Which document would you consult to trace all sewer lines and their connections to manholes?

• A. Site Plan
• B. Process Diagram
• C. Collection System Map
• D. As-Built Drawing

Answer: (C)

The document you need is one that maps the sewer network itself—showing all mains, laterals, and how each line connects to manholes. That kind of map is built to trace the entire collection system, so you can follow a line from a street to every connection and manhole, understand flow paths, and plan maintenance or repairs. It often includes line identifiers, manhole locations, and connection points, making it the most reliable reference for tracing the network.

A site plan focuses on property boundaries and surface features, not the detailed sewer network. A process diagram shows how a facility’s processes flow, not the underground piping layout. An as-built drawing records what was constructed for a specific project or building, but it may not comprehensively document the municipal collection system and its connections.