Field data.—As a basis for outlining or designing a suitable installation the following data should be known:
1. State, town, and whether in or near an incorporated municipality.
2. Usual number of persons to be served.
3. Average daily consumption of water in gallons.
4. Kind and depth of well, depth to water surface.
5. Character of soil, whether sandy, gravelly, loamy, clay, or muck.
6. Condition of soil as to drainage.
7. Character of subsoil.
8. Character of underlying rock and, if known, its depth below the surface.