Table 4 (Continued) 



Date(3) Construction and Rehabilitation History 



1961 The landward end of the west Jetty was extended 1,550 ft and sections 

 of its 3-ft-wide concrete cap were repaired. The landward extension 

 was carried out between 19+50 and 36+00 (100-ft section was on exist- 

 ing jetty) using a 1.5-ft-thick by l6-ft-wide bedding layer of 25- to 

 200-lb stone, and overlayed with 200- to 2,000-lb stone (largest 

 pieces on outer surface) to an elevation of +5 ft mlg, a 4-ft crown 

 width, and 1V:1.5H side slopes. The repairs included resetting 



750 lin ft of concrete blocks and buttressing these and adjacent 

 blocks with stone at the following locations: 46+50 to 49+30, 65+00 

 to 67+00, and 126+00 to 131+50 (total of 1,030 lin ft). The cross 

 section of buttressing stone was identical to that used during I960 

 repairs (Figure 14b). Damage was caused by storm waves during Hurri- 

 cane Ethel in September I960. The cost of improvement was $160,800 

 with 6,600 and 12,900 tons of stone used on the extension and repair 

 areas, respectively. 



1962 New concrete capping was placed on top of the existing 5-ft-wide cap 

 section of the west Jetty between 143+00 and 174+89. The cap was 

 cast in place, 5 ft wide, and the crest elevation was +6.5 ft mlg. 

 Individual blocks were keyed and weighed a minimum of 15 tons but 

 were not to exceed a length of 40 ft. In addition, stone was placed 

 (to buttress the existing cap) to an elevation of +1 ft mlg, a crest 

 width of 8 ft on each side of the cap, and 1V:1.5H side slopes. A 

 2-ft bedding layer of 25- to 200-lb stone was placed beneath 1- to 

 2-ton buttressing stone. Preexisting crest elevations, from a 

 September I96I survey, were from +2 to +4.5 ft mlg. The total cost 

 of the improvements was $405,700 using 1,800 cu yd of concrete and 

 29,060 tons of stone. 



1966 Several segments of the 3-ft-wide west Jetty concrete cap section 



were repaired, similar to the I960 and I96I repairs (Figure 14b), by 

 resetting and buttressing displaced blocks. About 4,330 lin ft of 

 the cap blocks were reset, and buttressing of these and adjacent 

 blocks totaled 4,565 lin ft at the following locations: 35+50 to 

 46+60, 50+20 to 55+00, 59+00 to 63+75, 77+00 to 82+00, 94+25 to 

 103+10, 115+65 to 125+65, 130+60 to 131+60, and 134+90 to 139+80. 

 Also, additional 200- to 2,000-lb stone was placed along 480 lin ft 

 of the Jetty at the following sections: 34+15 to 34+75, 133+20 to 

 13l(+90, and 139+80 to 142+40. The design geometry for these sections 

 was to have a crown elevation of +6 ft mlg, a 6-ft crown width, and 

 1V:1.5H side slopes. Altogether, 49,000 tons of stone was placed, 

 and total cost of the repairs was $375,900. 



1968- The seaward half of the east Jetty was repaired. The design section 

 1969 consisted of a +6 ft mlg crown elevation, an 8-ft crown width, and 

 1V:1.5H side slopes. The repairs required 47,500 tons of 500-lb to 

 4-ton core stone and resetting 5,440 tons of cover stone. The repair 



(Continued) 



32 



