Total release of butyltin into coastal waters is a combination of the 

 different leach rates of the different paints, and the area of paint 

 exposed to the water. The degree to which the leached paint organotin 

 materials is concentrated depends not only on the area of paint but on the 

 relative mobility of the painted vessels. Many pleasure craft never leave 

 the dock while commercial vessels remain immobile no longer than 

 necessary. 



111-24 



