[Gatto Nero]

Keep in mind that just because the breakwater has been there since 1968 if it was not permitted at that time, a good bet, or it as not been maintained for the past five years, then it may not be considered grandfathered. In which case you may need to prove the need for it. In order to do that you would need to prove the existence of consistent 2' waves over a 4 hour period on at least 4 different occasions between May 15 and October 15. I can tell you from experience (5 years worth) that it's possible, but not easy, to do. Good luck.

Edit: I should add that if "The proposed site for the breakwater is exposed to a single radial fetch of at least 4 miles between compass headings 300 and 330 degrees as measured from true north" then the above proof should not be necessary. There is a map available on the DES website that shows where you can pretty much automatically get approval for a breakwater but I couldn't immediately put my hands on it.