Our assessment of the existing structures included the following:
Interior inspection to document existing damage
Settlement monitoring over time
Subsurface exploration to identify existing soil and groundwater conditions
Foundation testing, including load testing, extracting cores for microscopic examination, and manual and mechanical probing to assess the condition of the untreated timber piles
We determined the damage was caused by building settlement as a result of deterioration at the top of some timber piles. The deterioration was attributed to fungal and soft rot attack caused by continued lowering of the local groundwater level. We provided structural and geotechnical design services and developed a comprehensive repair that, where necessary, re-supported the framing on new steel columns, new concrete grade beams, and new permanent steel cased and grouted micropiles. We led a team of sub-consultants that developed a groundwater recharge system to maintain the local groundwater level to arrest the pile deterioration and mitigate damage to the existing salvageable wood piles. Our repair design allowed for continuous occupancy of the building during the work.