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1. AGENCY USC ONLY llun mm) 1 2. REPORT OATE 



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j. «port type 



Final Rmrvrt 



ANO OATES COVERED 



4. mu ano subtitle 



Monitoring Cruise at the New London Disposal Site 

 June 1991 



«. AUTHOWS) 



Science Applications International Corporation 



5. FUNOING NUMBERS 



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



Science Applications International Corporation 

 221 Third Street 

 Newport, RI 02840 



L PERFORMING 0RGANUAT10N 

 REPORT NUMtER 



SAIC-92/7622&C101 



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 



tO. SPONSORING/ MONITORING 

 AGENCY REPORT NUMBER 



DAMOS Contribution No. 96 



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 



12b. DISTRIBUTION COOE 



13. ABSTRACT IMwimum tQQ wares) 



The objectives of the monitoring cruise at the New London Disposal Site (NLON) were to 1) delineate the footprint and characterize 

 the topography of the dredged sediment deposited in the vicinity of the NL-TR mound during 1990-1991; 2) assess the benthic recolonization 

 rate at the active disposal site and monitor the successional status at the inactive NL-88 mound; 3) measure near-bottom and surface dissolved 

 oxygen (DO) concentrations at the active disposal site and reference areas and; 4) collect sediment samples at the three reference areas to provide 

 information on percent total organic carbon (TOC), grain size, and levels of polynuclear aromatic hydrocarbons (PAHs), cadmium, lead, and 

 zinc. During the 1990-1991 disposal season, 31,475 m 3 of dredged material was disposed in the vicinity of the NL-TR mound at the 1990-1991 

 buoy location, 41°16.428' N and 72°04.333' W. 



A comparison of the June 199 1 and July 1990 bathymetric surveys showed an increase in height of 2.4 m at NL-TR Also apparent 

 was a smaller mound that developed around the buoy and was adjacent to the NL-TR mound. This mound was 0.6 m in height and 

 approximately 100 m in diameter. The combined radii of these two mounds was about 150 m 



Information obtained from the REMOTS® survey indicated the presence of recently deposited dredged material within 200 m north, 

 400 m west, and 300 m south of the disposal site center. The majority of disposal site and reference area stations were dominated by Stage II, 

 Stage II on III, or Stage III assemblages. Stage II represents a transitional sere between Stages I and III and is associated with recovery of a 

 disturbed benthic habitat Organism-Sediment Indices for both the disposal site and reference area stations were variable and indicative of a 

 patchy benthic environment 



Results of the metal and PAH analyses indicate relatively low concentrations for the reference areas and no immediate need for 

 further testing beyond the collection of baseline information. Near-bottom dissolved oxygen concentrations were very similar at the reference 

 areas and disposal site, and results indicated a well-oxygenated water column throughout the surveyed area. 



14. SUBJECT TERMS 



dredged material 

 monitoring 



capping 

 ocean disposal 



contaminated sediment 

 sediment chemistry 



15. NUMBER OF PAGES 

 56 



It. PRICE COOE 



17. SECURITY CLASSIFICATION 

 OP REPORT 



Unclassified 



SECURITY CLASSIFICATION 

 OP THIS PAGE 



SECURITY CLASSIFICATION 

 OP ABSTRACT 



20. LIMITATION OF ABSTRACT 



MSN 7S40-OWSO-5SOO 



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