REPORT DOCUMENTATION PAGE 



Form Aoorowa 



omb no. 0704-oiaa 



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~r iuo*f«a if* ntwo for r^ii»wiwq •miructiom. mwom* muw oau umtw*. 



1 AGENCY USE ONLY (LMW OM#«J (2. «PORT OATE 



April 1990 



3. AEPORT TYPE AMO DATES COVfREO 

 Final Report 



4. imi ANO SU8T7TU 



Monitoring Cruise at the Central Long Island Sound 

 Disposal Site, July 1986 



6. AUTHOWS) 



S. FUNDING NUMBERS 



7. PERFORMING ORGANIZATION NAME(S) ANO XoORESsTeS) 



Science Applications International Corporation 

 221 Third Street 

 Newport, RI 02840 



8. PERFORMING ORGANIZATION 

 REPORT NUMBER 



SAIC-87/7514 & C63 



9. SPONSORING^ MONITORING AGENCY NAME(S) ANO AOORESS(ES) 



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

 424 Trapelo Road 

 Waltham, MA 02254-9149 



10. SPONSORING' MONITORING 

 AGENCY REPORT NUMBER 



DAMOS Contribution No. 63 



11. SUPPLEMENTARY NOTES 



Available from DAMOS Program Manager, Regulatory Division 

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



LIBRARY 



Woods Hole Oceanographic J 



12b. drsTRisurtON CODE / 



12*. DISTRIBUTION / AVAILABILITY STATEMENT 



Approved for public release; distribution unlimited. 



1]. ABSTRACT (M*Mimum *00 warm) 



Field operations were conducted at CLIS from 15 July to 7 August 1986 to provide information related to the effects of 

 recent dredged material disposal operations and assess the effectiveness of management controls. The only significant addition 

 to the bathymetnc features at CLIS was the development of the new CLIS-86 disposal mound, which had a maximum thickness 

 of 2 meters and a radius of about 250 meters as detected with acoustic methods. The REMOTS* results showed that recently- 

 deposited dredged material covered an area with a north-south radius of about 350 to 400 meters and an east-west radius in 

 eXC ^,^.^L metCIS - ** estimated 131 ' 920 m of disposed material was detected on the bottom using precision bathymetry 

 and REMOTS* photography, compared to a scow log volume estimate of 164,045 m 3 . No evidence of significant changes in 

 topography at other mounds was detected. 6 



None of the sediment chemistry results exceeded NERBC 'Moderate' upper limits except for Hg in the Norwalk Center 

 sample, which was at 'High' levels. Notably, the mounds that have been capped (CS-1, CS-2, STNH-S and STNH-N) almost 

 all showed relatively low (i.e., 'Low 1 ) contaminant concentrations. The levels of most of the parameters measured were either 

 not different or significantly lower than reference levels. This suggests that the caps have been effective in isolating or at least 

 diluting contaminants which might have been elevated in the capped dredged material.Sediment contamination levels for several 

 parameters were significantly elevated compared to reference levels at the FVP, MQR, CLIS-86, NH-74 and Norwalk disposal 

 mounds. This reflects the fact that contaminants were elevated in the dredged material deposited at these mounds. 



~ OT The . resuIts of the benthic community analysis generally confirmed the REMOTS* infaunal successional designations and 

 OSI rankings of the various mounds. The new CLIS reference station, STNH-N mound, and FVP mound were essentially 

 similar in terms of mean OSI rank and species richness, while the MQR mound had a significantly lower mean OSI and species 

 richness. *^ 



SUEflfCT iERMS Dredged material mounds Sediment chemical analysis 



Central Long Island Sound disposal site Benthic recolonization stages Body burden analysis 



REMOTS Precision bathymetric surveys Benthic community analysi " 



Sediment profile photography RPD depths Side-scan surveys 



IS. NUMBER OF PAGES 



218 



IB. PRICE COOE 



17. SECURITY CLASSIFICATION 

 OP Rf PORT 

 Unclassified 



18. SECURITY CLASSIFICATION 

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19. 



SECURITY CLASSIFICATION 

 OP ABSTRACT 



20. LIMITATION OF ABSTRACT 



NSN /SAO-OWaO-SSOO 



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