Table 1 (Continued) 



Date(s) Construction and Rehabilitation History 



1963 Additional stone was placed along the channel side of the north Jetty 

 from 226^+00 to 2420+00. The 1,000-lb to 4-ton stone was placed to 

 an elevation of +5 ft mlg, a top width extending 15 ft from the Jetty 

 center line, and a 1V:1.5H side slope. A total of 47,170 tons of 

 stone was placed at a cost of $301,900. 



1966 The south Jetty was extended seaward from 2420+00 to 2525+00. The 

 Jetty construction was similar to the Phase I Jetty construction 

 during I96O-I96I, with shell and riprap placed between retaining 

 dikes composed of dredged fill. The dikes were placed 30 ft on 

 either side of the Jetty center line and built to an elevation of 

 -1.5 ft mlg. The shell material was placed to -1 ft mlg and 1V:7H 

 side slopes, followed by the 100- to 500-lb riprap placed to +1 ft 

 mlg, a width of 20 ft, and 1V:3H side slopes. Total cost was 

 $806,500 using 80,000 cu yd of shell and 106,200 tons of riprap. 



1968 The south jetty was extended seaward from 2525+00 to 2649+00, using 



the same method of construction and design geometry stipulated during 

 the 1966 extension. Total cost was $982,200 using 113,500 cu yd of 

 shell and 114,000 tons of riprap. 



1971 The south Jetty was capped with armor stone from 2420+00 to 2650+00 

 (second phase construction) and extended seaward from 2649+00 to 

 2700+00 (first phase construction). The extended section was similar 

 to the earlier south Jetty extensions using a core (2650+00 to 

 2700+00) of shell and a cover layer of 100- to 500-lb riprap. Cost 

 of the extension was $394,400 using 4,400 cu yd of shell and 

 51,000 tons of riprap. The capped section of the Jetty consisted of 

 3- to 6-ton stone constructed to a crown elevation of +3 ft mlg, a 

 12-ft crown width, and 1V:1.5H side slopes. Additional stone, 

 weighing 500 lb to 2 tons, was placed on the channel side of the 

 Jetty, adjacent to the capping stone. The stone was placed starting 

 9 ft from the jetty center line to a design elevation of +1 ft mlg 

 and 1V:3H side slope. Prior to the capping, center line elevations 

 varied from -1 to +1.5 ft mlg (March 1970 survey). Total cost of the 

 improvements was $1,006,700 using 175,310 tons of stone. 



1974- Capping stone and channel side slope stone were placed on the south 

 1975 Jetty from 2649+00 to 2700+00 (seaward end). This work was identical 

 to the 1971 improvements, except that 2- to 4-ton stone was used to 

 cap the jetty. Existing center-line elevations varied from -1 to 

 +2 ft mlg (May 1974 survey). The total cost was $778,900 using 

 37,300 tons of stone. 



1985 With the exception of the addition of channel side slope stone, the 

 jetties have no repair history and are considered to be in good con- 

 dition. The jetties were constructed in water depths less than 



(Continued) 



13 



