Coeur d’Alene Basin TLG Repository PFT meeting December 9, 2003

2 Meeting Goal Build a Project Focus Team to participate in identifying and evaluating viable repository sites and assist in completing a preliminary design for one repository in 2004.

3 Agenda 1.Review of Repository Language in Basin Workplans 2.Background and Current Status 1995 repository guidelines 1998 location analysis 2002 ROD language Summary of Basin & Box repositories 2002 IDEQ location analysis Big Creek update EPA/IDEQ 2004 gameplan 3.Path Forward

Basin Workplan 1.Big Creek Repository will support residential yard remediation 2.Additional repository capacity deferred to Five-Year Basin workplan

5 Five-Year Basin Workplan 1.Utilize Big Creek Repository for yard soils 2.Bring on-line, as needed, repositories to support cleanup 3.Bring on-line repository to support ICP 4.Plan and secure priorities to be ready for Upper and Lower Basin remediation work for the next 5-10 years

Basin Workplan 1.Operate and construct improvements to Big Creek Repository 2.Site and design additional repositories (which will also support the ICP)

7 Agenda 1.Review of Repository Language in Basin Workplans 2.Background and Current Status 1995 repository guidelines 1998 location analysis 2002 ROD language Summary of Basin & Box repositories 2002 IDEQ location analysis Big Creek update EPA/IDEQ 2004 gameplan 3.Path Forward

8 Coeur d’Alene Basin Restoration Project: Guidelines for Mine Tailings Repositories Developed in 1995 Collaborative effort Non-regulatory guidelines Still appropriate and relevant to guide repository scoping and development process Addresses: Location, Design, Construction, and Management

Basin Repository Analysis Performed by Coeur d’Alene Tribe with input from multiple stakeholders Used Geographic Information System technology to investigate potential locations Produced maps, GIS database, and list of 169 potential sites Served as foundation for 2002 IDEQ study

10 What did the ROD say about repositories? No specific locations identified Described 4-step process: 1.Site identification 2.Technical evaluation 3.Public input/notification 4.Decision documentation

11 Location and design requirements 1.Prevent adverse human health and ecological impacts and result in improvements wherever possible 2.Prevent additional groundwater and/or surface impacts 3.Integrate with past or nearby cleanup efforts 4.Comply with all Applicable or Relevant and Appropriate Requirements (ARARs) 5.Be appropriate for the characteristics of the waste that will be disposed there 6.Be cost-effective 7.Minimize long-term Operations & Maintenance costs

12 Additional considerations 1.Transportation impacts and costs 2.Economic development or future reuse of the site where feasible 3.Geotechnical stability 4.Availability of clean cover material 5.Community acceptance

13 Summary of Basin and Box repositories Ongoing effort Have evaluated 5 Box and 4 Basin repositories No standard for location, size, or design Common features: placement on previously impacted areas (e.g., tailings ponds); no engineered liners (with a few exceptions); most have engineered covers (growth media vs. impermeable membrane)

IDEQ Location Analysis Used 1998 GIS database Focused on upper basin Conducted screening site visits Collected information on potential capacity, proximity to remedial action and residences, site access, surface water, and existing conditions Assigned a good, average, or poor rating to each of 7 attributes Property ownership was not considered

15 Big Creek Repository Update 2002 – Supported yard remediation program (prior to ROD) 2002/2003 – Site investigation/engineering evaluation 2003 – Supported yard remediation program 2003 – Ownership transferred to IDEQ Design is being completed (overall capacity and closure requirements) Drafting technical memorandum to document compliance with ROD requirements

16 EPA/IDEQ 2004 Gameplan EPA funding IDEQ to lead repository efforts 2004 Scope: 1.Identify and complete preliminary design for repository (greater than 25,000 cy) to support ongoing cleanup and ICP 2.Operate Big Creek repository

17 Agenda 1.Review of Repository Language in Basin Workplans 2.Background and Current Status 1995 repository guidelines 1998 location analysis 2002 ROD language Summary of Basin & Box repositories 2002 IDEQ location analysis Big Creek update EPA/IDEQ 2004 gameplan 3.Path Forward

18 Path Forward Meeting Goal: Build a Project Focus Team to participate in identifying and evaluating viable repository sites and assist in completing a preliminary design for one repository in Proposal: Constructive and collaborative site identification and evaluation process (see flowchart)