Overcut

The theoretical difference between the radial measurement of the gauge cut and the MTBM shield; equal to (Gauge Cut OD – MTBM OD)/2. Actual overcut is reduced as the gauge cutter is worn and because of the differential cut.

Overflow

(1) The excess water that flows over the ordinary limits of a sewer, manhole, or containment structure. (2) An outlet, pipe, or receptacle for the excess water.

Owner

A public body of authority, corporation as partnership, or individual for whom the work in to be performed.

Oxidation

Loss of electrons, as when a metal goes from the metallic state to the corroded state.