Method To start the brine boil about a half gallon of water on the stove. Once the water has boiled add the salt and sugar and whisk to dissovle.
Chill the solution, then add another gallon of cold water to the pot.
Place the turkey in the pot and add enough cold water to cover the turkey. Add all of the ice. Because the pot was so large you must add the ice since you cannot put the pot in the refrigerator.
This method will work for any size turkey really since it is a very large pot.
Keep the turkey in the brine for at least two hours, check to see if you need to use more ice. You do not want the turkey coming to room temperature. Remember the danger zone is from 40 degrees to 140 degrees f.