REPORT DOCUMENTATION PAGE

Form Approved

REPORT DOCUMENTATION PAGE

OMB No. 0704-0188

Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering

and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of

information, including suggestions for reducing this burden, to Washington Headquarters Services, Directorate for Information Operations and Reports, 1215 Jefferson Davis Highway, Suite

1204, Arlington, VA 22202-4302, and to the Office of Management and Budget, Paperwork Reduction Project (0704-0188), Washington, DC 20503.

1. AGENCY USE ONLY (Leave blank)

2. REPORT DATE

3. REPORT TYPE AND DATES COVERED

June 1998

Final report

4. TITLE AND SUBTITLE

5. FUNDING NUMBERS

Guidance for Subaqueous Dredged Material Capping

6. AUTHOR(S)

Michael R. Palermo, James E. Clausner, Marian P. Rollings, Gregory L. Williams,

Tommy E. Myers, Thomas J. Fredette, Robert E. Randall

7. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES)

8. PERFORMING ORGANIZATION

REPORT NUMBER

See reverse.

Technical Report DOER-1

9. SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES)

10. SPONSORING/MONITORING

AGENCY REPORT NUMBER

U.S. Army Corps of Engineers

Washington, DC 20314-1000

11. SUPPLEMENTARY NOTES

Available from National Technical Information Service, 5285 Port Royal Road, Springfield, VA 22161.

12a. DISTRIBUTION/AVAILABILITY STATEMENT

12b. DISTRIBUTION CODE

Approved for public release; distribution is unlimited.

13. ABSTRACT (Maximum 200 words)

When dredged materials proposed for open-water placement are found to require isolation form the benthic environ-

ment due to the presence of contaminants, capping may be appropriate for consideration as a management action. This

report is intended to provide technical guidance for evaluation of capping projects. From a technical perspective, this

guidance is applicable to dredged material capping projects in ocean waters as well as inland and near-coastal waters.

Subaqueous dredged material capping is the controlled, accurate placement of contaminated dredged material at an

appropriately selected open-water placement site, followed by a covering or cap of suitable isolating material. A number

of capping operations under a variety of placement conditions have been accomplished. Conventional placement equip-

ment and techniques are frequently used for a capping project, but these practices must be controlled more precisely than

for conventional placement. Level bottom capping (LBC) is defined as the placement of a contaminated material in a

mounded configuration and the subsequent covering of the mound with clean sediment. Contained aquatic disposal is

similar to LBC but with the additional provision of some form of lateral confinement (e.g., placement in natural bottom

depressions, constructed subaqueous pits, or behind subaqueous berms) to minimize spread of the materials on the bottom.

(Continued)

14. SUBJECT TERMS

15. NUMBER OF PAGES

Capping

Dredged material Open-water disposal

302

Contaminated sediments

Dredging

16. PRICE CODE

17. SECURITY CLASSIFICATION

18. SECURITY CLASSIFICATION

19. SECURITY CLASSIFICATION

20. LIMITATION OF ABSTRACT

OF REPORT

OF THIS PAGE

OF ABSTRACT

UNCLASSIFIED

NSN 7540-01-280-5500

Standard Form 298 (Rev. 2-89)

Prescribed by ANSI Std. Z39-18

298-102