Which soil group corresponds to LTAR range 0.6 - 0.3 gpd/ft2?

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Multiple Choice

Which soil group corresponds to LTAR range 0.6 - 0.3 gpd/ft2?

LTAR, or long-term absorption rate, is the soil’s average daily capacity to accept and treat wastewater per square foot over the life of the system. It’s measured in gallons per day per square foot (gpd/ft2) and is used to categorize soils into groups that guide drainfield sizing. A range of 0.6 to 0.3 gpd/ft2 sits in the middle of the four groupings, indicating a moderate infiltration capacity. That mid-range aligns with the group characterized by a balanced ability to absorb effluent—not the fastest nor the slowest. So this LTAR matches the middle group. Higher LTAR soils would exceed this range, while lower LTAR soils would fall below, which is why the given range points to the mid-range group.

LTAR, or long-term absorption rate, is the soil’s average daily capacity to accept and treat wastewater per square foot over the life of the system. It’s measured in gallons per day per square foot (gpd/ft2) and is used to categorize soils into groups that guide drainfield sizing. A range of 0.6 to 0.3 gpd/ft2 sits in the middle of the four groupings, indicating a moderate infiltration capacity. That mid-range aligns with the group characterized by a balanced ability to absorb effluent—not the fastest nor the slowest. So this LTAR matches the middle group. Higher LTAR soils would exceed this range, while lower LTAR soils would fall below, which is why the given range points to the mid-range group.

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