In September 1994, the CD A buoy was deployed over the historic CS-90-1 mound 

 at 41°09.343' N, 72°53.099' W, approximately 630 m northeast of the NHAV 93 mound 

 apex. The placement of a moderate-sized, capped mound in close proximity to the NHAV 

 93 mound complex began the formation of a second containment ring capable of 

 accommodating a future CAD mound project. In addition, the deposition of new material 

 over CS-90-1 was intended to cover the smaller CS-90-1 capped mound, further isolating 

 its UDM deposit and conserving the usable surface area of the CLIS seafloor. 



An estimated barge volume of 129,900 m 3 of UDM was released at the CDA buoy 

 from late November through mid-December 1994. Toward the end of UDM disposal 

 activity, the CDA buoy was struck by a disposal barge and dragged off-station. The buoy 

 was repositioned at 41°09.334' N, 72°53.084' W on 27 December 1994 before the start of 

 CDM deposition. During capping operations, the UDM deposit was covered to a thickness 

 of 0.5 to 1.0 m from January through May 1995 with an estimated volume of 161,000 m 3 

 of CDM. 



In 1983, the Field Verification Program (FVP) mound was formed in the 

 northeastern corner of CLIS as the subaqueous disposal component of a joint research 

 effort between the US Environmental Protection Agency (EPA) and US Army Corps of 

 Engineers, Waterways Experiment Station (WES). The two agencies were evaluating 

 upland containment, wetland creation, and subaqueous disposal alternatives for UDM 

 (Peddicord 1988). The FVP mound is a small mound composed of 55,000 m 3 of uncapped 

 UDM dredged from Black Rock Harbor in the spring of 1983 (Morton 1983). Since 1991, 

 FVP has displayed instability in the benthic infaunal population inhabiting the surface 

 sediments, suggesting an increase in environmental stress. 



Science Applications International Corporation (SAIC) conducted a monitoring 

 survey at CLIS from 27 August to 1 September 1995 as part of the DAMOS Program. 

 The field efforts were concentrated over the NHAV 93, CLIS 94, and FVP disposal 

 mounds, and consisted of bathymetric profiling, Remote Ecological Monitoring of the 

 Seafloor (REMOTS®), and geotechnical coring. Precision bathymetry and REMOTS® 

 technology are well-tested and highly regarded methods of investigating the properties and 

 processes of dredged material disposal within the DAMOS tiered monitoring protocols. 

 The use of geotechnical coring is not a routine monitoring approach but is used in the 

 special study of dredged material mounds to improve our understanding of the dynamics 

 and mass properties of these mounds. 



The DAMOS tiered monitoring protocols are based on the use of a control or 

 alternate condition to provide solid statistical testing and serve as a foundation for 

 experimental design (Germano et al. 1994). Three reference areas surrounding CLIS are 



Monitoring Cruise at the Central Long Island Sound Disposal Site, September 1995 



