A site plan shows existing grade at elevation 102.5' and proposed grade at elevation 104.0' at a specific location. How much fill is required at this point?
Correct Answer
D) 1.5 feet of fill
Since the proposed grade (104.0') is higher than the existing grade (102.5'), fill is required. The amount is 104.0' - 102.5' = 1.5 feet of fill.
Why This Is the Correct Answer
When the proposed grade elevation is higher than the existing grade elevation, fill material must be added to raise the ground level. The calculation is straightforward: subtract the existing grade from the proposed grade (104.0' - 102.5' = 1.5'). Since the result is positive and the proposed grade is higher, this represents 1.5 feet of fill material needed. This is a fundamental concept in site grading and earthwork calculations.
Why the Other Options Are Wrong
Option B: 1.5 feet of cut
This option uses an incorrect calculation, possibly adding the elevations (102.5' + 104.0' = 206.5') and somehow arriving at 2.5', or making another mathematical error instead of properly subtracting existing from proposed grade.
Option C: 6.5 feet of fill
This option incorrectly identifies the operation as 'cut' when fill is required. Cut would only occur if the proposed grade were lower than the existing grade, requiring soil removal rather than addition.
Memory Technique
Use 'FILL UP, CUT DOWN' - if the proposed grade goes UP from existing, you need to FILL. If it goes DOWN, you need to CUT.
Reference Hint
Site work and grading sections in construction reference materials, typically found in earthwork or site preparation chapters
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