What do TRIMET managers actually do?

Portland, Ore.-based TriMet says it has selected CH2M Hill provide on-call construction management services for the Portland to Milwaukie light rail transit extension project. The 7.3-mile, $1.4 billion project will connect Portland State University in downtown Portland with southeast Portland, Milwaukie, and north Clackamas County.

Englewood, Colo.-based CH2M Hill will provide construction, procurement and management, and risk analysis and management services, TriMet says. The company will also review construction proposals, conduct change order analysis, provide quality assurance and quality control, and lead safety and field inspections.
http://www.railwayage.com/breaking-news/trimet-chooses-manager-for-lrt-project-3774.html