NM CID GF-9 Practice Questions - New Mexico CID GF-9 Utility Lines Contractor Examination Exam

When setting a precast sanitary manhole on a new sewer, the outgoing invert should be set so that:

The flowline through the bench and invert matches the design elevations and provides a smooth channel through the structure The cover is 2 feet below finished grade to hide the lid The invert is above the rim to create a siphon All incoming pipes discharge onto a flat unbenched base

Correct Answer:

The flowline through the bench and invert matches the design elevations and provides a smooth channel through the structure

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