KDOT Survey & Layout Verification 5 — Questions and Answers
Question 1: What does a KDOT inspector check when verifying 'final cross-sections' for pay quantity calculations?
- That the contractor's crew size matches the plan estimate
- That measured end areas at each station match the work actually performed for earthwork payment (Correct answer)
- That the pavement thickness cores match design thickness
- That the number of slope stakes matches the number of stations
Correct answer: That measured end areas at each station match the work actually performed for earthwork payment
Final cross-sections are field-measured end areas at each station used with the average-end-area method to calculate earthwork pay quantities.
Question 2: A KDOT project encounters an existing utility that conflicts with the planned storm sewer alignment. Who has authority to approve a field adjustment to the pipe alignment?
- The contractor's superintendent may shift the pipe up to 2 feet without approval
- The KDOT project engineer must approve any alignment change via a plan revision or field order (Correct answer)
- The inspector may approve minor shifts if the utility is avoided
- The utility company representative approves all alignment changes
Correct answer: The KDOT project engineer must approve any alignment change via a plan revision or field order
Any change to the permitted plan alignment requires project engineer approval through a formal field order or plan revision to maintain contract compliance.
Question 3: When verifying guard rail layout on a KDOT project, what is the critical dimension the inspector confirms before post driving begins?
- Post wood species and treatment level
- Offset distance from the edge of traveled way to the face of rail (Correct answer)
- Rail height above the post cap
- Number of bolts per splice
Correct answer: Offset distance from the edge of traveled way to the face of rail
The face-of-rail offset from the traveled way is critical because it determines the guardrail's ability to redirect errant vehicles and is specified in KDOT Standard Plans.
Question 4: A KDOT inspector is reviewing a contractor's survey field notes. The notes show a backsight reading of 6.14 ft on a benchmark with elevation 1,150.32 ft. What is the Height of Instrument (HI)?
- 1,144.18 ft
- 1,150.32 ft
- 1,156.46 ft (Correct answer)
- 6.14 ft
Correct answer: 1,156.46 ft
HI = Benchmark elevation + Backsight reading = 1,150.32 + 6.14 = 1,156.46 ft.
Question 5: On a KDOT bridge project, the inspector verifies that bearing pads are set at the correct elevation. This elevation is most directly controlled by which survey element?
- The bridge deck finished grade profile
- The pier cap bearing seat elevation from structural plans (Correct answer)
- The approach slab subgrade elevation
- The low steel elevation of the bridge girder
Correct answer: The pier cap bearing seat elevation from structural plans
The bearing seat elevation on the pier cap is the controlling dimension for bearing pad placement, set by the structural engineer in the bridge plans.
Question 6: A KDOT inspector suspects a contractor has placed insufficient subbase material. Which method provides the most reliable check?
- Visually comparing the surface to adjacent stakes
- Taking grade rod readings at a grid of points and comparing to design subbase elevation (Correct answer)
- Probing with a steel rod to feel for the subbase layer
- Reviewing the contractor's material delivery tickets only
Correct answer: Taking grade rod readings at a grid of points and comparing to design subbase elevation
A grid of grade rod shots compared to design elevations provides direct, quantitative measurement of actual subbase depth across the area.
Question 7: During layout verification of a KDOT box culvert, the inspector checks 'skew angle.' What does skew angle define?
- The slope of the culvert floor relative to horizontal
- The angle between the culvert centerline and the roadway centerline (Correct answer)
- The bevel angle cut on the headwall wingwalls
- The angle of the cutoff wall below the footing
Correct answer: The angle between the culvert centerline and the roadway centerline
Skew angle is the angle between the culvert barrel centerline and the perpendicular to the road centerline, which affects headwall length and hydraulic alignment.
KDOT Survey & Layout Verification 5
What does a KDOT inspector check when verifying 'final cross-sections' for pay quantity calculations?