A contractor is working on a project that will disturb 0.8 acres of land but is part of a larger common plan of development totaling 2.5 acres. What NPDES requirement applies?
Correct Answer
B) Construction General Permit required due to larger common plan
NPDES regulations consider the total area of the common plan of development, not just individual phases. Since the common plan exceeds 1 acre, a Construction General Permit is required even though this phase is under 1 acre.
Why This Is the Correct Answer
Under NPDES regulations, the Construction General Permit requirement is triggered when the total disturbed area of a common plan of development equals or exceeds 1 acre. The regulation looks at the cumulative impact of the entire development project, not individual phases or portions. Since the common plan totals 2.5 acres, it exceeds the 1-acre threshold, making the Construction General Permit mandatory for all phases of the project, even those disturbing less than 1 acre individually.
Why the Other Options Are Wrong
Option A: No permit required since individual project is under 1 acre
This is incorrect because NPDES regulations don't evaluate individual project phases in isolation. The 1-acre threshold applies to the total common plan of development, not individual phases. Even though this specific phase disturbs only 0.8 acres, it's part of a larger 2.5-acre plan that triggers permit requirements.
Option C: Individual NPDES permit required
An Individual NPDES permit is typically required for larger, more complex projects or when the Construction General Permit doesn't provide adequate coverage. For a 2.5-acre common plan, the Construction General Permit is the appropriate level of coverage, not the more stringent Individual permit.
Option D: State permit only, no federal requirement
This is incorrect because NPDES is a federal program under the Clean Water Act. While states may have additional requirements, the federal NPDES Construction General Permit is still required when the common plan exceeds 1 acre, regardless of state-only permits.
Memory Technique
Remember 'COMMON = COMBINED' - when you see common plan of development, always add up ALL the acreage to determine if it exceeds the 1-acre NPDES threshold.
Reference Hint
Environmental regulations chapter, specifically NPDES Construction General Permit requirements and common plan of development definitions
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