Table 7 (Concluded) 



Date(s) Construction and Rehabilitation History 



1979 A field inspection on 26 September 1979 revealed a total of seven 

 dolosse and five tribars broken above the still-water level (swl) 

 between sta 16+00 and 20+00. No repair work was recommended. 



1982 A reconnaissance report of August 27 expressed concern of the 

 steep and degraded harbor-side slopes, and plans were initiated 

 for rehabilitation work. Hurricane Iwa of November 23 reportedly 

 produced depth-limited breaking waves at the structure. An in- 

 spection subsequent to the hurricane revealed considerable move- 

 ment of concrete armor units which may have caused armor unit 

 breakage below water. Nine dolosse and one tribar unit were found 

 broken. Movement and shifting of stones on the crest of the 

 breakwater were noted in three areas. Also, overtopping waves had 

 displaced harbor-side stone and in one area had created a trough 

 along the harbor-side toe. 



1983 An underwater inspection was conducted on 9 August. This detailed 

 inspection revealed that the underwater slope of the breakwater 

 head was approximately 1V:1H, much steeper than it was thought to 

 be. The inspectors recommended repair of the head to prevent a 

 possible catastrophic failure of the head that could be initiated 

 on steep underwater slopes. 



1984 Figure 18 is a photograph of the breakwater taken from the head 

 looking landward. A general design memorandum for the rehabili- 

 tation of the breakwater in 1985 was prepared. The proposed work 

 was as follows: one and two layers of randomly placed dolosse on 

 the sea- and harbor-side slopes of the head; one layer of 11-ton 

 dolosse on the sea-side slope between stations 18+35 and 20+45; 

 one layer of uniformly placed, 6.5-ton tribars on the harbor-side 

 slope between sta 12+00 and 15+00; and concrete ribs on the crown 

 between sta 12+00 and 20+45. Portions of this proposed work were 

 model tested (Markle and Herrington 1983). The estimated first 

 cost of this rehabilitation was $3,500,000 based on January 1984 

 price levels. 



(Sheet 3 of 3) 

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