TransCanada to undergo audit by Canadian National Energy Board CALGARY, Alberta, Nov. 2 (UPI) -- A Canadian energy regulator said it expects pipeline company TransCanada to provide supporting evidence that it's in compliance with national laws. The Canadian National Energy Board sent a letter to pipeline TransCanada stating its policies would be audited to verify compliance with national safety and management standards. NEB Secretary Sheri Young said the audit would focus on TransCanada's risk assessment, inspection and monitoring protocols. "The board expects TransCanada to demonstrate and provide adequate supporting documentation of, the adequacy and effectiveness of its integrity management program as well as its compliance with," her letter states. The NEB in mid-October expressed concern about the company's safety record. The regulator was responding to a May letter filed by a TransCanada employee, who is no longer with the company, that said the company wasn't following the letter of the law. Environmental advocacy groups have expressed concern about the safety of shipping tar sands oil through pipelines. They contend that type of crude oil may be corrosive. A 2010 tar sands oil spill in Michigan by TransCanada rival Enbridge was the costliest onshore incident of its kind in the history of the energy industry. TransCanada this week announced it formed a partnership with Phoenix Energy Holdings Ltd., a subsidiary of PetroChina, to build a 310-mile tar sands pipeline from Alberta province.