A construction site will disturb 0.8 acres but is part of a larger development that will ultimately disturb 3.2 acres. What NPDES requirement applies to this phase?
Correct Answer
B) NOI required based on total planned disturbance
NPDES regulations require permits based on total planned disturbance for the entire project, not individual phases. Since the total development will disturb over 1 acre, an NOI is required even for phases under 1 acre.
Why This Is the Correct Answer
NPDES stormwater regulations evaluate permit requirements based on the total planned disturbance for the entire common plan of development or sale, not individual construction phases. Since the overall project will disturb 3.2 acres (exceeding the 1-acre threshold), a Notice of Intent (NOI) for coverage under the Construction General Permit is required for all phases of the project. This prevents developers from circumventing permit requirements by artificially breaking projects into smaller phases that individually fall below the 1-acre threshold.
Why the Other Options Are Wrong
Option A: Local permit only
While local permits may also be required, NPDES is a federal program administered by EPA or authorized states. Federal stormwater requirements cannot be satisfied by local permits alone when the project exceeds the 1-acre threshold for total disturbance.
Option C: No permit required since this phase is under 1 acre
An individual NPDES permit is typically required for major industrial dischargers or complex projects that cannot be adequately covered by general permits. For standard construction stormwater runoff from a 3.2-acre development, the Construction General Permit with NOI coverage is the appropriate regulatory pathway.
Option D: Individual permit required
This option incorrectly focuses only on the individual phase disturbance (0.8 acres) rather than the total project disturbance. NPDES regulations specifically look at the cumulative impact of the entire development plan, making this interpretation a violation of federal stormwater requirements.
Memory Technique
Remember 'TOTAL TROUBLE' - if the TOTAL project disturbance exceeds 1 acre, you're in regulatory TROUBLE and need NPDES permits for all phases
Reference Hint
Florida Building Code Chapter 15 - Referenced Standards, or EPA NPDES Construction General Permit fact sheets
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