Crude oil pipeline, third-party damage : Pipeline de pétrole brut-dommages causés par des tiers à la canalisation de pétrole brut de 610 millimètres de diamètre appartenant à la Trans Mountain Pipeline L.P. à la borne kilométrique 3,10 de la conduite de transfert du quai Westridge à Burnaby (Colombie-Britannique), le 24 juillet 2007

The design drawings that were part of the construction contract had notes related to the three conditions mentioned above and also indicated the following: the lateral connections were to cross the Westridge Pipeline with a minimum clearance of 0.3 m; the sewer line was to parallel the Westridge Pipeline with a minimum clearance of 1.5 m; and the required crossing permits from KMC were to be [...] The Westridge Dock operator (WDO), at the request of the BTO, closed the delivery valves to the tanker, effectively stopping crude oil deliveries, assuming that the emergency was related to the tanker loading that was underway. [...] Fifteen minutes after the rupture, the CCO noted that the SCADA system still indicated a flow rate on the Westridge Pipeline even though the delivery pumps at the Burnaby Terminal had been shut down and the delivery valves to the tanker had been closed. [...] Immediately after isolating the pipeline from the Burnaby Terminal, the BTO asked the WDO to open the delivery valves to drain down the Westridge Pipeline into the tanker, in accordance with KMC‘s emergency shut-down procedures. [...] The survey also showed that the sewer trench was excavated according to the design offset of 11.3 m. At the rupture site, the survey revealed that the Westridge Pipeline was only 1.5 m from the centreline of the sewer trench, instead of the 2.8 m separation that had been shown on the design drawings Rev.