PS Construction Layout & Staking 2

Question 1

When setting slope stakes for a highway cut section, which measurement is critical for determining the catch point?

Accepted Answer

Horizontal distance from centerline to where the cut slope meets natural ground

Answer

The catch point is where the cut slope intersects natural ground surface, found by measuring horizontal distance from centerline at the calculated slope ratio.

Question 2

A retaining wall footing must be set at elevation 412.75. The instrument HI is 418.32. What rod reading is needed to set the footing elevation?

Accepted Answer

5.57

Answer

The required rod reading = HI − desired elevation = 418.32 − 412.75 = 5.57 ft.

Question 3

For bridge pier layout, which technique is most reliable for establishing pier centerlines over water?

Accepted Answer

Intersection from two shore control points using total station

Answer

Intersecting lines of sight from two shore-based control points using a total station provides precise pier centerline location over water without direct access.

Question 4

In road construction staking, what does a blue-top stake indicate?

Accepted Answer

Subgrade elevation has been reached at that point

Answer

A blue-top stake is driven so its top is flush with the design subgrade elevation, giving the grading contractor a visual target.

Question 5

A storm drain inlet is to be located 42.5 ft right of centerline station 18+75. Which field operation locates it correctly?

Accepted Answer

Measure along the perpendicular from the centerline stake at 18+75 to 42.5 ft offset

Answer

Construction offsets are always measured perpendicular to the baseline at the specified station.

(PS) Professional Licensed Surveyor Practice Test

(PS) Professional Licensed Surveyor Practice Test

PS Construction Layout & Staking 2