Pre-Construction and Design Considerations
What the inspector must know cold
Before a single joint is strung, the inspector should be able to read the construction drawings and alignment sheets against the project specifications and the permit set. Understand class location and design factor, MAOP derivation, minimum cover tables, crossing designs (bores, HDDs, casings), and the clearance required between the new line and foreign utilities. Know the permit matrix: federal, state, and local approvals, plus separate agreements for railroad and highway crossings, watercourse crossings, and wetland or waterbody permits. Confirm that one-call (811) notification and potholing happened before excavation, and that right-of-way limits, environmental flagging, and cultural resource exclusion zones are staked.
Inspection planning
A candidate should understand inspection and test plans, hold points, witness points, and the difference between the owner's quality plan and the contractor's means and methods. Pre-construction meetings establish communication, documentation, and stop-work authority.
Traps
Questions often test role boundaries. The inspector verifies and documents conformance; the inspector does not redesign, approve a drawing revision, or direct the contractor's workforce. Another common trap is treating a permit as a suggestion - a permit condition can be more restrictive than the drawing, and the more restrictive requirement governs. Also expect questions on whether 811 clearance alone protects an excavation (it does not; potholing or vacuum excavation confirms actual depth and location).
Worked example
Rule of thumb: when a specification, a permit, and a drawing disagree, document the conflict, stop the affected activity, and escalate to the owner's design authority. Never resolve a dimensional conflict verbally in the field. If the drawing shows 36 in. of cover but the permit requires 48 in. through a cultivated field, the 48 in. governs until a written, approved revision exists.