River Corridor Closure Project

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River CorridorClosure Project
Safety People Results
End State and Final Closure
Jill E. Thomson Manager, Risk Assessment
June 1 and 2, 2006
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Risk Assessment Scope
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River Corridor Source Areas Risk Assessment Scope
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100 Area and 300 Area Component of the RCBRA

• The risk assessment is needed to characterize
  risk and to complete the CERCLA process
• Typically part of the RI/FS process
• Incorporates the work done for the 100-B/C Pilot,
  and 100-NR-2 shoreline evaluation to present a
  complete human and ecological risk assessment for
  the river corridor source areas

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100 Area and 300 Area Component of the RCBRA

• Quantitatively evaluates ecological and human
  health risk
• Scheduled for completion early Fall 2007
• Large and complex ecological and human health
  risk assessment

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Inter-Areas Shoreline Assessment

• Risk Assessment approach to evaluate risk in
  areas in-between reactor/industrial areas
• Will apply approach used for the 100 and 300 Area
  risk assessment
• Riparian and Near-shore area counterpart to the
  Inter-Areas Upland evaluation, which will follow
  the Orphan Sites approach
• Sampling will begin in early Fall 2006, with the
  risk assessment scheduled for completion early
  Fall 2007

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Columbia River Component

• Includes presenting data evaluation and scoping
  report
• Discussion to follow

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Remedial Investigation Report

• Typically (along with a feasibility study)
  evaluates the alternatives for remediation
• For the RCC remedies are identified in the
  current RODs
• The WCH RI will present risk assessment results
  to support final ROD decisions
• Scheduled to occur Oct. 2007 Oct. 2008

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Source Areas Proposed Plan

• Identifies the preferred remedy and
• Summarizes the information contained in the RI
  report
• Presents rationale for the selection of the
  remedy
• Solicits formal public review and comment
• Scheduled for Feb. 2008 - March 2009

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Surface Soil Surveys

• Surveys will be conducted following completion of
  remediation in the reactor/industrial areas
• One survey each will be performed for the 100,
  300, 400 and 600 Areas
• The process to establish the approach will begin
  in early Fall 2006