During construction, you discover that the actual soil conditions differ significantly from those described in the geotechnical report. What is the appropriate next step?
Correct Answer
B) Stop work and have the geotechnical engineer re-evaluate
Unexpected soil conditions require immediate re-evaluation by the geotechnical engineer to determine if design changes are necessary for safety and code compliance.
Why This Is the Correct Answer
Encountering soil conditions that differ materially from those in the geotechnical report is a classic 'differing site condition' — a formal contract and legal concept (addressed in AIA contracts, FAR clauses, and California Public Contract Code). The required response is to stop work in the affected area and immediately notify the geotechnical engineer for re-evaluation. This protects the contractor legally (preserves differing-site-condition claim rights), ensures the foundation design is revised if necessary, and prevents structural failures that could result from proceeding with a design based on incorrect soil assumptions.
Why the Other Options Are Wrong
Option A: Increase the foundation size by 20% as a safety factor
Arbitrarily increasing foundation size by 20% without engineering analysis is not a recognized or defensible approach. The actual required modification depends on the specific conditions encountered and must be determined by a licensed geotechnical engineer — not an arbitrary percentage selected by the field crew.
Option C: Make field adjustments based on your experience
Making field adjustments based on personal experience without professional re-evaluation is a serious liability risk and likely a code violation. Foundation design must be performed by or under the supervision of a licensed engineer, not improvised in the field.
Option D: Continue with the original foundation design
Continuing with the original foundation design when the underlying soil assumptions are invalid could result in structural inadequacy, failure, or collapse. The design is only valid for the conditions assumed in the geotechnical report.
Memory Technique
Differing site condition = STOP, NOTIFY, EVALUATE. Three words to remember: Stop work, Notify the geotechnical engineer (and owner/architect), Evaluate before proceeding. This sequence also preserves your contractual right to a change order for the additional cost and time.
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