A construction project will disturb 0.75 acres but connects to an existing storm sewer system that drains to waters of the United States. Is an NPDES permit required?
Correct Answer
A) No, because the project is under 1 acre
NPDES stormwater permits are required for construction activities disturbing one acre or more. At 0.75 acres, this project falls below the threshold regardless of the connection to waters of the United States.
Why This Is the Correct Answer
The NPDES (National Pollutant Discharge Elimination System) Construction General Permit has a clear threshold of one acre or more of disturbed area. Since this project only disturbs 0.75 acres, it falls below the federal requirement threshold. The connection to waters of the United States is irrelevant when the project size is below the one-acre trigger. Federal regulations under the Clean Water Act establish this bright-line rule for construction stormwater permits.
Why the Other Options Are Wrong
Option B: No, because it uses existing infrastructure
Using existing infrastructure does not exempt a project from NPDES requirements if other criteria are met. The key factor is the acreage of soil disturbance, not whether new or existing stormwater infrastructure is used.
Option D: Yes, because it connects to waters of the United States
While connection to waters of the United States is relevant for many environmental permits, it does not override the specific one-acre threshold for NPDES construction stormwater permits. The size of the disturbed area is the primary determining factor, not the downstream connection.
Memory Technique
Think 'ONE and DONE' - One acre is the threshold, and if you're under one acre, you're done (no NPDES permit needed).
Reference Hint
Florida Building Code, Chapter 1, Administrative provisions, or Environmental regulations section covering stormwater management and NPDES permits
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