18 



3.3 Sediment Density 



Surface density data ranged from 1.3 g-cc" 1 to 2.3 gcc 1 . The surface sediment 

 density data show high variability between data points (Figure 3-9). At REMOTS® stations 

 G8 and G9, where the median grain size mode was greater than 4 phi (silt/clay), the density 

 values range from 1.5 to 1.8 gcc 1 . The remaining REMOTS® stations surveyed in August 

 all had grain sizes of one to two phi (medium to fine sand) which should correspond to 

 densities of more than 1.9 gcc" 1 . The density data show values of 1.3 g-cc 1 and greater at 

 all the REMOTS® locations. The contour plot of the density data (Figure 3-10) shows areas 

 of relatively uniform density between 1.3 and 1.6 gcc 1 . Values greater than 1.6 g-cc 1 

 (Figure 3-11) are concentrated north of 41° 12.75' N. 



Subsurface sediment density at CSDS was collected at 15 cm intervals below the 

 surface. Data was collected for multiple intervals although attenuation and data degradation 

 prevented any realistic analysis on all but the initial layer. The contour plot of the density 

 values of the first layer (15 cm below the sediment water interface) shows an increase in 

 density at all points of the survey (Figure 3-12). 



Monitoring Cruise at the Cornfield Shoals Disposal Site, August 1992 



