REPORT DOCUMENTATION PAGE 



form a o ort mu 

 OMB No. 07044) tU 



1. AG4NCY USE ONLT il««v* o**n*> | 2. DEPORT DATE 



I April 1991 



j. «port type and dates covered 



Final Report 



A, TTTU ANO SUSTTTLt 



Monitoring Cruise at the Saco Bay Disposal Site, 

 May 1990 



fc. AUTHORtS) 



S. FUNDING NUMBERS 



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



Science Applications International Corporation 

 221 Third Street 

 Newport, RI 02840 



g. PERFORMING ORGANIZATION 

 REPORT NUMBER 



SAIC-90/7587 & C88 



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 NUMUI 



DAMOS Contribution No. 81 



11. SUPPLEMENTARY NOTES 



Available from DAMOS Program Manager, Regulatory Division 

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



U*. DISTRIBUTION/ AVAILABILITY STATEMENT 



Approved for public release; distribution unlimited. 



Utt. DISTRIBUTION CODE 



1J. ABSTRACT [««imum 1 00 worm; 



The Saco Bay Disposal Site (SBDS) was approved for one-time use by two projects at the nearby Biddeford Pool. 

 From 9 January to 11 May 1989, approximately 34,800 cubic meters of dredged sediment were disposed at the site. The objectives 

 of this monitoring cruise at SBDS were to measure the areal extent of dredged material and to assess the status of benthic 

 recolonization on and adjacent to the disposal site. 



The acoustic survey did not show a distinct mound at the buoy position, although several small topographic features 

 (less than 1 m high) were noted in the vicinity. Due to the lack of a pre-disposal baseline survey and the lateral distribution of 

 dredged material, bathymetry proved inadequate for detecting the areal extent of most dredged sediment at SBDS. REMOTS® 

 sampling found dredged material at most stations in the central and southwestern portions of the survey grid. However, the full 

 extent of dredged sediments was not measured at SBDS, extending beyond the southern and western stations of the survey grid. 

 Calculations of dredged sediment volume based on REMOTS® photographs indicated that at least 38% of the reported scow 

 deposition at SBDS was encompassed by the REMOTS® survey. The actual amount was probably much larger, because almost 

 all REMOTS® photographs at stations with dredged material present showed deposited sediment equal to or greater than the 

 penetration depth of the camera. Although the entire extent of dredged material at SBDS was not measured, it is likely that 

 most sediment is confined to a relatively small region extending south and west of the disposal site center. 



Benthic recolonization at SBDS was largely as expected, with the exception that Stage II taxa were not observed on the 

 disposal site stations. The presence of Stage I on III taxa at many stations on dredged material indicated that indigenous infauna 

 were recolonizing the affected area. Given more time for the further establishment of Stage ID taxa, it is expected that the 

 infaunal community will return to an assemblage similar to the reference areas. 



14. SUBJECT TERMS 

 Saco Bay 



" dredged material 



sediments 



REMOTS 



sediment profile photography 



bathymetry 



IS. NUMBER OF PAGES 



33 



IB. PRICE COOE 



17. SECURITY CLASSiFICATlON 

 OF REPORT 



Unclassified 



18. SECURITY CLASSIFICATION 

 OF THIS PAGE 



19. SECURITY CLASSIFICATION 



OF ABSTRACT 



lO. LIMITATION OF ABSTRACT 



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