REPORT DOCUMENTATION PAGE 



Form AoorovM 



omb mo. 07o*-oiaa 



9»bwi— . — «—"« w» «"» ! "'" '"■*"* ?T7" m _ ouran, t0 «v w»~jron "••oomntn ttmn. Oir«rerm lor mtoniutio* Ocunmmi ma uon 1 2 u . 



1. AGENCY USE ONLY (IHW o/*n«J 



2. REPORT DATE 

 January 1 995 



3. REPORT TYPE ANO OATES COVERED 



Final report 



4. TITLE ANO SUBTniE 



Monitoring Cruise at the New London Disposal Site, June - July 1990 



6. AUTHOR(S) 



J. D. Germano, J. Parker, and F. Craig Eller 



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



Science Applications International Corporation 

 221 Third Street 

 Newport, PJ 02840 



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



US Army Corps of Engineers - New England Division 

 424 Trapelo Road 

 Waltham, MA 02254-9149 



S. FUNOING NUMBERS 



3. PERFORMING ORGANIZATION 

 REPORT NUMBER 



SAIC-90/7599&C93 



10. SPONSORING/ MONITORING 

 AGENCY REPORT NUMBER 



DAMOS Contribution No. 93 



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 



1 3 ABSTRACT IMMifwn f.00 vnqrat) 



The objectives of the 1990 monitoring cruise at the New London Disposal Site were 1) to delineate the extent 



and topography of dredged material deposited since the August 1988 survey, 2) to determine mound stability, and 3) to 



assess near-bottom dissolved oxygen concentrations relative to REMOTS benthic analyses. Sampling was 



concentrated at two regions of recent disposal activity. The first location, designated NL-TR, was a region where 



sediments unsuitable for unconfined open water disposal were covered with a cap of clean material during early 1989. 



The second disposal location, identified as NL-88, was immediately adjacent (150 m west) to the former active mound 



listed as NL-85 in the July-August 1 988 survey. 



The bathymetric survey revealed that 46,700 m 3 of new sediment had accumulated in the vicinity of the NL-TR 

 capped mound since the July- August 1988 survey. The radius of dredged sediment deposited at NL-TR was approximately 

 550 x 400 m, and benthic recolonization was largely as anticipated, indicating a healthy recovery well within expected 

 recolonization rates. A comparison of precapping and postcap bathymetry indicated less than 50 cm of cap material on 

 three of the six disposal points designated for the 1988 capping operation. However, it is believed that consolidation 

 of the underlying dredged material may have contributed to the apparent diminished cap thickness. As a precaution, 

 future disposal operations should be directed to these three capping points. 



The bathymetric survey also indicated an accumulation of an additional 11,560 m 3 of material in the southern 

 portion of the disposal site at disposal mounds NL-85 and NL-88. The REMOTS survey at NL-85 found that dredged 

 material was distributed across the mound and that benthic recolonization was substantially as predicted fSUape TT h Tm 



SUBJECT TERMS 



NLON 



dredged material 



sediments 



bathymetry 



REMOTS 



sediment profile photography 



capping 

 disposal mound 



15. NUMBER OF PAGES 



72 



16. PRICE CODE 



SECURITY CLASSIFICATION 

 OF REPORT 



Unclassified 



SECURITY CLASSIFICATION 

 OF THIS PAGE 



19. SECURITY CLASSIFICATION 

 OF ABSTRACT 



20. LIMITATION OF ABSTRACT 



NSN 7540-OWSO-55GO 



itanaara i=orrn i9i (Rev Z-39) 

 » i mun o* amu ua. U9-K 

 3H02 



