220 n 



200- 



PRUDHOE BAY AREA (TONALS) 

 o REINDEER ISLAND 

 • NIAKUK 3 COST WELL 



UJ 



> 



UJ 



^ ^^ 

 uZ 

 O'- 



O a. 



o « 

 lu "■ 

 t-CD 



s 



180- 



160- 



140- 



120- 



100- 



t 



180-1 



160- 



.01 



.1 

 FREQUENCY (kHz) 



1.0 



10.0 



Figure 1 . Average source level of noise generated from 

 two drilling sites in Prudhoe Bay. 



UJ 



> 



UJ 



-I ^ 

 ujS 



3a 

 O a. 



O « 

 UJ '" 

 HOD 

 <2. 



2 



140- 



120- 



100 



80- 



60- 



t 



.01 



ARNAK ARTIFICIAL ISLAND 

 CONSTRUCTION SITE (TONALS) 



• EAST 



o NORTH 



1.0 



FREQUENCY (kHz) 



Figure 2. Average source level of noise generated from 

 a construction site in the Beaufort Sea. 



10.0 



H-11 



