REPORT DOCUMENTATION PAGE 



Form approved 

 OMB No. 0704-0188 



Public reporting concern (or 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 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 



October 1995 



3. REPORT TYPE AND DATES COVERED 



Final report 



TITLE AND SUBTITLE 



Monitoring Cruise at the Centeral Long Island Sound Disposal Site, June 1991 



5. FUNDING NUMBERS 



6. AUTHOR(S) 



M. Baker Wiley & 

 J. Charles 



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



Science Applications International Corporation 

 221 Thrid Street 

 Newport, Rl 02840 



8. PERFORMING ORGANIZATION REPORT 

 NUMBER 



SAIC-92/7621&C100 



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



US Army Corps of Engineers-New England Division 

 424 Trapelo Road 

 Waltham, MA 02254-9149 



10. SPONSORING/ MONITORING AGENCY 

 REPORT NUMBER 



DAMOS Contribution 

 Number 97 



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 (MAXIMUM 200 WORDS) 



Science Applications International Corporation (SAIC) conducted a monitoring survey at the Central Long Island Sound (CLIS) 

 Disposal Site from 18 to 23 JUNE 1991 as part of the DAMOS (Disposal Area Monitoring System) Program. The objectives of the June 

 1991 field operations were to map the distribution and thickness of the dredged material in the areas that received project materials after the 

 1990 DAMOS survey (CLIS-90 and CS-90-1 ) and to evaluate the status of inactive mounds: MQR, NHAV-74, CLIS-88, CLIS-89, CS-1 and 

 FVP. Surveying and monitoring techniques included precision bathymetry, REMOTS sediment-profile photography, CTD and dissolved 

 oxygen information, and sediment grab samples. 



In September 1990, the CLIS disposal buoy was deployed at 41°9.212'N, 72°53.25'W. Barges released approximately 59,000 m3 

 of dredged material at this location between September 1990 and May 1991. It was predicted that a new disposal mound would form at this 

 location. During the 1989/1990 disposal season, barges released 8,730 m3 of additional dredged material at CS-90-1 to increase cap 

 thickness. 



The precision bathymetric survey detected a small, newly formed disposal mound at the CLIS-90 buoy location. The addition of 



8,730 m3 of material to the CS-90-1 was detectable in the bathymetric survey as two 20cm thick areas of accumulation. REMOTS 

 sediment-profile photography detected the presence of dredged material at all stations within the survey area. "Fresh" or recent dredged 

 material, identified by sedimentary fabric and shallow apparent RPD (Redox Potential) depths, was several hundred meters away from the 

 active mounds. The limit of the dredged material mound, as mapped acoustically, was within a 100 m radius of the CLIS-90 buoy location 



Benthic recolonization was deterimed from analysis of REMOTS photographs obtained at CLIS and at three outlying reference 

 areas. Recolonization predictions from the DAMOS tiered monitoring and management protocol were that the active mounds should be in a 

 Stage I sere while Stage III sere should colonize the inactive mounds: MQR, NHAV-74, CLIS-88, CLIS-89.CS-1, and FVP. The 1991 

 REMOTS data supported these predictions. 



Water column profiles of temperature, salinity, sigma-t, and dissolved oxygen were determined on June 18th at the CLIS-90 buoy 

 and three reference areas. The water column at these four sampling stations was stratified with respect to both temperature and salinity. 

 Dissolved oxygen (DO) concentrations below the pycnocline were 6 to 7 ppm, 2 to 3 ppm lower than near surface values. DO values were 

 similar between the CLIS-90 buoy location and the three reference locations. 



Sediment samples collected from the CLIS reference areas contained metals in similar low concentrations as measured during 

 previous CLIS surveys. Polyaromactic hydrocarbons (PAH's) were also analyzed to provide a baseline for future sampling. PAH's were 

 measured at all three reference areas in concentrations generally within ranges present in regional Long Island Sound. 



14. SUBJECT TERMS 



SAIC CLIS DAMOS surveying bathymetry REMOTS 

 disposal mound RPD sediment samples CTD DO 



15. NUMBER OF PAGES 



53. 



16. PRICE CODE 



17. SECURITY CLASSIFICATION OF REPORT 



Unclassified 



18. SECURITY CLASSIFICATION OF THIS 

 PAGE 



19. SECURITY CLASSIFICATION OF 

 ABSTRACT 



20. LIMITATION OF ABSTRACT 



