During excavation for a foundation, you encounter groundwater at 3 feet below grade. The foundation extends 5 feet below grade. What is the most appropriate immediate action?
Correct Answer
A) Stop work and consult with a geotechnical engineer
Encountering unexpected groundwater requires professional evaluation to determine proper dewatering methods, foundation design modifications, and waterproofing requirements. A geotechnical engineer should assess the situation before proceeding.
Why This Is the Correct Answer
When unexpected groundwater is encountered during excavation, stopping work and consulting a geotechnical engineer is the most appropriate immediate action. The engineer can assess soil conditions, water table levels, and hydrostatic pressures to determine the safest and most effective dewatering methods. They can also evaluate whether foundation design modifications or enhanced waterproofing systems are needed. This professional evaluation prevents costly mistakes and ensures compliance with building codes and safety standards.
Why the Other Options Are Wrong
Option B: Install well points and continue excavation
Installing well points without engineering consultation could be inappropriate for the specific soil and water conditions, and may not provide adequate dewatering for the depth and scope of excavation required.
Option C: Continue excavation and install a sump pump system
Installing a sump pump without proper engineering evaluation could be inadequate for the conditions and may not address hydrostatic pressure issues or soil stability concerns that come with groundwater.
Memory Technique
Think 'WATER = WAIT' - when you hit unexpected water, wait and get professional help before proceeding
Reference Hint
Florida Building Code, Chapter 18 - Soils and Foundations, and geotechnical engineering sections
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