1990 Folsom - Tenderloin Neighborhood Development Corp


Key Features 



Geotechnical Challenges


  • Eight-story 100% affordable-housing complex in San Francisco's Mission District, co-developed and owned by Tenderloin Neighborhood Development Corp. and Mission Economic Development Agency 

  • 143 residential units, along with arts-oriented PDR, childcare, urban farming, and outdoor recreational spaces, as well as residential services 

  • Site located in state-required zone of special study and Site Class F

  • Up to 50 feet of liquefiable sand stratigraphy

  • Shallow groundwater table and loose sand fill 

  • Large quantity of ground-improvement elements (1,000+) in very fast-paced schedule


Innovative Solutions


  • Collaboration with Design Team and specialty ground improvement contractor to value engineer and develop a cost-saving ground improvement system accommodating shallow foundations 

  • Robust and efficient production and post-production testing and assessment of ground improvements to confirm design performance was achieved 

  • Proficient coordination with general contractor and foundation contractor to provide client with expedient and prompt Quality Assurance during construction