1.0 INTRODUCTION 



The Western Long Island Sound Disposal Site (WLIS) is located 2.7 nm north of 

 Lloyd Point, New York and 2.5 nm south of Long Neck Point, Connecticut, between the 

 Stamford and Eaton's Neck historic disposal grounds (Figure 1-1). Dredged material has 

 been deposited annually since disposal first began at the site in March 1982, resulting in the 

 formation of five dredged material disposal mounds (Figure 1-2). 



The disposal buoy was located approximately 250 m southeast of the "C" mound at 

 coordinates 40°59.333' N and 73°28.888' W during the 1990-1991 disposal period. 

 Reported volimie estimates indicated that 86,462 m^ of dredged material was disposed near 

 the buoy between November 7, 1990 and May 31, 1991. The resulting dredged material 

 moimd is referred to as WLIS "E". 



Field operations at WLIS were initiated on 15 June 1991 (two weeks after disposal 

 operations ceased) to provide information on the fate of recently disposed dredged material at 

 WLIS "E" and to assess the environmental effects of past and recent disposal operations. 

 Field operations included a bathymetric survey, REMOTS® sediment-profile photography, 

 near-bottom dissolved oxygen (DO) analyses, sediment metal and PAH chemistry, and grain 

 size sampling. The objectives for the 1991 monitoring cruise at WLIS were 



• to delineate the areal extent and topography of dredged material deposited 

 since the July 1990 survey and to determine the stability of disposal mounds 

 formed prior to the July 1990 survey; 



• to assess the extent of recolonization at the WLIS disposal mounds and 

 monitor the ambient benthic infaunal successional stages present within the 

 three reference areas; 



• to assess near-bottom dissolved oxygen concentrations and compare these to 

 the REMOTS® benthic analyses at and near the disposal site and at the three 

 reference areas; and 



• to provide additional sediment metal and PAH baselme information and grain 

 size distributions at each of three reference areas. 



The 1991 monitoring plan was designed to test the following predictions that are part 

 of the DAMOS tiered monitoring protocol (Germano et al. 1994): 



• Based on a disposal simulation model, the volume of sediments disposed at 

 WUS from November 1990 to May 1991 was predicted to form a mound with 

 a radius of approximately 200 m and height of 2.7 m. 



Monitoring Cruise at the Western Long Island Sound Disposal Site, June 1991 



