(b) Maintenance. Settlement and general lowering by wave and tidal action, 

 occurring as expected in the early stages, were corrected during the long construction 

 period. Stability was reached before completion, and since final rock was placed, no 

 maintenance has been necessary. 



(8) Effect of Structure on Environment. 



(a) Physical. Early theories by engineers that orientation of the breakwaters 

 would cause tidal currents to wear away the Cape and keep the harbor at desired depths, 

 proved false. The Cape has extended in a north and northwesterly direction and Breakwater 

 Harbor has silted from a continually shifting silty bottom condition. Silting of the harbor 

 and the violent tidal action through the Gap were important reasons for completing the Gap 

 construction. 



(b) Biota. No recorded data obtained; verbal reports indicate heavy fish 

 population in area of breakwaters. 



(c) Aesthetics. In a generally isolated area, where, probably partly due to always 

 having been there, there has been Uttle objection to the sight of the natural rock structures. 



(9) Engineering. William Strickland, Consulting Engineer, Philadelphia, 

 Pennsylvania. 



(10) Construction Date, Cost and Contractors (Table 3). 



55 



