Horizontal crack in your stem wall could be sign of a serious problem.
The oxidized existing rebar is cut out.
The rebar is replace with NEVERUST non-ferrous composite.
Take a look at the finished product.
Rebar oxidation can be a serious problem from stem walls. Over time the stem wall the concrete will spall and split, which weaken the concrete. Fortuantly as Arizona Foundation Solutions we have just the fix, NEVERUST non-ferrous composite.