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1803.5.11 Seismic Design Categories C Through F
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For structures assigned to Seismic Design Category C, D, E or F, a geotechnical investigation shall be conducted, and shall include an evaluation of all of the following potential geologic and seismic hazards:
- Slope instability.
- Total and differential settlement.
- Surface displacement due to faulting or seismically induced lateral spreading or lateral flow.