Edmonton, Alberta-based construction firm PCL Construction and engineering company Stantec have won a $121 million fixed price design-build contract for the Southeast Treatment Plant Biogas Utilization Project in San Francisco, according to a Jan. 23 news release from PCL. … The project will treat the biogas, generated as a byproduct of wastewater treatment at the Southeast Treatment Plant, in the new digesters to transform it to renewable natural gas quality for injection into the nearby Pacific Gas and Electric gas pipeline, per the release.