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Remediation Management of Complex Sites

About this Website
Executive Summary
1 Introduction
1 Introduction Overview
1.1 What is a Complex Site?
1.2 Significance of Complex Sites
1.3 Site Objectives and Interim Objectives
1.4 Remediation and a Reasonable Remediation Time Frame
1.5 What is Adaptive Site Management?
1.6 Notable Previous Guidance for Complex Sites
2 Site Challenges
2 Site Challenges Overview
2.1 Technical Challenges
2.2 Nontechnical Challenges
2.3 Developing a CSM Based on Site Characteristics
3 Remediation Potential Assessment
3 Remediation Potential Assessment Overview
3.1 Whole Site versus Site Segment Analysis
3.2 Preremedy Implementation
3.3 Answering Preremedy Questions
3.4 Weighing the Evidence
3.5 Postremedy Implementation
4 Adaptive Site Management
4 Adaptive Site Management Overview
4.1 Steps in the Adaptive Site Management Process
4.2 Refine the Conceptual Site Model
4.3 Set or Revisit Site Objectives
4.4 Develop Interim Objectives and an Adaptive Remedial Strategy
4.5 Document Interim Objectives and the Remedial Approach
5 Long-Term Management
5 Long-Term Management Overview
5.1 Remedy Components
5.2 Basis for Predicting Performance and Decision Criteria
5.3 Periodic Evaluations
5.4 Decision Logic for Adaptive Site Management
5.5 Completion Strategy
5.6 Project Risks and Uncertainty
6 Case Studies (Part One)
6 Case Studies Overview
6.1 Koppers Oroville Wood Treatment Facility, California
6.2 Moffett-MEW Regional Plume, California
6.3 Rocky Flats Solar Ponds Plume, Colorado
6.4 Rocky Mountain Arsenal, Colorado
6.5 Naval Air Station Jacksonville OU 03, Florida
6.6 DOE Test Area North, INEEL, Idaho
6.7 Joliet Army Ammunition Plant, Illinois
6.8 Tri-State Mining District (Kansas, Oklahoma, Missouri)
6 Case Studies (Part Two)
6.9 Paducah Gaseous Diffusion Plant (PGDP) Groundwater, Kentucky
6.10 Velsicol Chemical, Michigan
6.11 Onondaga Lake, New York
6.12 Former UGI Columbia Manufactured Gas Plant, Columbia, Pennsylvania
6.13 Savannah River Site (SRS) F-Area Seepage Basins Groundwater, South Carolina
6.14 Former Naval Weapons Industrial Reserve Plant, McGregor, Texas
6.15 Hanford 200 Area ZP-1 OU, Washington
6.16 Industrial Site, Australia
7. Stakeholder Perspectives
Additional Information
Appendix A. Survey Results
Appendix B. Summary of Tools For Site Characterization
References
Acronyms
Glossary
Acknowledgments
Team Members and Contact Information
Document Feedback

 

Remediation Management of Complex Sites
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5.6 Project Risks and Uncertainty

Successful long-term management is flexible enough to adapt to technical difficulties, changing site conditions (for instance, as a result of changes in regional pumping or climate change), changes in available technologies, stakeholder involvement, regulatory compliance, and other financial and legal factors. These variables are included in the process through the long-term management plan’s evaluation of project risks and uncertainty.

The long-term management plan includes a comprehensive and descriptive strategy to identify and respond to key project risk events that warrant planning a contingency response (ITRC 2011d, 2012). The risk register and contingency planning tools described in previous ITRC guidance (ITRC 2012) may be particularly useful for assessing long-term risk at complex sites. This guidance includes a risk management checklist to help identify significant site-specific uncertainty factors that may result in project risks and uncertainties, including stratigraphy, contaminant behavior, effects of climate change and other changing site conditions, technology implementation, and regulatory issues. Project risks and uncertainty can also result from inadequate site characterization, CSM data gaps, and from design assumptions and limitations in technology application. Appropriate steps (for example, characterization to fill data gaps, pilot testing, and monitoring) may be added to the long-term management plan to address significant uncertainties.

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