Under NPDES regulations, construction sites disturbing how much area require a stormwater permit?
Correct Answer
B) 1.0 acre or more
The National Pollutant Discharge Elimination System (NPDES) requires stormwater permits for construction activities that disturb 1.0 acre or more of land. This helps protect water quality from construction runoff.
Why This Is the Correct Answer
Under the National Pollutant Discharge Elimination System (NPDES) regulations, construction activities that disturb 1.0 acre or more of land require a stormwater permit. This federal requirement is part of the Clean Water Act and applies to all construction sites meeting this threshold. The 1.0 acre minimum was established to capture most significant construction projects while exempting smaller residential and minor commercial projects. This regulation helps prevent sediment and pollutants from construction runoff from entering waterways.
Why the Other Options Are Wrong
Option A: 0.5 acres or more
0.5 acres is below the federal NPDES threshold, though some local jurisdictions may have stricter requirements at this level
Option C: 1.5 acres or more
1.5 acres exceeds the actual threshold, meaning projects between 1.0-1.5 acres would incorrectly be exempt from permit requirements
Option D: 2.0 acres or more
2.0 acres is too high and would exempt many medium-sized construction projects that should require stormwater permits
Memory Technique
Think 'ONE acre = ONE permit' - the round number 1.0 makes it easy to remember the NPDES threshold
Reference Hint
Look up Environmental Regulations chapter or Water Quality/Stormwater Management sections in your contractor reference manual
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