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Preliminary Remedial Action Plan Preliminary Remedial Action and Risk Management Plan for Gordon Lake Mine Sites, Gordon Lake, Northwest Territories Prepared for: Public Works and Government Services Canada Public Works and Government Services Canada Prepared by: Stantec Consulting Ltd., 102 - 40 Highfield Park Drive, Dartmouth NS B3A 0A3 February 23,2015 Revision Record Revision Description Prepared By Checked By Approved By 1 Draft P.Coyne P.C D.Wilson DW M.Doucet MD PRELIMINARY REMEDIAL ACTION AND RISK MANAGEMENT PLAN FOR GORDON LAKE MINE SITES, GORDON LAKE, NORTHWEST TERRITORIES Executive Summary Stantec Consulting Ltd. (Stantec) was retained by Public Works and Government Services Canada (PWGSC) – Northern Contaminated Sites Group to prepare a Preliminary Remedial Action Plan (RAP) for the remediation of nine former mine sites on or near Gordon Lake in the Northwest Territories (herein referred to as the Project). The following preliminary RAP is based on the findings of previous assessment programs completed at each of the sites and on the results of the remedial options analyses (ROA) completed by Stantec. In addition, the RAP incorporates the revised impacted soil volumes calculated during completion of the human health and ecological risk assessment (HHERA). The remedial options that have been recommended for the wastes at each of the sites are presented below: • Physical Hazards: − Install engineered caps over the shafts and deep trenches − Backfill shallow trenches with waste rock − Slope mounds or other stockpiled material to match the surrounding topography − Remove physical hazards from water, if present • Non-hazardous Waste: − Consolidate wood waste and burn on-site − Consolidate, transport and dispose of the non-hazardous waste at the NHW Landfill to be constructed at the Camlaren site. • Hazardous Waste: − Asbsetos containing materials (ACMs): Consolidate and dispose off-site at the NHW Landfill to be constructed at the Camlaren site. − All other hazardous waste: Consolidate and dispose off-site at an approved disposal facility. • PHC and/or Metal Impacted Soil and Tailings: − Excavate, transport and dispose of the impacted soil and/or tailings at the NHW Landfill to be constructed at the Camlaren site. • Waste Rock − Potentially acid generating (PAG) waste rock / ore: Cap in place or excavate and dispose at a centralized location. − Non-PAG waste rock / ore: Grade and utilize as backfill when addressing physical hazards. • Water: − Treat in an on-site modular water treatment system tailored to specific contaminants of concern (CoCs). () Stantec File 121413300 i PRELIMINARY REMEDIAL ACTION AND RISK MANAGEMENT PLAN FOR GORDON LAKE MINE SITES, GORDON LAKE, NORTHWEST TERRITORIES Upon further evaluation of the remedial options available for sediment, Stantec has determined that the remedial option presented for sediment in the ROA required revision. The sediment impacts present at the sites were determined to pose little to no risk to the environment. As such, Stantec has recommended that impacted sediment remains in place. This preliminary RAP is limited by the findings of the previous assessment programs and will require revision upon the collection of additional data (i.e. from the 2015 assessment program). () Stantec File 121413300 ii PRELIMINARY REMEDIAL ACTION AND RISK MANAGEMENT PLAN FOR GORDON LAKE MINE SITES, GORDON LAKE, NORTHWEST TERRITORIES Table of Contents EXECUTIVE SUMMARY ............................................................................................................... I 1.0 INTRODUCTION ............................................................................................................. 1 2.0 SCOPE OF WORK ........................................................................................................... 1 3.0 BACKGROUND .............................................................................................................. 2 3.1 SITES AND AREA DESCRIPTION ......................................................................................... 2 3.1.1 Overview of the Biophysical Conditions...................................................... 4 3.2 SITE HISTORY ....................................................................................................................... 4 3.2.1 Camlaren Mine (SM205) ................................................................................ 4 3.2.2 Burnt Island (SM320) ....................................................................................... 5 3.2.3 Goodrock Mine (SM466)................................................................................ 5 3.2.4 Kidney Pond Mine (SM474) ........................................................................... 5 3.2.5 Murray Lake (SM490) ...................................................................................... 6 3.2.6 Storm Property (SM483) .................................................................................. 6 3.2.7 Treacy Mine (SM475) ...................................................................................... 6 3.2.8 Try Me (SM488) ................................................................................................ 7 3.2.9 West Bay Mine (SM302) .................................................................................. 7 3.3 PREVIOUS STUDIES ............................................................................................................. 7 3.3.1 Remedial Options Analysis ............................................................................ 9 3.3.2 Human Health and Ecological Risk Assessment ....................................... 11 3.4 SEDIMENT .......................................................................................................................... 13 4.0 REGULATORY CONSIDERATIONS ................................................................................ 13 4.1 CANADIAN ENVIRONMENTAL QUALITY GUIDELINES .................................................. 14 4.2 FCSAP DECISION-MAKING FRAMEWORK ..................................................................... 15 4.2.1 Risk Management......................................................................................... 15 5.0 INTEGRATED REMEDIAL/RISK ACTION PLAN .............................................................. 16 5.1 RISK ASSESSMENT RESULTS .............................................................................................. 16 5.2 NON-HAZARDOUS WASTE .............................................................................................. 18 5.2.1 Wood Waste .................................................................................................. 18 5.2.2 Other Non-Hazardous Waste ...................................................................... 18 5.3 HAZARDOUS WASTE ........................................................................................................ 19 5.3.1 Asbestos Containing Materials ................................................................... 19 5.3.2 Lead Based Paint Materials ......................................................................... 19 5.3.3 Liquid Organic Waste .................................................................................. 19 5.4 SOIL, SEDIMENT AND TAILINGS ...................................................................................... 19 5.4.1 Soil and Tailings ............................................................................................. 20 5.5 WASTE ROCK ................................................................................................................... 21 5.5.1 Non-PAG Waste Rock .................................................................................. 21 5.6 WATER............................................................................................................................... 21 () Stantec File 121413300 PRELIMINARY REMEDIAL ACTION AND RISK MANAGEMENT PLAN FOR GORDON LAKE MINE SITES, GORDON LAKE, NORTHWEST TERRITORIES 5.7 PHYSICAL HAZARDS ........................................................................................................ 22 6.0 GEOTECHNICAL CONSIDERATIONS ........................................................................... 22 6.1 SITE ACCESS ..................................................................................................................... 22 6.2 BORROW SOURCES ......................................................................................................... 23 7.0 CONCEPTUAL REMEDIAL DESIGN ............................................................................... 24 7.1 REGULATORY APPROVALS ............................................................................................. 24 7.1.1 Stakeholder / Community Meetings .......................................................... 24 7.2 BORROW MATERIAL STAGING ....................................................................................... 24 7.3 WASTE STAGING AREA ................................................................................................... 25 7.4 NON-HAZARDOUS WASTE LANDFILL ............................................................................. 25 7.4.2 Water Treatment System ............................................................................. 26 7.4.3 Waste Rock Cover System .......................................................................... 26 8.0 SITE REQUIREMENTS FOR REMEDIATION ..................................................................... 26 8.1.1 Camp ............................................................................................................
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