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

Which soil group corresponds to LTAR range 0.4 - 0.1 gpd/ft2?

Long-Term Infiltration Rate shows how quickly a soil can absorb wastewater over time. It’s measured in gallons per day per square foot, and lower values mean slower, poorer absorption. Soils are grouped by LTAR, with the lowest absorption placed in the most restrictive group. The range 0.1 to 0.4 gpd/ft2 represents very slow absorption, which corresponds to the most restrictive soil group. That’s why this range fits Soil Group IV. In contrast, higher LTAR values indicate faster absorption and fit into the other groups.

Long-Term Infiltration Rate shows how quickly a soil can absorb wastewater over time. It’s measured in gallons per day per square foot, and lower values mean slower, poorer absorption. Soils are grouped by LTAR, with the lowest absorption placed in the most restrictive group. The range 0.1 to 0.4 gpd/ft2 represents very slow absorption, which corresponds to the most restrictive soil group. That’s why this range fits Soil Group IV. In contrast, higher LTAR values indicate faster absorption and fit into the other groups.