Table 4 (Continued) 



Date(s) Construction and Rehabilitation History 



1940- The majority of jetties' maintenance consisted of placing stone on 

 1949 the east jetty in 1940, 1941, 1948, and 1949. A total of 241,515 

 tons of stone was placed on jetty sections totaling approximately 

 18,000 lin ft at a cumulative cost of $2,648,000. Other east jetty 

 repairs were made in 1946 by placing about 6,960 tons of asphalt at a 

 cost of $76,800. In 1942, the west jetty was capped with concrete 

 blocks from 148+00 to 154+54 and intermittent concrete blocks (alter- 

 nate block and gap sections were 20 to 25 ft long) from 169+75 to 

 174+85 at a cost of $22,300. (The capping was to have extended to 

 the seaward end.) A September 1947 survey of the west jetty between 

 30+00 and 191+55 (seaward end) showed typical center-line elevations 

 of +2 to +3 ft mlg over the landward half and +2 to -1 ft mlg over 

 the seaward half (1942 capped sections were +3.5 to +4.5 ft mlg). A 

 subsequent survey, taken during August 1949 between 148+00 and 

 191+55, showed a general settlement of 1 to 1.5 ft compared to the 

 1947 survey. 



1950- The west jetty was repaired between 35+00 and 191+55 by placing con- 

 1952 Crete blocks and armor stone to a design elevation of +6 ft mlg. In 

 1950, armor stone was placed from 174+85 to 191+55 with a design 

 crown width of 6 ft and 1V:1.5H side slopes. Rectangular capstones, 

 weighing 10 tons or more, were placed on top of the existing concrete 

 cap. Rectangular (as opposed to irregularly shaped) capstone was 

 used to create a relatively impervious jetty and to provide a suit- 

 able base for possible future concrete capping. Side slopes were 

 built up on a layer of riprap stone, 25-lb to 4-ton core stone, and a 

 cover layer of 5- to 10-ton stone (buttressing the capstones). 

 Approximately 35,000 tons of stone were used, and the actual center 

 line elevation varied between +5 and +6 ft mlg. Also completed in 

 1950 was the concrete capping between 154+54 and 174+85. The precast 

 blocks were 5 ft wide, 3 to 7 ft high, and weighed 10 tons or more. 

 The blocks were keyed (tongue and groove) on their ends and top, and 

 once positioned were grouted with additional concrete. The capped 

 section had typical center-line elevations of +6 to +6.5 ft mlg. 

 During 1951-1952, the remaining section, 11,954 ft in length, was 

 capped with concrete blocks. (A survey of this section, taken in De- 

 cember 1950, showed typical center-line elevations of +1 to +3 ft 

 mlg.) The construction method was similar to the 1950 capping, using 

 precast keyed blocks which were grouted in place. The blocks were 

 specified to have a minimum length of 8 ft and widths of 3 and 5 ft 

 on the landward and seaward sides of 142+45, respectively. The 

 actual average length of the blocks was 15 ft, their weight varied 

 from 10 to 16 tons, and their height varied from 3 to 7 ft. On 18 

 March 1952, prior to jetty completion, a "tidal" wave dislodged 

 180 blocks. At the time, all blocks were in place, but grouting had 

 not been completed. A total length of 2,815 ft of cap blocks was 

 reset and grouted at the following locations: 48+00 to 50+75, 79+60 

 to 80+60 to 95+60, 97+75 to 98+75, 101+45 to 102+80, 117+00 to 



(Continued) 



29 



