REPORT DOCUMENTATION PAGE 



form approved 



0MB No. 



0704-0188 



Public reporting concern for the collection of information is estimated to average 1 hour per response including the time for reviewing instructions, 

 searching existing data sources, gathering and measuring the data needed and correcting 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 

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 and to the Office of Management and Support, Paperwork Reduction Project (0704-0188), Washington, D.C. 20503. 



1. AGENCY USE ONLY (LEAVE BLANK) 



2. REPORT DATE 



December 2001 



3. REPORT TYPE AND DATES COVERED 



FINAL REPORT 



4. TITLE AND SUBTITLE 



Monitoring Cruise at the New London Disposal Site August 2000 



6. AUTHOR(S) 



Science Applications International Corporation 



5. FUNDING NUMBERS 



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



Science Applications International Corporation 

 221 Third Street 

 Newport, RI 02840 



8. PERFORMING 

 ORGANIZATION REPORT 

 NUMBER 



SAIC No. 512 



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



US Army Corps of Engineers-New England District 

 696 Virginia Road 

 Concord, MA 01742-2751 



10. SPONSORING/MONITORING 

 AGENCY REPORT NUMBER 



DAMOS Contribution Number 133 



11. SUPPLEMENTARY NOTES 



Available from DAMOS Program Manager, Regulatory Division 

 USACE-NAE, 696 Virginia Rd, Concord, MA 01742-2751 



12a. DISTRIBUTION/AVAILABILITY STATEMENT 



Approved for public release; distribution unlimited 



12b. DISTRIBUTION CODE 



13. ABSTRACT Environmental monitoring of the New London Disposal Site (NLDS) occurred from 10 to 12 August 2000 at the New London 

 1991 (NL-91) and Dow/Stonington (D/S) Mound Complex. The NL-91 and D/S Mound Complex is a historic sediment deposit at the NLDS 

 composed of material dredged and disposed during the 1991 and 1992 disposal season. Previous REMOTS sediment profile surveys have shown 

 that the mound complex has been successfully recolonized by benthic organisms since 1992, while previous bathymetric surveys have indicated a 

 need to increase the thickness of the capping dredged material (CDM) over the mound. Since the 1996-1997 disposal season, over 30,000 cubic 

 meters of supplemental CDM has been placed over the NL-91 and D/S Mound Complex, as part of the cap augmentation plan. The August 2000 

 bathymetric survey showed a depth difference over the NL-91 and D/S Mound Complex relative to September 1997. Accumulations of sediment 

 up to 0.5m thick ^ere attributed to placement of supplemental CDM. This was also apparent in the majority of the REMOTS images which also 

 served to demonstrate that the footprint of the supplemental CDM completely covered the original unacceptably contaminated material (UDM) 

 deposit and that the supplemental CDM had been colonized by a benthic community comprised of Stage II and Stage III organisms. 



IThe Seawolf Mound was developed in the northwest quadrant of NLDS during the 1995-96 disposal season by the placement of 877,500 cubic 

 meters of dredged sediment from three separate projects. Dredging and disposal operations were tightly controlled to create a single capped 

 disposal mound, the U.S. Navy Seawolf Mound. Comprehensive bathymetric and environmental surveys were performed over the Seawolf 

 Mound in 1997 and 1998. The August 2000 bathymetric survey showed no significant changes in the topography of the Seawolf Mound relative 

 to the July 1998 survey. REMOTS data showed the Seawolf Mound continued to be populated by a benthic community of advanced successional 

 stage assemblages. 



The US Coast Guard Academy (USCGA) mound was developed within the northeast quadrant of NLDS during the 1994-95 season and consists 

 of 124,000 cubic meters of sediment from the Thames River. This mound was considered a confined aquatic disposal mound. Based on findings 

 of the initial survey in August 1995, follow on monitoring was deferred until August 2000. A Stage III benthic successional stage was noted by 

 REMOTS samples over the USCGA mound. Overall, the August 2000 REMOTS survey showed healthy benthic conditions at USCGA, as well 

 as the other project mounds (NL-91 and D/S and Seawolf) and the NLDS reference areas (NLON REF, NE REF and WEST REF). The average 

 Organism-Sediment Index (OSI) values at the three mounds (NL-91 and D/S, +8; Seawolf, +8; and USCGA, +9) were all greater than the 

 average for the reference areas (+7). Both the mound and reference area OSI values are indicative of healthy or undisturbed benthic habitat 

 quality at the time of the August 2000 survey. 



14. SUBJECT TERMS DAMOS, Seawolf, Dredged Material, Benthic Recolonization 



15. NUMBER OF TEXT PAGES: 63 



16. PRICE CODE 



17. SECURITY CLASSIFICATION OF 

 REPORT Unclassified 



18. SECURITY CLASSIFICATION 

 OF THIS PAGE 



19. SECURITY CLASSIFICATION 

 OF ABSTRACT 



20. LIMITATION OF 

 ABSTRACT 



