the process of infaunal recolonization on, and adjacent to, disposal mounds. Specific 

 measurement/observational techniques for determining REMOTS® parameters include a 

 visual estimate of the sediment grain size major mode and range, prism penetration depth, 

 surface boundary roughness, presence/absence and size of mud clasts, apparent redox 

 potential discontinuity (RPD) depth, apparent presence/absence of sedimentary methane, 

 estimate of infaunal successional stage, and calculation of the REMOTS® Organism-Sediment 

 Index (OSI). A detailed description of REMOTS® photograph acquisition, analysis, and 

 interpretative rationale is stated in DAMOS Contribution No. 60 (SAIC 1989). Quality 

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

 Program (SAIC 1990b). 



REMOTS® stations occupied during the present survey were radially distributed 

 around the disposal site center (41°16.428' N, 72°04.333' W; Figure 2-1). Triplicate 

 photographs were obtained on 24, 26, and 27 June 1991 for each of the 25 stations. Stations 

 were spaced 100 m apart and extended 400 m to the north, south, east, and west and 200 m 

 to the northwest, northeast, southwest, and southeast of the central station. 



In addition, thirteen REMOTS® stations, arranged in a cross-shaped pattern and 

 spaced 100 m apart, were established at each of the reference areas to allow comparisons 

 between the disposal site mound and the ambient bottom. Photographs were obtained at all 

 reference area stations with the exception of WREF 200N. A fourth 13-station cross-shaped 

 grid was centered on the inactive NL-88 mound (41° 16. 100' N, 72°04.350' W), 700 m 

 south of the NL-TR region. Results of REMOTS® photographs from the NL-88 mound were 

 used to provide a rapid field evaluation of the colonization status of this inactive mound. 

 Disposal at NL-88 occurred 25 January to 10 March 1989, and October 1989 to February 

 1990 (SAIC 1993). Reference area station locations were the same as those occupied in 

 June-July 1990; WREF (41° 16.200' N, 72°06.000' W), NE-REF (41° 16.680' N, 

 72°03.400' W), and NLON-REF (41° 16.660' N, 72°02.000' W). 



2.3 Sediment Sampling and Analysis 



Sediment samples were collected from the center of the reference areas using a 

 0. 1 m 2 teflon-lined Van Veen grab sampler. Three samples were collected for analysis at 

 each reference area with each sample originating from a separate grab. Subsamples from 

 each grab were obtained using a 10 cm polycarbonate plastic core liner (6.5 cm ID). Cores 

 (0-10 cm) were composited to provide sufficient sediment to fill precleaned I-Chem® 250 ml 

 glass jars for chemistry analyses (metals and PAHs). Sediments for grain size and TOC 

 were placed in plastic bags. Samples were kept cold (approximately 4° C) and delivered to 

 the NED lab. The triplicate samples for each reference area were analyzed for TOC, PAHs, 

 Cd, Pb, and Zn. Grain size analyses were not run in triplicate but were combined for each 

 reference area at the NED laboratory. 



Monitoring Cruise at the New London Disposal Site, June 1991 



