KDOT Survey & Layout Verification 4

Question 1

A contractor uses GPS machine control for grading but the design surface file is from an older revision. What is the inspector's primary concern?

Accepted Answer

The machine may grade to superseded design elevations causing incorrect subgrade

Answer

If the GPS machine control surface file is from a superseded plan revision, the contractor may grade to incorrect elevations, requiring costly correction.

Question 2

What is the primary purpose of 'offset stakes' used in KDOT highway construction?

Accepted Answer

To preserve reference line information when the actual alignment stake would be disturbed by construction

Answer

Offset stakes are set at a known distance from the actual construction point so the reference can be recovered after earthwork disturbs the original stake.

Question 3

A KDOT inspector is verifying a retaining wall layout. The plan shows the wall face at Sta. 42+50, 12 feet right of centerline. The contractor has staked the face at 11.8 feet right. What action is required?

Accepted Answer

Require correction — wall face must be at exactly 12.0 feet

Answer

A 0.2-foot discrepancy in retaining wall layout exceeds typical tolerance and must be corrected before footing excavation to avoid encroachment or structural issues.

Question 4

When checking the vertical alignment of a highway project, the 'PVI' on the profile grade line refers to what?

Accepted Answer

Point of Vertical Intersection — where two grade lines meet

Answer

PVI stands for Point of Vertical Intersection, the point where two adjacent grade lines on a vertical curve plan intersect.

Question 5

A KDOT inspector finds that a drainage ditch has been graded 0.3 feet shallower than the plan cross-section. Which is the most likely negative consequence?

Accepted Answer

Insufficient hydraulic capacity may cause roadway flooding during storm events

Answer

A ditch that is shallower than designed has reduced cross-sectional area, which can cause it to overflow onto the roadway during design storm events.

(KDOT) Certified Kansas Department of Transportation Inspector Practice Test

(KDOT) Certified Kansas Department of Transportation Inspector Practice Test

KDOT Survey & Layout Verification 4