https://www.intertek.com/building/subsurface-investigations/
Subsurface Investigations & Exploration
Intertek's PSI Geotechnical Engineers provide Subsurface Investigations and Exploration to evaluate a site's geological conditions for potential risk
subsurface investigationsexploration
https://www.nrc.gov/docs/ML2317/ML23177A006.html
NRC: Package ML23177A006 -Interim Staff Guidance on Subsurface Investigations, Phase 1
staff guidancesubsurface investigationsnrcpackageinterim