J 



ROCKLAND 



Background 



The Rockland disposal site 1s located in the center of West Penobscot 

 Bay three and one-half miles from the Rockland breakwater and three miles 



from North Haven Island (Fig. A-l). 



The site was first used in October 1973-February 1974 for disposal 

 of 68,850 cubic meters of material from Rockland Harbor. Disposal was at 

 a buoy at 44° 07. 5N and 69° 00. 4W. Kyte (1974) studied the area before 

 and immediately after its use. He found that the natural bo'-tom was co- 

 hesive clay and silt and that the spoil was mostly clay with less organic 

 matter and more chromium than the natural sediments. Some "odoriferous 

 black organic silt" from the inner harbor was also sampled. Kyte con- 

 cluded that "point dumping" had been successful since spoil formed a pile 

 on the floor and sides of the deep hole running through the site and 

 extended less than 450 meters north - south. 



Bathymetry 



Two bathymetric surveys of the Rockland disposal site have been made. 

 Navigation control for these surveys was provided by trisponder stations 

 located at Deadmans Point and Owls Head Light. The first survey on 11 

 December, 1977 (Figures A-2 (a-f ) covered a ha 1 f mile square designated on 

 the chart as the disposal site. The second survey on 12 May, 1978 (Figures 

 A-3 (a-g) was expanded 400 meters north and 200 meters east to provide 

 better definition of the depression through the site. 



