(a) Lower level concrete pours. 



(1) Geographical location of casting sites in relation 

 to installation site. 



(2) Use of established facilities (shipyards, drydocks) 

 versus facilities specifically setup for the project. 



(b) Upper level pours and fitting out. 



(1) Location of available deepwater sites and 

 accessibility to the installation site by natural channels. 



(2) Necessity of dredging basins or channels. 



(c) Transportation of units. 



(1) Flotation and stability. 



(2) Location of towing points and mooring gear. 



(d) Placing of units at installation site. 



(1) Necessary site preparation and equipment 

 available. 



(2) Source of stone. 



(3) Operation sequence from moving unit to site, 

 to positioning, and sinking. 



(e) Weather and sea conditions, and their effect on 

 items (a) through (d) . 



Studies of weather and sea conditions (Saville, 1954; U.S. Naval 

 Weather Service Command, 1970) were used to estimate conditions to be 

 expected during construction. An indication of wave heights and frequency 

 both annually and monthly for various locations along the U.S. east coast 

 are given in Figures 6 through 14. Figure 15 provides wave heights as 

 a function of percentage of occurrence from various directions. The data 

 were particularly useful at this stage in developing construction time 

 and delay costs for the estimate, both at the site and along the towing 

 routes. 



Based on the foregoing, a construction program was planned that 

 included the following operations: 



(a) Establishment of a dike-enclosed basin for construction 

 of lower parts of the caisson units. 



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