LARE LARE Grading and Earthwork 2

Question 1

The average end area method is used to calculate earthwork volumes. If Station 0+00 has an end area of 120 sq ft and Station 1+00 has an end area of 200 sq ft, what is the volume in cubic yards?

Accepted Answer

593 CY

Answer

Volume = ((120 + 200) / 2) × 100 ft = 16,000 cu ft ÷ 27 = 592.6, approximately 593 CY.

Question 2

When reading a grading plan, a contour line that forms a 'V' shape pointing uphill indicates which topographic feature?

Accepted Answer

A valley or swale

Answer

Contour V-shapes pointing uphill indicate a valley, drainage swale, or stream channel where water flows.

Question 3

A landscape architect must grade a parking lot so it drains properly. What is the minimum recommended slope for paved surfaces to ensure positive drainage?

Accepted Answer

0.25%

Answer

A minimum slope of 0.25% (1/4 of 1%) is generally accepted for paved surfaces to achieve positive drainage.

Question 4

Which of the following soil classifications has the greatest swell factor when excavated, requiring the most adjustment in earthwork calculations?

Accepted Answer

Rock

Answer

Rock has the highest swell factor (up to 30–40%) because blasting and fracturing dramatically increases its volume compared to in-place conditions.

Question 5

On a grading plan, a designer places a spot elevation of 102.5 at a low point in a parking lot. The nearest catch basin rim elevation is 102.0. This condition will result in:

Accepted Answer

Ponding water at the low point

Answer

If the low point spot elevation (102.5) is higher than the catch basin rim (102.0), water cannot flow into the basin and will pond at the low point.

LARE Test Practice Test

LARE Test Practice Test

LARE LARE Grading and Earthwork 2