Study for the North Carolina Septic Inspector Exam. Use detailed flashcards and multiple choice questions with hints and explanations. Get exam-ready today!

Multiple Choice

Within 36 inches of the surface, prismatic structure is considered what with respect to structure?

In septic suitability, the uppermost soil layer’s ability to infiltrate and drain is crucial. Prismatic structure within 36 inches of the surface signals a more restrictive horizon with less pore connectivity, which slows or blocks effluent infiltration and can cause perched water. That makes the soil unreliable for a conventional leach field, so it’s considered unsuitable for standard septic use.

In septic suitability, the uppermost soil layer’s ability to infiltrate and drain is crucial. Prismatic structure within 36 inches of the surface signals a more restrictive horizon with less pore connectivity, which slows or blocks effluent infiltration and can cause perched water. That makes the soil unreliable for a conventional leach field, so it’s considered unsuitable for standard septic use.