2.2 REMOTS® Sediment-Profile Photography 



REMOTS® sediment-profile photographic surveys of the New London Disposal Site 

 have been carried out since June 1984. REMOTS® photography has been used to detect and 

 map the distribution of thin (up to 20 cm) dredged material layers, map benthic disturbance 

 gradients, and monitor the process of infaunal recolonization on and adjacent to the disposal 

 mounds. A detailed description of REMOTS® photograph acquisition, analysis, and 

 interpretative rationale is given in DAMOS Contribution No. 60 (SAIC 1989), and quality 

 assurance and quality control procedures are reviewed in the QA/QC plan for the DAMOS 

 Program (SAIC 1990b). 



The REMOTS® stations occupied during the present survey were centered at the NL- 

 TR buoy position described above. Sampling was conducted along a star-shaped grid 

 consisting of 25 stations arrayed at 100 m intervals around a central station (Figures 1-2 and 

 2-1). In addition to the center station, 4 stations each were positioned to the north, south, 

 east, and west, and 2 stations each in the northeast, northwest, southeast, and southwest 

 directions. At least three replicate REMOTS® photographs were obtained at each station. 

 Individual stations were named on the basis of distance and direction from a central station 

 (i.e., Station 300S was 300 meters south of Station CTR; Figure 2-1). 



Thirteen REMOTS® stations, arranged in a cross-shaped pattern and spaced 100 m 

 apart, were also occupied at four additional locations (Figure 2-1). Three of these areas 

 were reference stations, selected to allow comparisons between ambient and on-site 

 conditions. The fourth was centered on the NL-85 mound (41° 16.080' N and 

 72°04.230' W, Figure 1-2). Reference stations were positioned at 41°16.200' N and 

 72°06.000' W (W-REF), 41° 16.680' N and 72°03.400' W (NE-REF), and 41° 16.660' N 

 and 72°02.000' W (NLON-REF; Figure 1-1). The results of the present survey were 

 compared with the July- August 1988 survey to define the extent of dredged material 

 deposited during the previous two years' disposal activities and to document any changes in 

 existing mound conditions. 



2.3 CTD and Dissolved Oxygen Sampling 



Depth gradients of temperature and salinity were sampled at selected REMOTS® 

 stations using a Conductivity, Temperature, and Depth (CTD) probe (Applied Microsystems 

 Model STD-12). The operation of this instrument is described in DAMOS Contribution 

 No. 66 (SAIC 1990c). A Yellow Springs Instruments (YSI) dissolved oxygen probe with 

 stirrer was mounted on the CTD and operated with the YSI Model 58 dissolved oxygen 

 meter. The calibration and operation of the YSI oxygen probe are described in YSI (1982). 



At selected REMOTS® stations, dissolved oxygen (DO) was measured by titration of 

 a water sample. In these cases, a Niskin bottle was used to obtain water samples from 



Monitoring Cruise at the New London Disposal Site, June- July 1990 



