analysis as well as providing real-time navigation. Positions were 

 determined to an accuracy of 3 meters from ranges provided by a Del 

 Norte Trisponder System. For the present survey, shore stations 

 were established in Connecticut at known benchmarks at Greenwich 

 Point and the Norwalk electric-generating facility (SAIC, In prep.) . 

 A detailed description of the navigation system and its operation 

 can be found in DAMOS Contribution #60 (SAIC, 1989) . 



The depth was determined to a resolution of 3.0 cm (0.1 

 feet) using an Odom DF3200 Echotrac® Survey Recorder with a 

 narrow-beam 200 kHz transducer. The speed of sound was determined 

 from the water temperature and salinity data measured by an Applied 

 Microsystems® CTD/DO probe (see Section 2.3 below). The speed of 

 sound and the transducer depth were entered into the fathometer to 

 adjust the depth values being transmitted to the computer. 



The bathymetric survey was conducted at WLIS on 20 July 

 1987. Thirty-three lanes were run east and west at a 25 meter lane 

 spacing over an 800 by 800 meter survey grid centered approximately 

 at the WLIS "A" mound (Figure 1-1) . The same grid and lane spacing 

 was used as in the previous bathymetric survey of the site in 

 November 1987. During analysis, raw bathymetric data were 

 standardized to Mean Low Water by correcting for changes in tidal 

 height during the survey. A detailed discussion of the bathymetric 

 analysis technigue is given in DAMOS Contribution #60 (SAIC, 1989) . 



2.2 REMOTS® Sediment-Profile Photography 



REMOTS® photography was used to detect the distribution 

 of thin (1-20 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® image acguisition, analysis, and interpretative rationale 

 is given in DAMOS Contribution #60 (SAIC, 1989) . 



The REMOTS® stations occupied at WLIS on 21 and 22 July 

 1988 were the same ones occupied during the last survey performed 

 in November 1987. Three replicate photos were obtained at each 

 station in a 7 x 9 grid with 200 m spacing, centered slightly north 

 of the "A" disposal mound (Figure 2-1) . In addition, thirteen 

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

 m apart, were occupied at each of three reference sites to allow 

 comparisons between ambient and on-site conditions. These reference 

 sites were located 2000 m west (2000W) , 2000 m south (2000S) , and 

 2200 m northeast (WLIS-REF) of station 3-E near the center of the 

 REMOTS® grid (Figure 2-1) . 



