Runoff has cut under a silt fence after a storm. What maintenance is needed?
Correct Answer
A) Rekey or repair the fence, remove sediment as required, and restore grade around it.
Undermined silt fence no longer controls sheet flow and needs repair.
Why This Is the Correct Answer
Undermined silt fence no longer controls sheet flow and needs repair.
Why the Other Options Are Wrong
Option B: Add more water upstream
In site construction, Add more water upstream. is the wrong selection for Silt fence undermined: the choice would not get the project to Rekey or repair the fence, remove sediment as required, and restore grade around it.
Option C: The site crew should leave the gap for drainage
The trap in C is Leave the gap for drainage. That selection is wrong because the option does not produce the required Silt fence undermined outcome, Rekey or repair the fence, remove sediment as required, and restore grade around it.
Option D: The site crew should move spoil onto the fence, leaving silt fence undermined unverified
Choice D gives Move spoil onto the fence. Its specific error: it points to Move spoil onto the fence. but.
Memory Technique
Tag the scene with silt fence undermined: wrong actor or wrong timing means the fix is not Rekey or repair the fence, remove sediment as required, and restore grade around it.
Reference Hint
Open Developing Your Stormwater Pollution Prevention Plan, EPA 833-R-06-004, 2007; use the index entry or section for "EPA 833-R-06-004 - SWPPP development / permit and inspection topics" to confirm that Undermined silt fence no longer controls sheet flow and needs repair.
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