Final River Mile 10.9 Removal Action Final Design Report, Lower Passaic River Study Area Prepared for Cooperating Parties Group, Newark, New Jersey July 31, 2013 One South Main Street Suite 1100 Dayton, OH 45402 Contents Acronyms and Abbreviations .............................................................................................................................. vii 1 Introduction ......................................................................................................................................... 1‐1 1.1 Project Description .......................................................................................................................... 1‐1 1.2 Removal Action Objectives .............................................................................................................. 1‐2 1.3 Engineering Design Packages ........................................................................................................... 1‐2 1.3.1 Dredging and Barge Transportation ................................................................................... 1‐3 1.3.2 Stabilization ........................................................................................................................ 1‐3 1.3.3 Capping ............................................................................................................................... 1‐3 1.3.4 Overland Transportation and Final Disposal ...................................................................... 1‐3 2 Applicable or Relevant and Appropriate Requirements ........................................................................ 2‐1 2.1 Chemical‐Specific ARARs ................................................................................................................. 2‐2 2.2 Action‐Specific ARARs ...................................................................................................................... 2‐2 2.3 Location‐Specific ARARs .................................................................................................................. 2‐3 3 Relevant Site Conditions ...................................................................................................................... 3‐1 3.1 Area Description .............................................................................................................................. 3‐1 3.2 Geology ............................................................................................................................................ 3‐1 3.3 Groundwater ................................................................................................................................... 3‐2 3.4 In Situ Physical and Chemical Characteristics .................................................................................. 3‐2 3.4.1 Chemical Properties ............................................................................................................ 3‐2 3.4.2 Physical Properties ............................................................................................................. 3‐3 3.5 Hydrodynamics ................................................................................................................................ 3‐3 3.6 Climate Conditions ........................................................................................................................... 3‐4 3.7 Bridges ............................................................................................................................................. 3‐5 4 Dredging .............................................................................................................................................. 4‐1 4.1 Design Criteria ................................................................................................................................. 4‐1 4.2 Estimated Volume of Dredged Material .......................................................................................... 4‐1 4.2.1 Sediment ............................................................................................................................. 4‐1 4.2.2 Debris .................................................................................................................................. 4‐1 4.2.3 Slope Stability ..................................................................................................................... 4‐2 4.2.4 Utilities ................................................................................................................................ 4‐2 4.3 Dredge Performance Criteria ........................................................................................................... 4‐2 4.3.1 Equipment Type and Size ................................................................................................... 4‐2 4.3.2 Position Accuracy and Dredge Tolerance ........................................................................... 4‐3 4.3.3 Production Rate .................................................................................................................. 4‐3 4.3.4 Dredging Operations ........................................................................................................... 4‐4 4.3.5 Material Transport .............................................................................................................. 4‐5 4.3.6 River Operations ................................................................................................................. 4‐5 4.3.7 Hours of Operation ............................................................................................................. 4‐6 4.3.8 Operability, Reliability, and Maintainability ....................................................................... 4‐6 4.4 Resuspension Management ............................................................................................................ 4‐6 4.4.1 Relevant Site Conditions and Impact on Resuspension Risks ............................................. 4‐6 4.4.2 DREDGE Model ................................................................................................................... 4‐8 4.4.3 Proposed Resuspension Control Approach ........................................................................ 4‐8 4.4.4 Silt Curtains ......................................................................................................................... 4‐9 4.4.5 Rationale for No Sheet Pile Wall ......................................................................................... 4‐9 4.5 Waterside Site Requirements ........................................................................................................ 4‐10 iii CONTENTS, CONTINUED 4.6 Environmental Constraints ............................................................................................................ 4‐10 4.6.1 Water Quality ................................................................................................................... 4‐10 4.6.2 Air Quality ......................................................................................................................... 4‐16 4.6.3 Noise ................................................................................................................................. 4‐16 4.7 Project and Community Health and Safety ................................................................................... 4‐17 5 Rationale for Not Conducting Sediment‐Washing Pilot Test(s) ............................................................. 5‐1 6 Sediment Treatment: Stabilization ....................................................................................................... 6‐1 6.1 Design Criteria ................................................................................................................................. 6‐1 6.2 Preliminary Design Elements ........................................................................................................... 6‐1 6.2.1 Barge Water Removal ......................................................................................................... 6‐2 6.2.2 Material Off‐Loading .......................................................................................................... 6‐2 6.2.3 Material Separation ............................................................................................................ 6‐3 6.2.4 Stabilization ........................................................................................................................ 6‐3 6.2.5 Material Storage ................................................................................................................. 6‐3 6.2.6 Water Treatment ................................................................................................................ 6‐3 6.3 Waterside Site Requirements .......................................................................................................... 6‐3 6.4 Hours of Operation .......................................................................................................................... 6‐3 6.5 Environmental Constraints .............................................................................................................. 6‐4 6.6 Sediment Stabilization Monitoring .................................................................................................. 6‐4 6.7 Operability, Reliability, and Maintainability ...................................................................................