Chappy...They use the toxic crap 'cuz it works great and in the long run its cheaper than anything else. Of course their long term does not take into account any enviromental damage. To them it makes economic sense, and saves tens of millions a year. Just like dredging and capping the area around the base in Bremerton. The Navy is pretty proud of that one. Somewhere in the big scheme they kinda forgot the part that in that process they managed to spread that crap as far as the current would carry it and now instead of having a localized problem the whole inlet is a dump.