Under Hawaii's Clean Water Act requirements, construction projects disturbing more than how many acres must obtain NPDES stormwater permits?
Correct Answer
D) 1 acre
Federal and Hawaii state regulations require NPDES (National Pollutant Discharge Elimination System) stormwater permits for construction activities that disturb 1 acre or more of land.
Why This Is the Correct Answer
Option D (1 acre) is correct. Under the federal Clean Water Act's Phase II Stormwater Rules, which Hawaii has adopted, construction activities that disturb 1 acre or more of land — or less than 1 acre if part of a larger common plan of development — must obtain NPDES (National Pollutant Discharge Elimination System) stormwater permits and implement a Stormwater Pollution Prevention Plan (SWPPP).
Why the Other Options Are Wrong
Option A: 5 acres
5 acres was the original Phase I threshold (1990) that applied only to the largest sites. After Phase II rules took effect in 2003, the threshold was lowered to 1 acre to capture far more construction sites. Using the old 5-acre threshold is a common outdated error.
Option B: 2 acres
2 acres has never been a regulatory threshold under either Phase I or Phase II stormwater rules. This is a distractor value with no basis in the Clean Water Act regulatory framework.
Option C: 0.5 acres
0.5 acres (half an acre) is below the 1-acre threshold. Projects under 1 acre can still require permits if they are part of a larger common plan of development, but 0.5 acres by itself is not the standalone trigger.
Memory Technique
One acre = one permit. The rule is easy to remember: disturb 1 or more acres of land on a construction site, and you need an NPDES stormwater permit. Visualize a football field (approximately 1 acre) — clear that much ground and the permit clock starts.
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