Recommendations and 

 Conclusions Relative to 

 a Full-Scale Survey 



The pilot study was successful in documenting the capability of the cesium- 

 vapor gradient magnetometer to characterize ordnance contamination at the. Sea 

 Bright borrow area. This system can be used to document size, shape, orientation, 

 depth of burial, and location relative to the tow of ordnance-like targets and other 

 metallic objects. A full-scale, operational magnetometer survey which includes the 

 use of side-scan sonar for reconnaissance, an underwater low-light video camera, 

 DGPS, survey design and tracking software, and EOD trained divers for limited 

 ground-truthing is feasible and appropriate for detecting the presence, density, 

 approximate caliber, and location of ordnance at this site. 



The potential value and application of the results of such a full-scale survey 

 would be in locating any areas within the borrow which are not contaminated with 

 ordnance (i.e., possibly to the south or further offshore Asbury Park borrow). 

 Conversely, any areas which are so Uttered with large size ordnance that it would be 

 appropriate to keep the dredging operations clear of these areas for safety reasons 

 would also be documented. The data collected during a full-scale survey could be 

 used to design a cleanup operation (for example, using a surface rake). A repeat 

 survey after cleanup would determine the effectiveness of the cleanup. Finally, an 

 operational survey of other proposed borrow areas in this vicinity may be 

 appropriate prior to initiating other mining operations in order to ascertain the 

 presence of ordnance contamination at these sites. 



Several lessons learned from the pilot study should be incorporated into the 

 design of any proposed full-scale operational survey: 



a. An additional archival search (possibly by the St. Louis or Rock Island 

 District) to document historical information, firing fans, ranges, caliber, etc. 

 which may have impacted the offshore borrow would help in pl annin g and 

 interpreting the results of the survey. 



b. A full-scale survey should include EOD-certified divers for select ground 

 truthing of the data. 



52 



Chapter 9 Recommendations and Conclusions 



