It is AECOM, a very well-known, world-wide established EPC, EPCM, design and build, NEC designer: a very good company to work for and with. AECON is the construction wing. You will get at least 3 to 6 designs for an at-grade solution. 3 will be throw-aways i.e. not feasible, whereas, the remainder will have pros and cons for discussion.
Alberta sounds progressive with its approach, whereas, Calgary think they are but caught punching well above their weight: a common problem when amateurs manage megaprojects.