Perform slope stability analyses under all applicable conditions using Limit Equilibrium software such as GSTABL, Slide2, etc. At a minimum, evaluate the following conditions:

1) Short-term (undrained) condition,

2) Long-term (drained) condition, and

3) Rapid drawdown (flood) condition.

For embankments and cut slopes consisting of high plastic clay soil, shear strength may degrade due to exposure to weathering action (shrinkage-swelling). Perform long term stability check based on residual shear strength of the soil.

Specific site conditions may require evaluation for additional types of failure, such as bearing capacity, settlement, and undercutting (for rock cuts).

Perform embankment settlement analysis under service limit state to evaluate the performance of the embankment or structure on top of embankment. If deformation will adversely affect the facility, develop ground improvement or mitigation measures. Identify the most appropriate ground improvement method based on project needs and approval from the department. Include ground improvement limits, details, instrumentation and performance requirement in the plan and specification.