A construction site must implement erosion control measures under an NPDES permit. The site is 3 acres with a slope of 15%. What is the minimum inspection frequency required during active construction?
Correct Answer
D) Bi-weekly
Under the NPDES Construction General Permit, sites must be inspected at least once every 14 calendar days (bi-weekly) and within 24 hours of any storm event of 0.5 inches or greater. Regular inspections ensure erosion control measures remain effective.
Why This Is the Correct Answer
CORRECT_ANSWER - The NPDES Construction General Permit specifically requires inspections at least once every 14 calendar days (bi-weekly) during active construction phases. This frequency ensures that erosion and sediment control measures are functioning properly and can be adjusted if needed. The bi-weekly requirement applies regardless of site size or slope, though steeper slopes like this 15% grade may require more vigilant monitoring between required inspections.
Why the Other Options Are Wrong
Option A: Daily
Daily inspections are not required under the NPDES permit and would be unnecessarily frequent and costly for most construction sites. While daily monitoring might be prudent for high-risk areas, it exceeds the minimum regulatory requirement.
Option B: Monthly
Weekly inspections, while more frequent than required, do not meet the specific 14-calendar-day requirement established in the NPDES Construction General Permit. The regulation specifically states 'at least once every 14 calendar days,' not weekly.
Option C: Weekly
Why option C is wrong (or 'CORRECT_ANSWER' if C is correct)
Memory Technique
Think 'Two weeks, Two inspections per month' - the bi-weekly requirement means roughly twice monthly, which helps distinguish it from weekly or monthly options.
Reference Hint
Florida Building Code, Chapter 1, Administrative provisions, or EPA NPDES Construction General Permit documentation - look for stormwater management and erosion control requirements
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