reference site. The only exception of note was at 200S where the 

 amount of fine sand was 18%. 



The chemical data also reflected this uniformity along 

 the transects by showing rather small differences between 

 individual location replicates. The concentrations for the trace 

 metals were low throughout the area. COD and organics were 

 typical for natural bottom silt/clay. An exception was at 200SW, 

 where relatively high concentrations of oil and grease were 

 found, most likely from the presence of dredged material. The 

 results of the chemical analyses at a majority of the stations in 

 the disposal area are similar with those from natural bottom. 

 C:N ratios were mostly between 7 and 9 (typical of offshore 

 natural sediment). Mg:Ca ratios averaged between 4-6, indicating 

 relatively few shells. Dredged material may have influence at 

 400W; the Mg:Ca ratios here averaged about 1 (relatively high in 

 shells) and the C:N ratio averaged about 11 (typical of inshore 

 harbors and estuaries). The variation in Mg:Ca and Fe results at 

 400NE may be caused by local natural bottom conditions and not 

 dredged material. 



2.3 Vertical Profiles of Temperature and Salinity 



On each day of the period 21 May - 24 May 1985, 

 vertical profiles for temperature and salinity were measured at 

 the disposal buoy to determine the structure of the water column. 

 Figures 2-9 to 2-12 show the temperature and salinity data 

 collected each day. The temperature ranged from approximately 

 6°C at the bottom to 11°C at the surface with a thermocl'ne 

 present at about 10 meters by 23 May. Salinity ranged from 

 approximately 29.6 ppt at the surface to 32.2 ppt at the bottom. 

 Throughout the tidal cycle, little effect was seen on the shape 

 of the vertical profiles. Wind-driven water movement could 

 account for changes in salinity and temperature at the surface. 

 Certain vertical profiles are seen to contain fewer data points 

 than others. This was due to intermittent data signals being 

 received by the computer. Alternatively, data were recorded 

 manually at specified depths. 



2 . 4 Current Regime 



During the period 21 May to 11 June 1985, current 

 measurements were made at Rockland in order to deteirmine the 

 overall current regime of the area. A string of two General 

 Oceanics current meters at depths of 10 meters and 60 meters was 

 deployed about 3 00m SE of the disposal buoy. Due to a tape 

 malfunction, no data were collected by the 60 meter instrument. 

 Figure 2-13 presents the current speed and direction and 

 temperature data for the observation period. These data have 

 been 3-hour low pass filtered (3-HLP) to emphasize the tidal 

 components. 



