A site plan shows existing grade at elevation 102.5' and proposed grade at elevation 105.0' at a specific point. How much fill is required at this location?
Correct Answer
D) 2.5 feet of fill
Since the proposed grade (105.0') is higher than the existing grade (102.5'), fill material is needed. The difference of 2.5 feet represents the amount of fill required to raise the grade to the proposed elevation.
Why This Is the Correct Answer
Option B is correct because when the proposed grade elevation (105.0') is higher than the existing grade elevation (102.5'), fill material must be added to raise the ground level. The calculation is straightforward: 105.0' - 102.5' = 2.5 feet of fill required. This is a fundamental grading concept where fill raises elevation and cut lowers elevation.
Why the Other Options Are Wrong
Option A: 207.5 feet of fill
Option A incorrectly identifies this as cut when it should be fill. Cut would only occur if the proposed grade was lower than the existing grade, requiring soil removal rather than addition.
Option B: 2.5 feet of cut
Option D of 207.5 feet appears to be adding the elevations together (102.5' + 105.0' = 207.5'), which is completely incorrect for determining cut or fill quantities.
Memory Technique
Use 'FILL goes UP, CUT goes DOWN' - if the proposed elevation number is bigger than existing, you need to FILL UP to reach it.
Reference Hint
Look up site work and grading sections in construction references, typically found in earthwork or site preparation chapters of construction handbooks.
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