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1. AGENCY USE ONLY «.«•>• oun*; 



2. atPOHT OATE 

 August 1995 



J. REPORT TYPE ANO DATES COVERED 



Final^Rejio^^ | 



4. mu AMD SUBTITLE 



Sediment Capping of Subaqueous Dredged Material Disposal Mounds: 

 An Overview of the New England Experience 1979-1993 



6. AUTHORtS) 



Science Applications International Corporation 



S. FUNDING NUMBERS 



" PERFORMING ORGANIZATION NAMeTs] ANO ZoORESsTeS) 



Science Applications International Corporation 

 221 Third Street 

 Newport, RI 02840 



3. PERFORMING ORGANIZATION 

 REPORT NUMBER 



SAIC-90/7573&C84 



9. SPONSORING; MONITORING AGENCY NAME(S) AND AOORESS(ES) 



U.S. Army Corps of Engineers - New England Division 

 424 Trapelo Road 

 Waltham, MA 02254-9 1 49 



10. SPONSORING i MONITORIMG 

 AGENCY REPORT NUMBER 



DAMOS Contribution No. 95 



II. SUPPLEMENTARY NOTES 



Available from DAMOS Program Manager, Regulatory Division 

 USACOE-NED, 424 Trapelo Road, Waltham, MA 02254-9149 



12*. DISTRIBUTION /AVAILABILITY STATEMENT 



Approved for public release; distribution unlimited. 



12b. DISTRIBUTION CODE 



13. ABSTRACT IMiMimum 4.QQ warxal 



This monograph focuses on four early capping projects. A detailed record of both disposal operations and subsequent monitoring of these capped 

 mounds provides a checklist of recommendations for a successful capping project The results of the first experimental capping project 

 (Stamford-New Haven), initiated in 1979, suggested that with careful navigational controls point-dumping at a taut-wired buoy could be used to 

 form a discrete mound of contaminated dredged material. In addition, these results suggested that precise deposition of capping material, both at 

 the center and at the flanks of the mound of contaminated material, could be accomplished with careful navigation and project planning. 



A successful capping project requires an effective monitoring program in addition to pre-project planning and organized dredging and 

 disposal operations. The DAMOS Program initiated a three-pronged approach to monitoring: 

 ensure physical stability and complete cap coverage of the mounds; 

 monitor the benthic ecosystem response and biological recovery rates; 

 analyze the ability of the caps to isolate chemical contaminants. 

 A coring investigation was initiated to resolve questions concerning the chemical integrity of the interior of the mounds. Many of the 

 recovered cores showed a distinct chemical boundary between the contaminated material and the cleaner material of the cap, up to 1 1 years after 

 capping. The investigation documented that the texture and distribution of contaminants in the disposed sediments depend to some extent on the 

 dredging and disposal techniques used to form the capped mound. 



Final recommendations from the early DAMOS capping experience include specific tasks to be completed before, during, and after the 

 formation of a capped mound. Pre-operational planning will ensure optimal conditions for a successfully capped mound. Dredge and disposal 

 operations should be organized and well-documented; the use of precision navigation and a taut-wired, moored buoy to ensure precise disposal of 

 dredged material are recommended. Finally, a reasonable and efficient monitoring program should be in place before dredging begins 



14. SUBJECT TERMS 



dredged material 

 monitoring 



capping 

 ocean disposal 



contaminated sediment 

 sediment chemistry 



15. NUMBER OF PAGES 



101 



16. PRICioqOOE 



SECURITY CLASSIFICATION 

 OF REPORT 



Unclassified 



18. SECURITY CLASSIFICATION 

 OF THIS PAGE 



SECURITY CLASSIFICATION 

 OF ABSTRACT 



20. LIMITATION OF ABSTRACT 



NSN 7540*01-280-5500 



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