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Engineering Evaluation/Cost Analysis Report Elizabeth Mine South Strafford, Vermont Final Report

Final Report Prepared for U.S. Army Corps of Engineers New England District Concord, Massachusetts

12 March 2002

Arthur D. Little, Inc. Acorn Park Cambridge, Massachusetts 02140-2390 Contract No. DACW33-00-D-0002 Delivery Order 0002 Arthur D. Little Reference 76071

Table of Contents Page List of Acronyms ............................................................................................................ v Executive Summary.................................................................................................. ES-1 1.0 Introduction .......................................................................................................... 1-1

1.1 Purpose and Scope.......................................................................................... 1-1 1.2 Report Organization........................................................................................ 1-2 1.3 Site Description.............................................................................................. 1-2 1.3.1 Historical Summary.............................................................................. 1-2 1.3.2 Statement of Significance ..................................................................... 1-4 1.3.3 Surficial and Bedrock Geology............................................................. 1-5 1.3.4 Climate ................................................................................................. 1-6 1.4 Previous Removal Actions ............................................................................. 1-6 1.4.1 Previous EPA Cleanup Actions............................................................. 1-6 1.4.2 Response Actions by the State of Vermont or Federal Agencies ........... 1-6 1.5 Previous Investigations ................................................................................... 1-7 1.6 Source, Nature, and Extent of Contamination................................................ 1-9 1.6.1 Tailings and Waste Rock ...................................................................... 1-9 1.6.2 Soil Contamination ............................................................................. 1-11 1.6.3 Ground Water Contamination............................................................. 1-12 1.6.4 Surface Water and Sediment Contamination....................................... 1-13 1.6.5 Conceptual Site Model........................................................................ 1-15 1.6.6 Site Physical Characteristics That Impact Alternative Evaluation....... 1-16 1.7 Streamlined Risk Evaluation........................................................................ 1-16 1.7.1 Ecological Risk Assessment................................................................ 1-17 1.7.2 Streamlined Human Health Risk Assessment...................................... 1-24 1.7.3 Selection of Preliminary Removal Goals............................................. 1-25 2.0 Identification of Removal Action Scope and Objectives ................................ 2-1

2.1 Statutory Limits on Non-Time-Critical Removal Actions (NTCRA) ............ 2-1 2.2 Conditions That Justify a Removal Action..................................................... 2-2 2.3 Applicable or Relevant and Appropriate Requirements................................. 2-4 2.3.1 Terms and Definitions........................................................................... 2-4 2.3.2 Location-Specific ARARs .................................................................... 2-7 2.3.3 Chemical-Specific ARARs ................................................................. 2-11 2.3.4 Action-Specific ARARs...................................................................... 2-11 2.4 Non-Time Critical Removal Action Schedule.............................................. 2-14 3.0 Development of Removal Action Alternatives...
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