The following two letters used as part of the number designating technical reports of research published under the Repair, 

 Evaluation, Maintenance, and Rehabilitation (REf^R) Research Program identify the problem area under which the report 

 was prepared: 



Problem Area 



Problem Area 



CS 

 GT 

 HY 

 CO Coastal 



Concrete and Steel Structures 



Geotechnical 



Hydraulics 



EM Electrical and Mechanical 

 El Environmental Impacts 



OM Operations Management 



Destroy this report when no longer needed. Do not retur 

 it to the originator. 



The findings in this report are not to be construed as an official 



Department of the Army position unless so designated 



by other authorized documents. 



The contents of this report are not to be used for 

 advertising, publication, or promotional purposes. 

 Citation of trade names does not constitute an 

 official endorsement or approval of the use of such 

 commercial products. 



COVER PHOTOS: 



TOP — Field Research Facility, Duck, North Carolina. 



BOTTOM — Testing of a repair option for the San Pedro 

 Breakwater. 



