The slope is an important factor in determining the best location for a drainage field.
The excavation depth is typically >5 feet, however if some restrictive layer is present the depth may be more shallow.
The parent material is the geologic material from which soil horizons form.
Horizons are distinct layers of the soil, which may have differing chemical and physical properties.
The Munsell color is determined by classifying via its hue, value, and chroma.
Redoximorphic features are characteristic soil patterns caused by reduction, translocation, and oxidation occurring within the soil. These may be indicative of inadequate drainage.
The texture is determined by it's proportions of sand, silt, and clay within the soil.
The presence of rocks and gravel are noted, as well as their concentration.
The consistence is the soil's resistance to deformation or rupture.
The structure of a soil is the arrangement of the soil particles. This is an important factor when it comes to water's ability to freely move.
The presence of roots and pores can help indicate whether a soil will have adequate drainage.
High shrink/swell clay is a big problem for OWTS in some cases. This type of clay can heavily restrict water movement to subsequent horizons.
The soil groups are categories that particular soil classes have been assigned. They generally have similar physical properties when it comes to their interaction with water
The data accumulated is used to formulate the rate at which the soil will likely to accept effluent from an OWTS.
This is generally given in terms or gallons per day per square-foot or (GPD/ft²).
Additional considerations or suggestions may be conveyed in this section. If a soil has an unsuitable texture, an advanced system may be mentioned here.