During planned integrity dig activities on Enbridge’s Line 21 (Norman Wells Pipeline) the week of February 4, 2013, the excavation crew encountered potentially contaminated soil in the immediate vicinity of the pipe in two locations. There is no free product requiring recovery at either site. The location of the first dig was kilometer post 457 on the line, approximately 60 kms west of Fort Simpson; the second at kilometer post 391. These sites were selected for investigation using high resolution pipeline inspection technology. In each case, the pipeline was shut down as a precautionary measure until repair sleeves were installed. Further investigation is being conducted at each site.

At KP 457 the lab analysis of the preliminary soil sample was completed and has indicated the presence of hydrocarbons. Approximately thirty cubic metres of potentially contaminated soil has been quarantined. Enbridge has completed installation of a repair sleeve at this location and is continuing a thorough environmental assessment with on-site support from third-party experts.

At KP 391, excavation has been completed and a repair sleeve installed. The line has been restarted. An estimated 60 to 70 cubic metres of potentially contaminated soil has been quarantined. An initial environmental assessment began immediately, and additional third party Environmental personnel were mobilized to this site to continue the assessment.

Enbridge has filed separate notifications to the NWT/NU Spill Report Line and has notified federal pipeline regulators and members of the local communities. The cause of the contamination at the two sites has not been determined and is being thoroughly investigated.

Enbridge places the highest priority on safety and operational performance. Our integrity dig program is an important component of our ongoing pipeline monitoring and inspection program intended to ensure the operating fitness of our pipelines and prevent incidents. For more information on our integrity dig program, visit www.enbridge.com/integrity.