As a guideline for requesting soil reports from GEO Technical firms use the following for your particular tower.

Self Support Towers

Provide one soil boring per site and provide the following information at a minimum.

• Allowable bearing pressure at incremental depths to a depth of 20' for shallow foundation or 60' plus or minus for drilled pier foundations

• Water table below grade

• Soil weight in pounds per Cu. Ft.

• Skin friction values if drilled pier foundations are required

• N values for all samples

• Rock Quality Designation (RQD) if rock foundations are required

• Passive Pressure coefficient for granular soils (KP), (PHI) and cohesion values for clay soils (c)

GUYED TOWERS

Provide four to seven soil borings per site and provide the following information at a minimum.

• Allowable bearing pressure required at base (3' - 6' depth).   All borings should be 15' to 20' deep.   If drilled pier foundations are anticipated, boring depths should be increased to between 30' and 50'

• Water table below grade

• Soil weight in pounds per Cu. Ft.

• Skin friction values if drilled pier foundations are required

• N values for all samples

• Rock Quality Designation (RQD) if rock foundations are required

• Passive Pressure coefficient for granular soils (KP), (PHI) and cohesion values for clay soils (c)