We recently moved into a house on a well. We do have a water softener. Two of our sinks on the far side of our house produce a sulphuric smell when the cold water is turned on. The hot water on the same sinks do not have the smell. The remaining four sinks in other parts of our house does not have a problem (no smell). We did replace the faucet fixtures and supply lines recently on the two sinks in question. Any ideas as to why these two sinks would have this problem?