Section 906.30 — Soil and Site Requirements
Incorrect. The correct answer is highlighed in green below.
During mound construction, for shallow permeable soils over pervious bedrock, the percolation test shall be run at:
a depth of 12-18 in. below the natural surface.
a depth of 20-24 in. below the natural surface
a depth as determined by the proximity to underground fractured limestone or comparable material