77 Ill. Adm. Code 870.TABLE A
A Soil Pressure
Section 870.TABLE AÂ Â Soil Pressure
Soil Type
Allowable Pressure
(lbs/sq. ft.)
Hard Pan or Rock
4,000 and up
Gravel or Sandy Gravel
2,000
Sandy or Silty Sand
1,500
Clay or Silty Clay
1,000
Peat or Uncompacted Fill
Special Analysis
Required