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Query on foundation approach

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An existing beach house. The residence is underlain by 5 to 20 feet of sand over bedrock (north to south). The southern 1/3 of the residence is founded on caissons in bedrock while the northern portion is on spread footings and piers on sand. To mitigate differential settlement  what methods of foundations or underpinning are available or suggested. Methods which would not destroy the existing house or structure. Access is very limited. I would appreciate any suggestions.

Chris Lillback P.E.