Execution Department

A department that provides the sewer inspection service.

Exfiltration

The leakage or discharge of flows being carried by sewers out into the ground through leaks in pipes, joints, manholes, or other sewer system structures; the reverse of “infiltrations.”

Exit Pit

An opening located at the exit of the cutting head or casing.

Exit Seal

Same as a launch seal except for the retrieval of the machine at the reception shaft. Used in high groundwater and unstable soils to prevent loss of ground.

Exit Shaft

See Reception ShaftExcavation into which the microtunneling equipment is driven and recovered..