b. Modified Estimates for Varied Locations . The basic estimate 

 can be modified (discussed earlier) by applying percentage variations 

 to the various labor costs and a mileage factor for towing costs to the 

 alternate location and arrive at an estimate of construction costs at 

 any location along the northeast coast. Examples of modified estimates 

 for two locations are shown in Table 3. 



Table 3. Modified Estimated Cost for Two Atlantic Coast Locations 



Method of Computation 



Total Cost 



Cost 

 Per Linear Foot 



With storage, 110' water depth; 

 basic cost @ Long Branch 



Tow mileage - 240 miles less @ 

 $150/mi = $36,000/unit = 



Labor - 15% reduction in onshore 

 labor 44% X $395,871,000 = 



Labor - 15% reduction in onsite 

 labor 11% X $395,871,000 = 



Totals 



$653,774,000 



- 1,296,000 

 -26,127,000 



- 6,532,000 

 $619,819,000 



$76,000 



- 150 

 -3,040 



- 760 

 $72,050 



Water 

 Depth 

 (feet) 



Cost With Oil Storage 

 Capacity 



Cost Without Oil Storage 

 Capacity 



Total 



Per Linear Foot 



Total 



Per Linear Foot 



Estimated Cost - Boston 



110 



$619,819,000 



$72,050 



$475,107,000 



$59,600 



90 



512,652,000 



59,600 



388,315,000 



45,200 



70 



418,377,000 



48,700 



320,611,000 



37,300 



50 



266,171,000 



30,900 



185,769,000 



21,600 



Estimated Cost - Cape Henlopen 



110 



$649,851,000 



$75,800 



$500,368,000 



$62,800 



90 



537,769,000 



62,800 



409,034,000 



47,900 



70 



439,139,000 



51,400 



338,083,000 



39,600 



50 



280,117,000 



32,800 



196,820,000 



23,200 



c. Cost Curves . Curves comparing unit costs for varying water depths 

 are shown in Figure 22. Details of the estimate are given in Table 4. 



V. CONCLUSIONS 



Given the concept of a combination breakwater-oil storage system 

 discussed in this study, the first consideration from a practical view- 

 point is whether or not such a concept is feasible. 



In view of the present knowledge and experience with open-sea con- 

 struction problems, and of the development of construction equipment for 



47 



