Regina 鈥� It鈥檚 going to take a little while longer to find out why a Husky Energy pipeline leaked into the North Saskatchewan River on July 21.
On Oct. 20 Husky asked for, and was granted, a 30 day extension by the Ministry of the Economy in reporting its findings.
Doug MacKnight, assistant deputy minister of the petroleum and natural gas division with the Ministry of the Economy, said on Oct. 21, 鈥淗usky has requested and been granted a 30 day extension for the submission of certain technical reports related to the incident under section 21(2) of The Pipeline Regulations, 2000.聽 Their request was granted.
鈥淭he additional time was needed to complete a metallurgic report on the failed pipeline as well as geotechnical report on lands where the failure occurred. Both of these reports are being prepared for Husky by a third-party engineering firm.聽 Based on these technical reports, Husky will be providing its assessment of the cause of the July 21 incident on or before Monday, Nov. 21, 2016. 聽Husky鈥檚 final report will include the background studies supporting its conclusions as to the cause of the failure.鈥�
Husky has submitted an additional report on the incident, which was released to the media by the province on Oct. 21.
The total ground area of the spill was reported as 41,500 square metres, although MacKnight noted, 鈥淲e have work to do to understand how Husky actually calculated it. Obviously, we need to true it up with our own work in the investigation.鈥�
All of that area was off-lease. The volume, as earlier reported, was 225 cubic metres, plus or minus 10 per cent. The recovered amount is listed as 210 cubic metres, and the lost amount is 15 cubic metres.
There was a total of 4,303 cubic metres of soil recovered, 551 cubic metres of water and 349 tonnes of vegetation.聽
鈥淚t鈥檚 important to note that Husky鈥檚 final report on the incident, which is due in November, is just one part of a broader investigation we鈥檙e undertaking with regard to the cause of the failure, MacKnight said. The Ministry of Economy, Ministry of Environment, Water Security Agency and Attorney General鈥檚 office are all involved in the investigation and overseeing Husky鈥檚 recovery work. Corporate records have been collected and analyzed and Husky officials and staff have been interviewed.
Skystone International, a Calgary engineering firm, has been providing advice to the Ministry of the Environment throughout this time. MacKnight said, 鈥淪kystone has considerable expertise in major pipeline investigations in Canada and has been providing advice to the investigation group at each stage in the process.鈥�
Skystone has also been contracted to do additional research or studies to validate information provided by Husky.
鈥淥verall, the investigation is proceeding quite well. There鈥檚 still a lot of work ahead of the technical team in terms of analyzing the information collected, documenting the findings, and preparing the public report,鈥� he added.
The ministry is not providing timelines or preliminary findings at this time.
Ash Olesen, acting executive director for the environmental protection branch with Ministry of Environment, said, 鈥淲e have effectively moved from spill response to a remediation and reclamation status. To that end, the response team has demobilized the cleanup sites, including the removal of equipment and personnel.鈥�
There will be monitoring over the winter. He added that 93 per cent of the oil spilled has been recovered. More than 900 kilometres of shorelines was assessed, including both sides of the river and islands, from the spill entry point to a little past Prince Albert. More than 1,000 hot spots have been cleaned up as a result of that assessment.
鈥淲e consider the cleanup and assessment complete for 2016. That activity will resume in spring of 2017. This is all part of the scheduled discontinuation of cleanup efforts as winter approaches,鈥� Olesen said.
Pipeline Newsasked what sort of activity was expected in the springtime, and how whatever remains would be affected by ice and snow in the winter. Olesen said, 鈥淲e鈥檒l resume the shoreline cleanup and assessment protocols we鈥檝e established with Husky for the 2016 season that will actively resume in 2017. The degree and intensity of that shoreline assessment will be a function of whether there is or isn鈥檛 more observable sheen, an potentially the dispersement of any additional oil. That remains to be seen. But effectively the same activity we saw this summer/fall will resume in 2017, weather permitting.
Pipeline Newsthen asked how much, if anything, they expected to retrieve in the spring, nine months after the initial spill, and with only seven per cent unrecovered? Olensen replied, 鈥淭he expectation is that if there is anything to be retrieved, we will be actively requiring Husky to do so. It is everyone鈥檚 expectation, and hope, that given 93 per cent recovered, there isn鈥檛 much to see. But again, we鈥檒l see.鈥�
Sam Ferris with the Water Security Agency noted Prince Albert began using its river water intake on Sept. 19, the week following the all clear was given by the WSA. Additional water sampling has been requested, and no petroleum hydrocarbons have been detected. The city is also using additional powder-activated carbon in its water treatment process.
Melfort began re-using their intake on Codette Reservoir on Sept. 16 and has refilled its reservoir. No hydrocarbons have been detected there, either.
North Battleford was still relying on using its groundwater treatment plant (with four additional new wells) and its water supply line from the Town of Battleford.
鈥淭he construction of a previously planned pre-filtration system has not yet started, but equipment is being purchased and preliminary plans are in place to have it installed,鈥� Ferris said.
Dredging of the river near the surface water intake was delayed and scheduled to begin Oct. 24. The dredging was required due to natural siltation of the river and sand bar formation. This was supposed to happen in July, but the oil spill caused the delay.
