Figure 8. Hydrophone locations for Barking Sands Tactical Underwater 

 Range (BARSTUR). (From NPOLA, 1969.) 



Specific seat loor studies were made by NAVOCEANO and others 

 during 1964 (Belshe, 1967). Records from the seven sediment cores (from 

 water depths of 2,400 to 6,000 feet) and various underwater photographs 

 indicated that a thin veneer of sand covered nearly 70% of the seat loor at the 

 site. Outcrops of basaltic rock accounted for most of the other 30%. About 

 two-thirds of the seaf loor at the site had a slope of 5 degrees or less. Nearshore 

 investigations indicated patches of sand distributed in pockets formed in the 

 bedrocks. The greatest thickness of sediment measured in the nearshore region 

 was 18 inches. Maximum relief in the area was 3 feet. 



Each hydrophone structure, weighing 360 pounds in water, supports 

 a single hydrophone. These structures are similar to the units used at AUTEC. 

 The detailed configuration is shown in Figure 9. 



The 4-foot -wide by 20-foot-long by 1 -foot-high junction box rests 

 directly on the seaf loor and is secured by five grouted-in stakes. 



