REPORT DOCUMENTATION PAGE 



Form approved 

 OMB No. 0704-0188 



Public reporting concern for the collection of information is estimated to average 1 hour per response including the time for reviewing Instructions, searching existing 

 data sources, gathering and measuring the data needed and correcting and reviewing the collection of information. Send comments regarding this burden estimate or 

 any other aspect of this collection of information including suggestions for reducing this burden to Washington Headquarters Services, Directorate for information 

 Observations and Records, 1216 Jefferson Davis Highway, Suite 1204, Arlington VA 22202-4302 and to the Office of Management and Support, Paperwork Reduction 

 Project (0704-0188), Washington, D.C. 20503. 



1. AGENCY USE ONLY (LEAVE BLANK) 



2. REPORT DATE 



January 1996 



3. REPORT TYPE AND DATES COVERED 



Final report 



4. TITLE AND SUBTITLE 



Monitoring Cruise at the Portland Disposal Site, July 1992 



5. FUNDING NUMBERS 



6. AUTHOR(S) 



M. B. Wiley 



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



Science Applications International Corporation 

 221 Thrid Street 

 Newport, Rl 02840 



8. PERFORMING ORGANIZATION REPORT 

 NUMBER 



SAIC-C110 



9. SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES) 



US Army Corps of Engineers-New England Division 

 424 Trapelo Road 

 Waltham, MA 02254-9149 



10. SPONSORING/ MONITORING AGENCY 

 REPORT NUMBER 



DAMOS Contribution 

 Number 108 



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 



13. ABSTRACT 



Between October 1991 and June 1992, a capping project was conducted at the Portland Disposal Site (PDS) as 

 part of the Disposal Area Monitoring System (DAMOS) Program. Fine-grained dredged material from the US Coast Guard 

 project in South Portland (13,270 m 3 ) was capped with cleaner fine-grained sediment from the same project (19,451 m 3 ), as 

 well as with sandy material from the Northeast Petroleum project (18,310 m 3 ) 



Science Applications International Corporation (SAIC) conducted a monitoring cruise at PDS in July 1992. The 

 survey was designed to map the areal extent of dredged material at the site, to determine the effectiveness of the capping 

 operation, and to obtain sediment chemistry data on the cap and at the reference areas. The field work included a 

 REMOTS® sediment-profile survey, a bathymetric survey, an acoustic sediment density study, and sediment sampling for 

 chemistry and grain size. 



Based on the REMOTS® survey, the areal extent of dredged material at PDS ranged from 200 m west of the 

 disposal buoy to 700 m southwest of the buoy location. The bathymetric survey, when compared to the previous 

 bathymetric survey in January 1989, showed accumulations up to 0.75 m thick within 200 m of the buoy. The comparison of 

 the 1989 and 1992 bathymetric surveys also indicated an area of accumulation 500 m south of the buoy. This corresponded 

 to the southernmost detection of dredged material from the REMOTS® survey in an area that received dredged material 

 after 1989. 



The acoustic sediment density survey showed that, in general, the coarser grained sediment was concentrated in 

 water depths shallower than 54 m, and the finer grained sediment was concentrated in the deeper areas. The acoustic data 

 were patchy and, after smoothing, precluded identification of the project cap material. The patchiness was attributed to both 

 the heterogeneity of dredged material and the rapidly changing slopes in the survey area. 



Sediment chemistry data from the surface of the cap showed that contaminant concentrations were within the 

 ranges measured at PDS reference areas, indicating that the cap was effectively isolating contaminants. Two stations, F7 

 and H5 near the location of a historical (1984) disposal buoy, showed elevated levels of several metals, though these levels 

 were similar to the cap material and much less than the contaminated material that was disposed, delete the following 

 [potentially attributed to the disposal of contaminated material at.] A comparison of the metal and polycyclic aromatic 

 hydrocarbon (PAH) baseline chemistry data from PDS reference areas and data collected by the National Oceanographic 

 and Atmospheric Administration (NOAA) National Status and Trends (NS&T) Program for the Gulf of Maine showed that the 

 PDS reference areas were well within the ambient values for metals and PAHs in the area (NOAA 1 991 ). 



14. SUBJECT TERMS 



DAMOS PDS REMOTS SAIC bathymetric 



15. number of pages 

 Ml. 



16. PRICE CODE 



17. SECURITY CLASSIFICATION OF REPORT 



Unclassified 



18. SECURITY CLASSIFICATION OF THIS 

 PAGE 



19. SECURITY CLASSIFICATION OF 

 ABSTRACT 



20. LIMITATION OF ABSTRACT 



