Final answer:
Isolated spread footings are most appropriate for hard rock conditions where the foundation is stable and can support the loads. They are not suitable for soft soil, sloping ground, or high water table scenarios due to the risk of instability and settlement issues.
Step-by-step explanation:
Isolated spread footings are most suitable for conditions where the soil has sufficient strength and low compressibility to support the loads without excessive settlement or risk of failure. One scenario that meets these criteria is hard rock conditions, where the bedrock provides a stable and robust foundation for the footing.
By contrast, isolated spread footings are generally not well-suited for soft soil conditions, sloping ground, or areas with a high water table. Soft soils might not provide adequate support for the structure, leading to excessive settlement or failure. Sloping ground requires specialized foundation solutions to ensure stability, and a high water table can lead to hydrostatic pressure problems and potentially undermine the footing.
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