Table 4 (Continued) 



1968- involved removing existing 4- to 10-ton cover stone, adding core 

 1969 stone, and replacing the cover stone. The work was carried out on 

 (cont.) two sections, 190+00 to 194+00 and 200+40 to 247+70. A 1967 survey 

 of the jetty showed average center-line elevations of +3.5 and 

 +4.5 ft along the repair areas and remaining Jetty, respectively. 

 Total cost of the repairs was $498,800. 



I97O- The landward end of the east Jetty was repaired from 119+50 to 



1971 112+60 and extended 490 ft to 107+70. The west Jetty was repaired 

 from 142+40 to 124+90, from 63+00 to its landward end at 17+75, and 

 extended 150 ft to 16+25. Stone size varied from 300 lb to 2 tons, 

 with the largest pieces used as cover stone. The landward extensions 

 had a 1-ft bedding layer of shell material placed prior to the stone. 

 The design geometry (Figure I4c) had 1V:1.5H side slopes, a +6 ft mlg 

 crown elevation, a 5-ft crown width on the landward sections, and a 

 6-ft crown width on the remaining west Jetty section. Center-line 

 elevations of the sections to be repaired averaged +4 ft mlg for the 

 west Jetty (1968 survey), +5 ft mlg for the east Jetty (1970 survey), 

 and the natural bottom of the east Jetty extension varied from +6 to 

 -5.5 ft mlg. The approximate cost of the repairs excluding South 

 Pass east Jetty which also was repaired under the same contract was 

 $300,000 using 30,000 tons of stone and 1,000 cu yd of shell 

 material, 



1972 The east Jetty was repaired from 140+00 to 167+00 using 3- to 6- ton 

 armor stone. The design geometry (Figure 13b) specified a +6 ft mlg 

 crown elevation, 5- and 8-ft crown widths shoreward and seaward of 

 146+00, respectively, and 1V:1.5H side slopes. An April survey 

 (before repairs) of the Jetty showed an average center-line elevation 

 of +2.5 ft mlg within the repair area, and +3 ft mlg elsewhere. Cost 

 of the repairs was $349,000 using 36,900 tons of stone. 



1974 Two sections of the east Jetty were repaired using the 1972 design 

 geometry and stone size (Figure 13b). Crown widths were 5 ft, from 

 117+00 to 140+00, and 8 ft from 167+00 to 204+50. Cost of the re- 

 pairs was $1,399,000 using 64,500 tons of stone. Figure 15 is a 

 photograph taken in February showing three dredges operating between 

 the Jetties and a grounded vessel near the seaward end. 



1975 The east Jetty was repaired with 3- to 6-ton stone at locations 

 140+00 to 158+50 and 204+50 to 249+45 (seaward end). The design geo- 

 metry (Figure 13b) had an elevation of +6 ft mlg, 1V:1.5H side 

 slopes, and an 8-ft-wide crown (except from 140+00 to 146+00 which 

 was 5 ft wide). After repairs were completed, it was noted that 

 additional stone between 204+50 and 249+45 would be needed to stabi- 

 lize the gulf side slope because some of the new slope stones were 

 removed during periods of heavy wave action. The total cost was 

 $2,306,800, and 103,660 tons of stone were required. 



(Continued) 



33 



