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Concrete mix for placement in water

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We have a project with 24" dia. drilled caisson foundation.  The soils report did not indicate a water table problem, yet we are finding water in many of the caisson locations.  The water is seeping slowly in the last five feet.
The borings are in a clay layer, and hole integrity is not being adversely affected.  The contractor intends to pump the hole prior to placing concrete.  There will still be a wet condition, and some of the water will be displaced by the concrete during placing.
Are there any special precautions or mix changes that should be implemented?
How is the mix design different when placing concrete under water? (not exactly my problem, but I find the question interesting)
All input is appreciated,
Paul Feather