uiZ 

 O'- 



3a 

 O a. 



Q « 



Ui •- 



S 



I- 



180-1 



160- 



140 



120 



100 



80- 



60 



SUPPORT TRAFFIC (TONALS) 



• TUG W/ FULL BARGE 

 o TUG W/ FULL BARGE 

 1^ CREW BOAT 



* TUG W/ EMPTY BARGE 

 V TUG W/ FULL BARGE 



• S • 



t 



I 1 1 1 1 

 .01 



.1 



FREQUENCY (kHz) 



1.0 



10.0 



Figure 5. Maximum source levels of the noise generated by logistic support traffic 

 measured in the vicinity of a construction site in the Beaufort Sea. 



180 



160 



uj 140- 



> 



UJ 



Sl 120 



3 a. 



a. 



Q a> 



(- ffi 

 <2. 



1 80 



t- 



60 



SEMI-SUBMERSIBLE PLATFORM (ATLANTIC) 

 o DIESEL (DRILLING) 

 • NON-DIESEL (DRILLING) 

 '^ DIESEL (TRIPPING) 



t 



.01 



.1 

 FREQUENCY (kHz) 



1.0 



10.0 



Figure 6. Maximum source levels of the noise generated from a 

 semi-submersible drilling platform located in the Atlantic Ocean. 



H-13 



