Under NC environmental regulations, what is the maximum allowable slope for temporary stockpiles of soil?
Correct Answer
B) 3:1 (horizontal to vertical)
NC environmental regulations specify a maximum slope of 3:1 (horizontal to vertical) for temporary soil stockpiles to prevent erosion.
Why This Is the Correct Answer
NC Sedimentation Pollution Control Act regulations specify a maximum 3:1 (horizontal to vertical) slope for temporary soil stockpiles. This ratio ensures the pile is stable enough to resist erosion and slumping while limiting the footprint of the stockpile on the site.
Why the Other Options Are Wrong
Option A: 2:1 (horizontal to vertical)
Incorrect. A 2:1 slope is steeper than permitted for temporary stockpiles. Steeper slopes increase erosion risk and instability. NC requires the more gradual 3:1 ratio to reduce sediment runoff.
Option C: 4:1 (horizontal to vertical)
Incorrect. While a 4:1 slope would be even flatter and more stable than required, it is not the code maximum — it would unnecessarily increase the land area consumed by the stockpile. The regulation sets 3:1 as the maximum (steepest allowed).
Option D: 1.5:1 (horizontal to vertical)
Incorrect. A 1.5:1 slope is steeper than the 2:1 option and far steeper than the allowed maximum. Such a slope would create significant erosion and instability hazards for temporary soil stockpiles.
Memory Technique
Remember '3 to 1 — stockpile done right.' The 3 is always horizontal in erosion control ratios. Flatter = safer = 3:1 for stockpiles. Think of a gentle hill (3:1) vs. a steep cliff (1.5:1).
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