"the thickness and of soil are key factors in determining site suitability for a septic system."

The key factors are the thickness and the type of the soil.

What should be done is the study of the stratigraphic sections of the receiving ground (profile and thickness of the different soil layers of the natural terrain, rock profile and average maximum groundwater level, soil types: texture, structure, density, color, presence traces of oxidation-reduction, associated level of permeability, presence of organic matter, etc.).

The report should describe the classification system used to describe soils.

answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]

other information encoded in your genes might distinguish you from the others in the group