LARE LARE Grading and Earthwork 3

Question 1

According to ADA guidelines, the maximum running slope for an accessible pedestrian walkway not classified as a ramp is:

Accepted Answer

5%

Answer

ADA standards allow a maximum 5% running slope (1:20) for accessible routes before the path is classified as a ramp requiring handrails and landings.

Question 2

A landscape architect is interpolating contours between two spot elevations. Point A is at elevation 98.0 and Point B is at elevation 104.0, with a horizontal distance of 30 feet between them. Where does the 100-foot contour cross the line AB?

Accepted Answer

10 feet from Point A

Answer

The 100-ft contour is 2 ft above Point A; total rise = 6 ft over 30 ft, so 2/6 × 30 = 10 feet from Point A.

Question 3

Which erosion control measure is best suited for stabilizing a 3:1 (H:V) slope immediately after grading when revegetation will take 6–8 weeks to establish?

Accepted Answer

Erosion control blanket (ECB) pinned to the slope

Answer

Erosion control blankets protect the soil surface immediately, hold seed and moisture, and degrade naturally as vegetation establishes.

Question 4

A mass haul diagram is used in earthwork planning primarily to:

Accepted Answer

Determine the economical haul distance and direction of soil movement

Answer

A mass haul diagram shows cumulative earthwork along a project alignment, allowing the designer to identify the most economical direction and distance to haul excavated material.

Question 5

When grading near existing trees, which practice best protects tree roots from compaction damage?

Accepted Answer

Place 4–6 inches of wood chip mulch over the CRZ and restrict equipment access

Answer

Applying mulch over the critical root zone dissipates equipment pressure, retains moisture, and restricts access — the best practice for protecting roots during grading.

LARE Test Practice Test

LARE Test Practice Test

LARE LARE Grading and Earthwork 3