4.8.5 Infeasibility Criteria

Consult with the project geotechnical and structural engineers to determine the feasibility of using limited excavation foundations as an LID design solution. Designers should consider the following infeasibility guidance:
  • Minimal excavation foundations generally are not suitable for structures greater than three stories high.
  • Perimeter walls with pins generally should not be used on sites with slopes exceeding 10 percent.
  • Piers generally should not be used on sites with slopes exceeding 30 percent.
  • Minimal excavation foundations should not be used on sites with high organic content or low bearing capacity unless the depth to bearing soils is limited (use is subject to review and evaluation by a geotechnical engineer).
  • Minimal excavation foundations should not be used on fill soils unless the pilings can reach the bearing soils (use is subject to review and evaluation by a geotechnical engineer).


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