I saw some pipeline construction west of the city for the past month and decided to go figure out where it was going. A few paths through fields were just for equipment access, so little less construction than I originally thought. It starts (or ends) at the new GTH natural node beside Dewdney at the west entrance. It runs west to just past the GTH, then runs north beside some power transmission lines. Then it turns east following power lines to the bypass zig zagging in a few spots following the power lines.
At the bypass it splits in two. One line going under the bypass beside the railcar plant to Pinkie. Shifts over towards the rail line, goes south under the rail line then turns east running along the railway towards Dojack. The other line follows the bypass, crosses the creek, then runs beside the 9th Ave N exit ramp to an exiting above ground natural gas pipe, so that is probably the starting point.
The line heading toward the city is a bit of a mystery.