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Columbia River Overview Superfund Process Conceptual Site Models Data Gap Analysis

Columbia River Overview Superfund Process Conceptual Site Models Data Gap Analysis. 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

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Columbia River Overview Superfund Process Conceptual Site Models Data Gap Analysis

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  1. Columbia River Overview • Superfund Process • Conceptual Site Models • Data Gap Analysis

  2. 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

  3. S S S S S S S S S S S The Majority of the Hanford Reach is a Non-Depositional Area

  4. S S S S S S S S S S S The Majority of the Hanford Reach is a Non-Depositional Area

  5. 1188 2366 568 USGS Annual Statistics Estimated Suspended Sediment Load (tons/day) Average Flow (cfs) Suspended Load (Kg/m3) River Columbia (Priest Rapids Dam) 117,480 0.00375 Snake 54,830 0.016 Yakima 3,512 0.06

  6. Columbia Snake Flow average 117,480 cfs (1188 tons/day) Yakima Walla Walla

  7. Columbia Snake Yakima Flow average 54,830 cfs (2,366 tons/day) Walla Walla

  8. Columbia Snake Yakima Walla Walla Flow average 13,512 cfs (568 tons/day)

  9. Columbia Snake Yakima Walla Walla Flow average 568 cfs

  10. 90 ft Water McNary Dam currently has approximately 30ft of sediment • Average Annual Deposit Rate is 2 to 7 in/yr } 2000 Est. 30 ft Sediment 1990 1980 1970 1960 1950

  11. Conceptual Exposure Model What is a CEM? • Sources • Migration pathways • Receptors • Exposures

  12. Sources of Contaminants to the River • Upriver Sources • Hanford Reach Sources • Downriver Sources

  13. Generic Hanford Conceptual Site Model Historic cooling water discharge Reactors/ Operational Areas GW seeps

  14. Conceptual Site Model – Cross Section Receptors Source Cooling water Cross section illustrates: • Sources • Migration pathways • Receptors: people, benthic, fish, etc. • Potential Exposure Points Columbia River

  15. Site Conceptual Model – Recreational Islands Source Receptors Cooling water Columbia River Columbia River

  16. Conceptual Site Model – Richland Area Industrial discharge Water Intake Structure Industry House Irrigation discharge Agriculture Beach Columbia River Water supply Water supply

  17. Green line Hanford Site 100/300 Study Area and Inter-Area CRC Study Area Study Area Cross-Section West East Columbia River

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