A project requires 500 cubic yards of concrete to be poured. If the stormwater permit requires sediment barriers every 100 linear feet and the perimeter is 800 feet, how many barriers are needed?
Correct Answer
C) 8 barriers
With an 800-foot perimeter and barriers required every 100 feet, you need 800 ÷ 100 = 8 barriers. Proper placement of sediment barriers is crucial for NPDES permit compliance.
Why This Is the Correct Answer
The calculation is straightforward division: 800-foot perimeter ÷ 100 feet per barrier = 8 barriers. This ensures complete perimeter coverage as required by NPDES stormwater permits. The 500 cubic yards of concrete mentioned is irrelevant to the barrier calculation, which is based solely on linear perimeter distance. Proper sediment barrier spacing is critical for erosion control and permit compliance.
Why the Other Options Are Wrong
Option A: 6 barriers
6 barriers would only cover 600 feet (6 × 100), leaving 200 feet of perimeter unprotected, which violates permit requirements.
Option B: 7 barriers
7 barriers would only cover 700 feet (7 × 100), leaving 100 feet of perimeter without required protection.
Option D: 9 barriers
9 barriers would provide more coverage than required (900 feet vs 800 feet needed), resulting in unnecessary expense and over-compliance.
Memory Technique
Remember 'Perimeter Divided by Distance' (PDD) - always divide the total perimeter by the required spacing distance for barrier calculations.
Reference Hint
Florida Building Code Chapter 33 - Site Work and Environmental Protection, or FDEP Stormwater Management guidelines
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