April and May of 1996. An additional 5,240 m^ of material generated by two small 

 dredging projects in Manhasset Bay, New York, was also incorporated into the H mound 

 during the spring of 1996. 



The G mound at WLIS was formed during the 1994-95 disposal season. In 

 September 1994, the WDA buoy was placed at 40°59.158' N, 73°29.020' W, 210 m west 

 of the F mound (Figure 1-4; Appendix A, Table 1-1). Disposal logs indicate a total of 

 52,500 m^ of dredged material was deposited at the WDA 94 buoy from 19 January to 31 

 May 1995. An estimated barge volume of 49,500 m^ of material was dredged from 

 Norwalk Cove; Saugatuck and Darien Rivers; and Greenwich, Stamford, and Sheffield 

 Island Harbors in Connecticut. In addition, an estimated 3,000 m^ of material was 

 deposited from dredging operations at the Tom's Point Marina, Manhasset Bay, New 

 York. 



The F mound is the result of modest dredged material deposition at WLIS over a 

 three-year period. The WDA buoy was positioned in nearly the same location during the 

 1991-92, 1992-93, and 1993-94 disposal seasons (Figure 1-4; Appendix A, Table 1-1). A 

 total of 80,300 m^ of dredged material was deposited at the DAMOS buoy positions from 

 September 1991 through May of 1994. During the 1991-92 disposal season a total 

 estimated barge volume of 38,700 m^ of dredged material (13,300 m^ from New York 

 projects) was disposed at 40°59.162' N, 73°28.880' W. The resulting sediment mound 

 was detected by the July 1992 bathymetric survey at WLIS (Figure 1-5). 



Disposal over the F mound continued during the 1992-93 disposal season with an 

 additional 21,600 m^ of sediment being incorporated into the bottom feature. 

 Approximately 8,260 m^ of dredged material that was deposited at WLIS originated from 

 small projects in New York waters. The 1993-94 disposal season represented the final 

 year of disposal over the F mound. A total of 20,000 m^ of material generated by five 

 small dredging projects was disposed at WLIS during the 1993-94 season. The majority of 

 the new material, 13,800 m^ originated from dredging operations along the Connecticut 

 coast. The remaining 6,200 m^ was dredged from Glen Cove Creek and New Rochelle 

 Harbor, New York. 



Relative to present disposal techniques, past dredged material deposition operations 

 (pre- 1970s) at the historic disposal sites within western Long Island Sound were not as 

 tightly controlled. This has led to a broad distribution of historic dredged material on the 

 seafloor surrounding WLIS (Eller and Williams 1996). As a result, the detection of 

 dredged material within the WLIS reference areas has become a common occurrence in 

 recent years. Reference area data are collected to provide a baseline against which results 

 from the dredged material mounds are compared. However, the lack of ambient western 



Monitoring Cruise at the Western Long Island Sound Disposal Site, July 1996 



