Establish the Decontamination Site When preparing the site, three shuffle pits will need to be prepared. Each pit will require at least two 50 lb drums of Super Tropical Bleach (STB). Each pit is filled with a mixture of dirt and STB at a ratio of 2 shovels of STB and 3 shovels of earth. These pits, depending on the amount of use, will need to be refreshed with STB once every hour or after 10 personnel have shuffled through them.