Table 18 



Cost Summary for Alternative 3: Crawlcat/Crawldog 



Item 



Present Value 

 ($1997) 



Annual Cost 1 

 (S) 



Initial Cost 



Crawldog 



2.75 M 



230.0 K 



Pipeline 



452.2 K 



37.8 K 



Booster pumps & engines 2 



186.0 K 



15.6 K 



%-ton 4-WD diesel truck 



21.7 K 



1.8 K 



Storage facility (3,000 SF@ $75/SF) 



225.0 K 



18.8 K 



Subtotal 



3.635 M 



534.0 K 



With contingencies @ 40 percent 



5.089 M 



748.0 K 



E&D (15 percent) 



763.0 K 





S&A (1 percent) 



509.0 K 





Initial cost 



6.361 M 



532.0 K 



Annual Operating Costs 3 



550.0 K 



Capital Replacement Costs 



Replacement Crawldog 



2.75 M 



230.0 K 



Pipeline 



98.5 K 



8.2 K 



Booster pumps & engines 



58.7 K 



4.9 K 



%-ton 4-WD diesel truck 



29.5 K 



2.5 K 



Total Annual Cost 



1 .328 M 



1 Assume 7 3 /b percent interest, 30-year return period. 



2 Assume primary booster is part of Crawldog; only one additional booster required. 



3 $5.50/m 3 x 100,000 m 3 (includes labor). 



Alternative 4: Submerged Mobile Plant {Punaise) 



The fourth alternative examined is a submerged mobile system called Punaise (Brouwer, 

 Visser, and van Berk (1991), Brouwer, van Berk, and Visser (1992), and Williams and Visser 

 (1997)). The Punaise (Dutch for thumbtack) is a water-tight, submerged dredge pump system 

 that can be lowered to the seafloor for sand/silt removal. It is controlled from a shore station that 

 is connected by an umbilical line that contains the control connections, electrical power supply, 

 and the slurry discharge line. Because the Punaise is located on the seafloor, it is able to operate 

 in adverse wave conditions that prevent usual dredging/bypassing operations, and it does not 

 affect normal navigation activities. In addition, it may be easily moved within the same general 

 area, or it can be relocated to a different site altogether. 



64 



Chapter 5 Other Bypassing Studies 



