KDOT Survey & Layout Verification 2 — Questions and Answers
Question 1: When verifying a road centerline stakeout, what is the standard maximum allowable horizontal error for KDOT construction surveys?
- ±0.01 feet
- ±0.1 feet (Correct answer)
- ±0.5 feet
- ±1.0 feet
Correct answer: ±0.1 feet
KDOT construction surveys typically allow a maximum horizontal error of ±0.1 feet for centerline stakeout to ensure proper alignment.
Question 2: A KDOT inspector notices that slope stakes set by the contractor are missing after a rain event. What is the correct course of action?
- Allow the contractor to proceed using GPS only
- Require the contractor to re-establish slope stakes before earthwork continues (Correct answer)
- Estimate the slope stake locations from the plans
- Continue work and replace stakes after the next survey
Correct answer: Require the contractor to re-establish slope stakes before earthwork continues
Slope stakes must be re-established before earthwork continues to ensure cuts and fills are made to the correct grade and location.
Question 3: In KDOT surveying practice, what does the term 'P.I.' refer to on highway alignment plans?
- Project Inspector
- Point of Intersection (Correct answer)
- Pavement Index
- Profile Invert
Correct answer: Point of Intersection
P.I. stands for Point of Intersection, which is where two tangent lines of a horizontal curve meet.
Question 4: A contractor's grade rod reading at a benchmark check point is 4.82 feet, but the survey control record shows it should be 4.76 feet. What should the inspector do?
- Accept the difference as within tolerance
- Halt grading operations and notify the project engineer (Correct answer)
- Have the contractor add 0.06 feet of fill
- Record the discrepancy and continue work
Correct answer: Halt grading operations and notify the project engineer
A 0.06-foot discrepancy exceeds typical survey tolerance and may indicate a benchmark error or instrument issue, requiring engineer notification before work continues.
Question 5: When checking culvert pipe layout, which dimension does the KDOT inspector verify FIRST?
- Pipe diameter
- Flow line elevation (Correct answer)
- Pipe length
- Headwall dimensions
Correct answer: Flow line elevation
Flow line elevation is verified first because an incorrect invert elevation affects drainage performance and cannot be corrected after backfill.
Question 6: A KDOT project uses state plane coordinates for horizontal control. Which datum is Kansas required to reference?
- NAD 27
- NAD 83 (Correct answer)
- WGS 84
- NGVD 29
Correct answer: NAD 83
Kansas KDOT projects reference NAD 83 (North American Datum of 1983) for horizontal control per current KDOT survey standards.
Question 7: During bridge layout verification, the inspector measures the distance between two pier centerlines as 74.97 feet. The plan dimension is 75.00 feet. What is the appropriate action?
- Accept — 0.03 ft is within typical bridge layout tolerance (Correct answer)
- Reject — any deviation requires contractor correction
- Require the contractor to re-survey and document the discrepancy
- Flag the pier for structural review before accepting
Correct answer: Accept — 0.03 ft is within typical bridge layout tolerance
A 0.03-foot (3/8-inch) deviation is within the standard ±0.05-foot tolerance typically allowed for bridge pier layout on KDOT projects.
KDOT Survey & Layout Verification 2
When verifying a road centerline stakeout, what is the standard maximum allowable horizontal error for KDOT construction surveys?