Under NC environmental regulations, what is the minimum distance a construction site dewatering discharge must be from a storm drain inlet?
Correct Answer
A) 50 feet
NC environmental regulations require construction dewatering discharge to be at least 50 feet from storm drain inlets to prevent contamination.
Why This Is the Correct Answer
NC environmental regulations require that construction dewatering discharge be located at least 50 feet from storm drain inlets. This buffer distance prevents sediment-laden dewatering water from entering the storm sewer system and ultimately reaching waterways.
Why the Other Options Are Wrong
Option B: 25 feet
25 feet is insufficient. The regulation requires a minimum of 50 feet, which is double this distance, to provide an adequate natural filtration buffer before water can reach a storm drain.
Option C: 100 feet
100 feet exceeds the required minimum. While greater separation is always beneficial from an environmental standpoint, the regulatory minimum is 50 feet, not 100. Choosing 100 feet would impose an unnecessarily restrictive standard beyond what the regulation requires.
Option D: 75 feet
75 feet is also not the correct regulatory minimum. This distance is between the actual requirement (50 feet) and the exaggerated option (100 feet), designed to test whether candidates know the precise regulatory figure.
Memory Technique
Remember '50 feet = half a football field.' Picture a dewatering pump set up half a football field away from the nearest storm drain — that is the NC environmental minimum.
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