REPORT DOCUMENTATION PAGE 



Form approved 

 OMB No. 0704-0188 



Public reporting concern for the collection of information It 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 Headquarters Services, Directorate for Information 

 Observations and Records, 1215 Jefferson Davis Highway, Suite 1204, Arlington VA 22202-4302 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 



January 1996 



3. REPORT TYPE AND DATES COVERED 



Final report 



4. TITLE AND SUBTITLE 



Monitoring Cruise at the Western Long Island Sound Disposal Site, July 1992 



5. FUNDING NUMBERS 



6. AUTHOR(S) 



F.C. Eller and R.W. Williams 



7. PERFORMING ORGANIZATION NAMEfS) AND ADDRESSES) 



Science Applications International Corporation 

 221 Thrid Street 

 Newport, Rl 02840 



B. PERFORMING ORGANIZATION REPORT 

 NUMBER 



SAIC-C108 



9. SPONSORING/MONITORING AGENCY NAMEfS) AND ADDRESSES) 



US Army Corps of Engineers-New England Division 

 424 Trapelo Road 

 Waltham, MA 02254-9149 



10. SPONSORING/ MONITORING AGENCY 

 REPORT NUMBER 



DAMOS Contribution 

 Number 102 



11. SUPPLEMENTARY NOTES 



Available from DAMOS Program Manager, Regulatory Division 

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



12a. DISTRIBUTION/AVAILABILITY STATEMENT 



Approved for public release; distribution unlimited 



12b. DISTRIBUTION CODE 



13. ABSTRACT 



In July 1992, the Western Long Island Sound Disposal Site (WLIS) was surveyed as part of the Disposal Area Monitoring 

 System (DAMOS) Program. The survey was conducted to assess the effects of recent disposal at the site as well as to revisit areas 

 within the site and at the reference areas that had showed evidence of disturbance based on results from the last survey in June 1991. 



In June 1991, the monitoring survey at WLIS showed high sediment oxygen demand and a high sulfide content at some 

 monitoring stations on disposal mounds "A" and "D" where dredged material has been released during the 1989/1990 disposal season. 

 The survey also indicated that reference area WLIS-REF may contain historical dredged material and that 2000S had experienced 

 frequent physical disturbance. In addition, 2000S contained patchy distributions of elevated polycyclic aromatic hydrocarbons (PAH's). 

 Recognizing that it is difficult to find areas of Western Long Island Sound that do not show some impact from humane activity, it was still 

 determined that a search for more suitable references should be conducted. 



The July 1992 monitoring survey at WLIS addressed these two concerns as well as determined the topography, areal extent , 

 and recolonization status of the active mound WLIS "F". Survey methods at the WLIS "F" mound included bathymetry and REMOTS 

 sediment-profile photography. The bathymetric survey at WLIS "F" showed a mound approximately 200m in diameter and 1.9m in 

 height. The thin layer of dredged material detected by REMOTS was within a circular area 350m in diameter. The WLIS "F" mound had 

 recolonized rapidly with deep apparent redox potential discontinuity (RPD) values and Stage III infauna at the apex of the mound. 



The benthic habitat and sediment toxicity studies for selected stations at mounds "A" and "D" included REMOTS sediment-profile 

 photography and a 10-day amphipod bioassay. The REMOTS data at mound "A" and "D" indicated only modest improvement in habitat 

 quality since 1991. However, the 10-day bioassay test showed no statistical difference between these sediments and those at the 

 reference areas or control sediments. No remedial action is warranted based on these observations, though periodic follow-up 

 monitoring should continue. 



The search for reference areas to replace WLIS-REF and 2000S included a cross-shaped bathymetric survey of areas named 

 SOUTH and EAST to characterize the topography of these proposed areas and a 13-station cross grid REMOTS survey of each proposed 

 site. These areas were also sampled for metals, PAH's, grain size and total organic carbon. The results showed that SOUTH was a 

 suitable replacement for 2000S. Area EAST was located too close to an historic dredged material disposal site and showed some of the 

 same characteristics at WLIS-REF. 



14. SUBJECT TERMS 



Bioaccumulation REMOTS WLIS DAMOS PAH's RPD bathymetric 



15. NUMBER OF PAGES 

 20_ 



16. PRICE CODE 



17. SECURITY CLASSIFICATION OF REPORT 18. SECURITY CLASSIFICATION OF THIS 19. SECURITY CLASSIFICATION OF 



Unclassified page abstract 



20. LIMITATION OF ABSTRACT 



