Table 20 (Concluded) 



Date(s) Construction and Rehabilitation History 



1967- The harbor was deepened to 35 ft. Federal support of the sand 



1968 transfer plant ended. 



1969 Rehabilitation of the 550-ft seaward section of the north jetty was 

 made with 10- to 14-ton capstone on lV:2H-side slopes (Figure 34). 

 A total of 2,000 tons of armor stone was placed at a cost of 

 $83,000. A design wave height of 15 ft and a 14-sec wave period 

 were used to select the capstone size. 



1985 Present plans call for repairs to 1,300 ft of the south jetty. The 

 jetty would be made impervious to sand motion via injection of sili- 

 cate grout on the shoreward 800 ft and via a rubble filter on the 

 seaward 500 ft. For slope protection, 5- to 10-ton stone were 

 placed on 200 ft of the channel side (near shoreward end) . The 

 design wave height of 12.7 ft (obtained using the method outlined in 

 Seelig and Ahrens (1980) used to compute size of cover stone to pro- 

 vide protection of the filter layer on the seaward end of repair) . 

 Cover stone will be 8 to 14 tons with an underlayer of 800- to 

 2,400-lb stone and 3- to 6-in. filter stone. The estimated first 

 cost is $2.2 million. 



(Sheet 3 of 3) 

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