You are reviewing a site plan that shows existing elevations and proposed elevations. The existing grade at the building corner is 102.5 feet, and the proposed grade is 104.2 feet. How much fill is required at this location?
Correct Answer
D) 1.7 feet
Fill is calculated by subtracting existing elevation from proposed elevation: 104.2 - 102.5 = 1.7 feet of fill required. When the proposed elevation is higher than existing, fill is needed.
Why This Is the Correct Answer
Fill calculation is a straightforward subtraction where you subtract the existing elevation from the proposed elevation. Since the proposed grade (104.2 feet) is higher than the existing grade (102.5 feet), fill material must be added to raise the ground level. The calculation 104.2 - 102.5 = 1.7 feet gives the exact amount of fill needed at this location. This is a fundamental site work calculation that contractors must understand for proper grading and earthwork planning.
Why the Other Options Are Wrong
Option B: 1.2 feet
This answer of 6.7 feet is completely incorrect and suggests a fundamental misunderstanding of the calculation, possibly adding the two elevations together instead of finding their difference.
Option C: 6.7 feet
This answer of 2.3 feet is incorrect and likely results from adding the decimal portions (0.5 + 0.2 = 0.7) to an incorrect base calculation, or from misreading the elevation values entirely.
Memory Technique
Use 'FILL UP' - when the proposed elevation goes UP from existing, you FILL. The formula is always Proposed minus Existing for fill calculations.
Reference Hint
Look up site work and grading calculations in the construction management or site preparation chapters of your reference materials, typically found under earthwork or excavation sections.
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