Soil Classification Tests | |||
Group No. | Liquid Limit | Plasticity Index | Typical Material Description |
I | <35 | 5-15 | Limestone, weathered limestone, or severely weathered limestone |
II | 30-40 | 10-25 | Sandy clays, silty clays, or severely weathered limestone |
III | 40-50 | 15-30 | Sandy clays, silty clays, or severely weathered limestone |
IV | 50-60 | 20-35 | Clay or silty clay |
V | 60-70 | 25-40 | Clay |
VI | 70-80 | 35-50 | Clay |
VII | >80 | 40-60 | Clay |
NOTE: Graphical representation of these subgrade groups are shown on Table II. Values which plot on the borderline between two groups should be assigned the group number of the poorer soil group. Soils which have less than 40% passing the Number 200 mesh sieve and which would plot in Groups III through VII may be upgraded to the next better group.
(Ord. 93-06, passed 4-22-93)