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Structural steel protection below grade

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Hi sport fans:
 
I have a project under construction with structural steel tubes embedded in deep concrete piers for roof support and lateral restraint for open carport structures with shed roofs.  The plans called for the concrete piers to be poured up to the slab grade.  The piers are 3" 6" square with the columns centered in the piers.  Unfortunately the piers for some of the end columns that were adjacent to dirt planters were only poured up to the bottom elevation of the 4" concrete slab leaving the outboard face of the steel tube that is in line with the slab edge exposed to the dirt for 4".  I suppose was done for appearance.  The other 3 sides of the column are encased with concrete up to finished slab grade.
 
Is there a water proofing product that will endure a hostile environment (irrigation water and fertilizer) and protect the steel from corrosion as wll as a thick concrete cover below grade?
Or, should I spec a second 4" concrete pour bonded to clean concrete surfaces of the adjacent slab edge and top of concrete pier?  The steel below grade is currently coated with a shop coat of primer only.
 
Thanks in advance for any information that you steel and water proofing experts may provide.
 
Ray shreenan SE