A construction project disturbs 2.5 acres of land. The contractor must obtain an NPDES stormwater permit because the project exceeds which threshold?
Correct Answer
A) 1.0 acre
NPDES stormwater permits are required for construction activities that disturb one acre or more of land. This project at 2.5 acres clearly exceeds the 1.0 acre threshold requiring permit coverage.
Why This Is the Correct Answer
The National Pollutant Discharge Elimination System (NPDES) Construction General Permit requires coverage for construction activities that disturb one acre or more of land. This is a federal requirement under the Clean Water Act that applies nationwide. Since the project disturbs 2.5 acres, it clearly exceeds the 1.0 acre threshold and requires NPDES permit coverage. This threshold is specifically designed to regulate larger construction projects that have greater potential for stormwater pollution.
Why the Other Options Are Wrong
Option B: 3.0 acres
3.0 acres is significantly above the actual threshold. This would exempt too many construction projects from important stormwater pollution controls required under federal environmental law.
Option C: 2.0 acres
0.5 acres is below the federal NPDES threshold requirement. While some local jurisdictions may have stricter requirements, the federal NPDES Construction General Permit specifically requires coverage at 1.0 acre or more.
Memory Technique
Think 'NPDES = 1 ACRE NEEDS' - the acronym reminds you that NPDES permits are NEEDED when you reach 1 ACRE of disturbance
Reference Hint
Look up Environmental Regulations chapter or Water Quality/Stormwater Management sections in your contractor reference manual for NPDES permit requirements
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