Construction activities begin at 6:00 AM and the site is 1.8 acres. The NPDES permit requires daily inspections. If inspections take 30 minutes and must be completed before 8:00 AM, what is the latest time inspections can begin?
Correct Answer
C) 7:30 AM
If inspections must be completed by 8:00 AM and take 30 minutes, they must begin no later than 7:30 AM. Daily inspections are required for sites over one acre under NPDES permits.
Why This Is the Correct Answer
This is a simple time calculation problem. If the inspection must be completed by 8:00 AM and takes 30 minutes to perform, then working backwards from the deadline gives us the latest start time. 8:00 AM minus 30 minutes equals 7:30 AM as the latest possible start time to meet the requirement.
Why the Other Options Are Wrong
Option A: 7:00 AM
7:00 AM would allow 60 minutes for the inspection, which is 30 minutes more than needed. While this would meet the requirement, it's not the latest possible start time.
Option B: 7:15 AM
7:15 AM would allow 45 minutes for the inspection, which is 15 minutes more than the required 30 minutes. This would work but is not the latest possible start time.
Option D: 7:45 AM
7:45 AM would only allow 15 minutes for the inspection, which is insufficient since the inspection requires 30 minutes to complete properly.
Memory Technique
Remember 'Deadline minus Duration equals latest Start time' - use the formula D - D = S for time management problems
Reference Hint
Environmental regulations chapter covering NPDES permit requirements and stormwater management compliance
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