127 



Figure 1. — Known Dumping Sites Off U.S. Coasts (22, 66) 



Table 2. — Ocean Dumping: Types and Amounts, 1968 (66) 

 (In tons) 



Dredge spoils account for 80 percent by 

 weight of all ocean dumping. The Corps of 

 Engineers estimates that about 34 percent (13 

 million tons) of this material is jJoUuted. 

 Contamination occurs from deposition of pol- 

 lutants from industrial, municipal, agricul- 

 tural, and other sources on the bottom of 

 water bodies. The quantities of polluted 

 dredge sjjoils are shown in Table 3. 



Polluted dredge spoils vary at every loca- 

 tion according to the land-based sources of 

 pollution. Detailed quantitative analyses of 

 the pollutants in dredge spoils in the coastal 



Table S.— Estimated Polluted Dredge Spoils (22) 



1 Estimates of polluted dredge spoils consider chlorine demand; 

 BOD; COD; volatile solids; oil and grease; concentrations of phos- 

 phorous, nitrogen, and iron; silica content; and color and odor of the 

 spoils. 



