A site plan shows existing grade at 100.0' and proposed grade at 102.5' at a specific location. What is the amount of fill required at this point?
Correct Answer
B) 2.5 feet of fill
When the proposed grade (102.5') is higher than the existing grade (100.0'), fill material is required. The difference of 2.5 feet indicates the depth of fill needed at that point.
Why This Is the Correct Answer
When the proposed grade elevation (102.5') is higher than the existing grade elevation (100.0'), this indicates that material must be added to raise the ground level. The difference between these elevations (102.5' - 100.0' = 2.5') represents the vertical depth of fill material required at that specific point. This is a fundamental concept in grading and earthwork calculations.
Why the Other Options Are Wrong
Option A: 2.5 feet of cut
This is incorrect because 'cut' refers to removing material when the proposed grade is lower than existing grade. Since the proposed grade is higher, material needs to be added (fill), not removed (cut).
Option C: 102.5 cubic yards of fill
This is incorrect because the question asks for the amount of fill at a specific point, which is measured in linear feet of depth. Additionally, cubic yards would require area measurements, and 102.5 cubic yards is simply using the elevation number with wrong units.
Option D: Cannot be determined from this information
This is incorrect because we have sufficient information to determine the fill depth. The difference between proposed and existing grades at a point directly gives us the fill depth required at that location.
Memory Technique
Use 'FILL UP, CUT DOWN' - when proposed grade goes UP from existing, you FILL. When proposed grade goes DOWN from existing, you CUT.
Reference Hint
Look up 'Site Work and Grading' or 'Earthwork Calculations' in construction reference materials, typically found in site development or civil engineering sections.
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