2.1 Minumum seasonal depth to water table
2.2 Soil media physical integrity
2.2.1 Is the dominant material between the surface and the top of the water table?
2.2.2 Are there obvious or any known preferential flow paths in the soils above
the water table?
2.3 Aquifer media, hydraulic properties
2.3.1 Is the dominant material in the uppermost underlying aquifer
2.3.2 Are there any obvious or known preferential flow paths in the aquifer
through trenches, permeable faults, wells, foundations, excavations, which are
likely to provide continuous or near continuous flowpaths to a receiving surface
2.4 Impact of the vadose zone
Which of the soil-types listed here best or most nearly describes the chemical absorption properties of the subsoil
in the vadose zone under the site? Keep in mind that generally chemical absorption by a soil is most affected by
particle size, organic matter and clay content. Choose the most absorbent material
present which is > 10% of the total.
2.5 Aquifer materials
Which soil type would approximate the chemical absorption properties of the aquifer materials
between the site and any surface receiving water? The chemical absorption
by a material is most affected by particle size and clay content. If the
materials are variable, choose the one most likely to be the finest-grained or
the one with the highest organic or clay content.