TransCanada Pipelines is constructing two adjacent tank farms in central Alberta Canada. Separating the two tank farms is a railway spur line on a 13.5 metre high railway embankment. Seven interconnecting pipelines for communications, process pipelines and firewater pipeline were required in very close proximity. A relatively narrow right-of-way available, a water table close to ground surface, fine sandy soil conditions, site specific obstacles and very specific railway requirements created some difficult challenges for a multiple trenchless crossing solution. After a review of the available trenchless solutions, the guided slip bore technology was selected as it provided the answers to some of the site constraints. A unique crossing solution provided the answer to the high water table, sandy soil conditions and railway requirements. This paper will describe the site conditions and the means used to solve the many crossing difficulties.
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