REPORT DOCUMENTATION PAGE 



form A aa m ma 



OMB NO. 0704-0 tit 



4. TTTU ANO SURTTTLE 



Monitoring Cruise at the Western Long Island Sound 

 Disposal Site, July 1988 



6. AUTHOR'S) 



7. PERFORMING ORGANIZATION NAMS(S) ANO AOORESS(ES) 



Science Applications International Corporation 

 221 Third Street 

 Newport, RI 02840 



9. SPONSORING. MONITORING AGENCY NAMEISI ANO AOORESS(ES) 



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

 424 Trapelo Road 

 Waltham, MA 02254-9149 



A. PERFORMING ORGANIZATION 

 REPORT NUMBER 



SAIC-88/7547 & C74 



10. SPONSORING/ MONITORING 

 AGENCY REPORT NUMUR 



DAMOS Contribution No. 76 



11. 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. 



Ub. D ISTRIBUTIO N COOE 



DOCUMENT v 



drAKi 



WbodQ!:ri:Ccc:ncjrcphio 



1 J. ABSTRACT (MtMimum iQO worm \ J 



Institution / 



From 19 to 22 July 1988, field operations were conducted at WLIS^Hq^ provide information on the Ja(e of 

 recently-disposed dredged material and assess the environmental effects of past and receat^djsposal operation&>-''The field 

 operations consisted of a precision bathymetry survey, REMOTS* sediment-profile photography, measurements of near-bottom 

 and near-surface dissolved oxygen concentrations, and determination of the vertical profiles of temperature and salinity at selected 

 stations. 



Both the precision bathymetric and REMOTS* surveys at WLIS indicated an accumulation of recently-deposited 

 dredged material at the "B" mound. The deposited material occurred around the buoy in a broad, circular mound up to 2.0 

 m thick having a radius of about 100 m. The minimum depths of the "C" and "A" disposal mounds remained unchanged since 

 the previous bathymetric survey in November 1987. Relict dredged material was visible in the REMOTS* photos from stations 

 at and in the vicinity of these two mounds, consistent with the results of the November 1987 REMOTS* survey. 



The lack of significant differences between reference and on-site stations in such REMOTS* parameters as RPD 

 depths, percentage of Stage III organisms, and OSI values suggested that any seafloor disturbance related to dredged material 

 disposal at the site was minimal. This disturbance primarily was physical in nature and limited to the immediate vicinity of the 

 active "B" disposal mound. The July 1988 results further suggested a continuation of the trend of improving benthic habitat 

 conditions at the site since it was severely stressed by the passage of Hurricane Gloria in September 1985 and by region-wide 

 near-bottom hypoxia in August 1986. This trend was marked by continued colonization of the site by Stage III taxa. 



14. SUBJECT TERMS 



Western Long Island Sound disposal site REMOTS dissolved oxygen 



dredged material sediment profile photography 



sediments bathymetry 



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18. SECURITY CLASSIFICATION 

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19. 



SECURITY CLASSIFICATION 

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20. LIMITATION OP AISTRACT 



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