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When weak near-surface soil cannot support a heavy structure, what foundation may be needed?

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  1. A deep foundation reaching stronger material
  2. A shallower spread footing
  3. A thicker layer of topsoil

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References

  1. FHWA Foundation Engineering Project www.fhwa.dot.gov/publications/research/infrastructure/geotechnical/98139/02.cfm Checked 2026-10-10.

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