What type of excavation equipment is most appropriate for digging a foundation in sandy soil with a high water table?
Correct Answer
B) Excavator with dewatering system
In sandy soil with a high water table, an excavator combined with a dewatering system (wellpoints or sumps) is most appropriate. The dewatering system controls groundwater infiltration while the excavator provides the precision needed for foundation work.
Why This Is the Correct Answer
Sandy soil with a high water table presents two major challenges: soil instability due to water saturation and continuous groundwater infiltration into the excavation. An excavator provides the precision and reach needed for foundation excavation work, while a dewatering system (wellpoints, sumps, or pumps) actively removes groundwater to maintain dry working conditions. This combination addresses both the excavation needs and water management requirements. Without proper dewatering, the excavation would continuously fill with water, making foundation work impossible.
Why the Other Options Are Wrong
Option A: Standard backhoe
A standard backhoe alone cannot address the high water table issue - it would be working in a water-filled excavation, making precise foundation work impossible and creating unsafe conditions.
Option C: Bulldozer
A bulldozer is designed for surface grading and pushing material, not for the precision digging required for foundations, and it cannot address water table issues.
Option D: Trenching machine
A trenching machine is designed for narrow, linear excavations like utility trenches, not the wider, more complex excavations required for building foundations.
Memory Technique
Think 'Sandy + Wet = Excavator + Dewatering' - you need both tools to handle both problems (digging + water removal)
Reference Hint
Florida Building Code Chapter 18 - Soils and Foundations, or construction textbook chapters on excavation and dewatering systems
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