Which class of soil is classified as "sandy" and is suitable for a standard absorptive drainfield?

The class of soil classified as "sandy" and considered suitable for a standard absorptive drainfield is Class 1b. This classification indicates that the soil has favorable physical properties, allowing for adequate drainage and absorption of effluent from the on-site sewage facility. Sandy soils have larger particle sizes, which promote higher permeability. This characteristic enables the effluent to percolate through the soil effectively, thus reducing the risk of ponding and promoting efficient treatment of waste.

In terms of soil classifications, Class 1b represents soil that is well-drained and has a high absorption capacity, making it ideal for using as a drainfield. Other classes may have either finer particles or higher clay content, which can lead to poor drainage and decreased efficacy of absorption systems, rendering them less effective for standard drainfield applications.