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

 Evaluation, Maintenance, and Rehabilitation (REN/IR) Research Program identify the problem area under which the report 

 was prepared: 



Problem Area Problem Area 



CS Concrete and Steel Structures EM Electrical and Mechanical 



GT Geotechnical El Environmental Impacts 



HY Hydraulics OM Operations Management 



CO Coastal 



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 — Author delivers 42-ton dolos to Crescent 

 City Harbor, California. 



