At approximately what depth would you expect to find very stiff gray sandy clay?

Very stiff gray sandy clay is typically associated with deeper soil layers that have undergone significant consolidation and compaction processes. Such materials are often found at depths where the geological conditions and overburden pressure have allowed clay particles to become densely packed and the soil to gain strength.

In many soil profiles, the upper layers may consist of softer, more disturbed soils, often influenced by surface conditions, weathering, or human activity. As you progress deeper into the ground, the soil layers generally transition to more stable, cohesive materials.

Given that very stiff gray sandy clay represents a more consolidated type of soil, it is reasonable to expect it to be located at a depth of 15 ft to 19 ft. This depth range typically reflects the transition zone where weathered or disturbed soils change to more compacted and cohesive materials below them.

Therefore, selecting this depth aligns with geological principles regarding soil stratigraphy and the characteristics of clay deposits commonly found within that depth range.