Fouling of the tower's underwater structure by 

 barnacles, mussels, and other sessile marine organ- 

 isms is controlled by an annual scraping. The work 

 is done by hookah (A) and scuba (B) equipped divers 

 using scraping irons and hydraulic hammers. The 

 scraped-off animals and their shells are removed 

 from the area so as to keep the sea floor in a natural 

 state. In fact nothing is thrown over the side that may 

 litter the bottom. 



Metal protection overlapping the tidal and splash 



zone (-2.5 to 14.5 feet) is provided by a 3/16-inch 



neoprene coating. Other metal areas are painted 

 periodically with epoxy paint. 



137 



