Government of the Environmental Liabilities as at March 31, 2016

Site Stage Glossary Phase I Environmental Site Assessment (ESA) – Historical review to determine potential contamination Phase II ESA – Sampling to determine if contamination is present. Phase III ESA – Sampling p g to delineate the extents of contamination. Remedial Action Plan (RAP) - A plan to remediate or clean up a contaminated site. Remediation – The act of remediating or cleaning up a site. Post Remediation Monitoring – Observing changes after remediation at a site over time. Monitoring – Observing changes at a site over time. Care and Maintenance – Activities to ensure a site remains safe and in a stable condition.

Location Type of Site Type of Contamination Site Stage Waste rock, hydrocarbons, Abandoned Mine metals, non-hazardous and Phase III ESA/RAP Site - Tom Mine hazardous materials. Abandoned Mine Metals, waste rock, and Yellowknife Phase III ESA/RAP Site - Burwash Mine hydrocarbons. Abandoned Mine Metals, hydrocarbons, waste Yellowknife Site - Crestaurum rock, non-hazardous and Phase III ESA/RAP Mine hazardous materials. Metals, hydrocarbons, waste Abandoned Mine Care and Yellowknife rock, non-hazardous and Site - Giant Mine Maintenance hazardous materials. Metals, decline, Abandoned Mine hydrocarbons, waste rock, Yellowknife Phase III ESA/RAP Site - Tin Mine non-hazardous and hazardous materials. Location Type of Site Type of Contamination Site Stage Abandoned Mine Waste rock, hydrocarbons, Yellowknife Site - Ptarmigan metals, non-hazardous and Phase III ESA/RAP Mine hazardous materials. Air Tanker Base - Post Remediation Fort Simpson Metals and hydrocarbons. Fort Simpson Monitoring Air Tanker Base - Fort Smith Metals and hydrocarbons. Phase III ESA/RAP Fort Smith Air Tanker Base - Yellowknife Metals and hydrocarbons. Phase III ESA/RAP Yellowknife Airport Wrigley Airport Hydrocarbons. Monitoring Airport Hydrocarbons. Remediation Deline Airport Hydrocarbons. Remediation Former Fuel Tank Tsiigethchic Hydrocarbons. Remediation Farm Site Former Fuel Tank Hydrocarbons. Remediation Farm Site Former Fuel Tank Fort McPherson Farm & Re-Supply Hydrocarbons. Remediation Line Former Fuel Tank Hydrocarbons. Remediation Farm Site Former Fuel Tank Gameti Hydrocarbons. Remediation Farm site Former marine Wrigley Hydrocarbons. Remediation pipeline area Deline Fuel Tank Farm Hydrocarbons. Remediation Helibase - Fort Post Remediation Fort Simpson Metals and hydrocarbons. Simpson Monitoring Helibase - Frank Behchoko Metals and hydrocarbons. Monitoring Channel Hay River Helibase - Hay River Hydrocarbons. Phase III ESA/RAP Location Type of Site Type of Contamination Site Stage Highway Enterprise Hydrocarbons and chlorides. Remediation Maintenance Facility

Fort Simpson - Highway Hydrocarbons. Phase III ESA/RAP Checkpoint Maintenance Facility

Highway Buffalo River Hydrocarbons and chlorides. Remediation Maintenance Facility

James Creek Maintenance Facility - Highway Hydrocarbons. Phase III ESA/RAP Dempster Highway Maintenance Facility (No. 8 - Km 14) 33 Community Various Hydrocarbons and metals. Monitoring Landfills Hydrocarbons, glycols and Deline Community Landfill Remediation metal. 5 Community Various Landfills - Hydrocarbons. Monitoring Decommissioned Old oil and gas Peel Channel Hydrocarbons and metals. Phase II ESA staging site Other - Commercial Hydrocarbons. Remediation Lot Other - Abandoned Hydrocarbons, glycols and Yellowknife Site (unauthorized Remediation metal. use) Other - Abandoned Hydrocarbons, glycols and Yellowknife Site (unauthorized Remediation metal. use) Other - Abandoned Hydrocarbons. Phase II/III ESA Site Icicle Inn Location Type of Site Type of Contamination Site Stage Bretzlaff Drive Yellowknife Metals and hydrocarbons. Monitoring Complex Other - Former Hydrocarbons. Phase II ESA Above Ground Pool Perchloroethylene (PCE) and Other - Former site Norman Wells volatile organic compounds Remediation of Drycleaner (VOCs). Other - LOT 536, LTO3617 (Parking Hydrocarbons. Remediation Garage - Old, Morgue) Other - Parking Hydrocarbons. Remediation Garage (Old) Other - Water Wrigley Hydrocarbons. Remediation Treatment Plant Other- Former Fort Good Hope School Hydrocarbons. Remediation site. Other- Health Tsiigehtchic Hydrocarbons. Remediation Centre Ft Providence (Dory Other- Marine Hydrocarbons. Phase II ESA Point) Compound 40 Miles Southeast Other- old Hydrocarbons. Phase II ESA of Norman Wells staging/drilling area

Hay River/Pine Point Other- Railbed Hydrocarbons and metals. Phase II ESA Other- School - Fuel tank removal and related Hydrocarbons. Remediation contamination on school property Location Type of Site Type of Contamination Site Stage Other- School - Fort Smith property Hydrocarbons. Remediation contamination Other- School Fort McPherson Hydrocarbons and metals. Remediation Property Other- School Hydrocarbons. Remediation Property Hydrocarbons, metals, non- Great Slave Lake Other- Snowfield hazardous and hazardous Phase II ESA materials. Other- Trespass Site- Fort Resolution Hydrocarbons. Monitoring Active Lot 27 Community Metals, Total Coliforms, and Various Monitoring Sewage Lagoons E.Coli. Community Sewage Metals, Total Coliforms, and Deline Remediation Lagoon E.Coli