Mark, the answer depends on the topo ie the slope and terrain. Consult a local structual engineer..
proper drainage away, footers, rock, filter cloth, french drainect ect ( water is a hydrolic tool)
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As Brittany stated earlier, we only use hot-dipped galvanized in this application. It is not a code issue but it does make a huge impact on quality and what will be seen for years to come.