A site plan shows existing grade at elevation 102.5' and proposed grade at elevation 104.2'. What is the amount of fill required at this location?
Correct Answer
C) 1.7 feet of fill
The fill required is calculated by subtracting existing grade from proposed grade: 104.2' - 102.5' = 1.7'. Since the result is positive, this indicates 1.7 feet of fill is needed to raise the grade.
Why This Is the Correct Answer
To determine fill requirements, you subtract the existing grade elevation from the proposed grade elevation. When the proposed grade (104.2') is higher than the existing grade (102.5'), the positive result indicates fill is needed. The calculation 104.2' - 102.5' = 1.7' shows exactly how much fill material must be added to raise the ground to the desired elevation.
Why the Other Options Are Wrong
Option A: 206.7 feet total elevation
This incorrectly adds the two elevations together (102.5' + 104.2' = 206.7'), which has no meaning in grading calculations. We need the difference between elevations, not their sum.
Option D: 1.7 feet of cut
This is incorrect because cut refers to removing soil when the proposed grade is lower than existing grade. Since 104.2' is higher than 102.5', we need to add material (fill), not remove it (cut).
Memory Technique
Think 'P-E=F/C' (Proposed minus Existing equals Fill or Cut). Positive result = Fill up, Negative result = Cut down.
Reference Hint
Look up site work and grading sections in construction reference materials, typically found in earthwork or site preparation chapters
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