(5) Access and Roadway Structures . Concrete is used for roadways, 

 bridges, structural anchors, and foundations as a part of coastal struc- 

 tures. Overpasses, footbridges, drainage facilities, and concrete pipe are 

 also ancilliary to many coastal structures. 



(6). Ocean Outfall and Discharge Structures . Because of the 

 excellent durability of concrete in the coastal environment, many ocean 

 outfall and discharge structures in the coastal zone are made of concrete. 

 These structures accommodate rain and flood water runoff as well as indus- 

 trial and domestic wastes. Ancilliary facilities, such as settling ponds 

 and pumping plants required to make these systems work are also frequently 

 constructed of concrete. 



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