borrow area. Magnetic signatures obtained during the pilot study indicated the 

 presence of numerous dipole objects corresponding to ordnance signatures in the 

 areas surveyed. The occurrence of these characteristic signatures diminished 

 toward the south. The most common detected dipole objects were: 

 (a) comparable in size to 6- to 12-in. shells, (b) located at or near the sand 

 surface, and (c) oriented generally parallel to the shoreline (north-south). This 

 information has implications concerning the mobility of the ordnance and methods 

 to be used in any potential site cleanup operations. Other specific magnetic 

 signatures have been identified as representing metal spheres (such as a cannon- 

 ball), marine clutter (such as a zone of odd-shaped metal fragments), and larger 

 objects (drums and possibly shipboard jetsum). Further post-processing of the 

 magnetic data would give additional information concerning individual objects and 

 the orientation, approximate size, and three-dimensional location of these defined 

 targets. 



Figure 10. Custom-fabricated mount for cesium-vapor sensors 



28 



Chapter 6 Magnetometer 



