In California, which soil investigation report is required before construction can begin on a building project in areas with known liquefaction potential?
Correct Answer
D) Geotechnical engineering report with liquefaction analysis
CBC Section 1803.5.12 requires a geotechnical engineering report that includes liquefaction analysis for sites in areas with known liquefaction potential. This comprehensive report must evaluate soil conditions and provide foundation recommendations to mitigate liquefaction risks during seismic events.
Why This Is the Correct Answer
CBC Section 1803.5.12 mandates a full geotechnical engineering report that specifically includes a liquefaction analysis for sites in known liquefaction hazard zones. This report must evaluate subsurface soil conditions and recommend mitigation measures to address the risk of soil strength loss during seismic shaking.
Why the Other Options Are Wrong
Option A: Environmental impact assessment
An environmental impact assessment addresses ecological, air, water, and community impacts — it does not evaluate structural soil behavior such as liquefaction susceptibility.
Option B: Soil density report
A soil density report alone is insufficient. While density data is one input, it does not constitute the comprehensive geotechnical engineering analysis with liquefaction analysis that the CBC requires.
Option C: Standard penetration test report only
A standard penetration test (SPT) report may be one component of a geotechnical investigation, but a standalone SPT report is not the complete geotechnical engineering report with liquefaction analysis required by CBC Section 1803.5.12.
Memory Technique
Liquefaction = soil 'melting' in a quake → you need a GEO-TECH ENGINEER (not just a test or assessment) to analyze the full picture and prescribe fixes.
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