A site plan shows an existing grade of 102.5' and a proposed grade of 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 of fill needed is 104.0' - 102.5' = 1.5 feet.
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 required. The term 'fill' specifically refers to adding material to raise the elevation.
Why the Other Options Are Wrong
Option B: 2.5 feet of fill
This option incorrectly identifies the operation as 'cut' when it should be 'fill'. Cut refers to removing earth when the proposed grade is lower than existing grade, but here the proposed grade is higher.
Option C: 6.5 feet of fill
This option shows a completely incorrect calculation. The difference between 104.0' and 102.5' is 1.5 feet, not 6.5 feet. This may result from adding instead of subtracting the elevations.
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
Look up 'Site Work and Grading' or 'Earthwork' sections in construction reference materials, typically found in site preparation chapters
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