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Are you talking about putting a garboard drain plug on the bottom of the boat?? What do you mean by, "a foot in from the back"? Don't put that plug on the bottom of the boat. I wouldn't even bother with it at all. You could put a garboard plug on the transom but how do you know how high to put it to clear the glass of the bottom and be into the foam? The keel is really thick back there and the transom is cored with wood. If there is water in there, how will you seal the wood core of the transom where you drill? If you do proceed it may take years, if ever, to dry out any water.