:▀ Sources ▀ Migration pathways ▀ Receptors: people, benthic, fish, etc.▀ Potential Exposure Points
Receptors Source
Cooling water
Columbia River
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Site Conceptual Model – Recreational IslandsReceptors Source
Cooling water
Columbia RiverColumbia River
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Conceptual Site Model – Richland Area
Agriculture Beach
Industry HouseIndustrial discharge
Water IntakeStructure
Water supplyWater supplyColumbia River
Irrigation discharge
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Columbia River
West East
CRC Study Area
Study Area Cross-Section
Hanford Site
100/300 Study Areaand Inter-Area
Green line