59_ 



were comprised mainly of sand. Average sand fractions for these stations ranged from 

 57.9% to 73.2% (Figure 3-27; Appendix C, Table 4). As expected, these stations exhibited 

 the lowest reported values of fme-grained material for normalization procedures. 



The average TOC concentration of the sediments collected from the surface of the 

 MQR mound was 18364 ppm (Appendix C, Table 4). Individual TOC values ranged from 

 11000 ppm at MQR-2 and MQR-9 to 27000 ppm (MQR-4). These data exhibited bi- 

 modality, with higher TOC concentrations found on the eastern side of the MQR mound, 

 corresponding to the higher percentage of fme-grained material (Figure 3-27). 



Total LMW PAH values were slightly higher for the MQR mound in comparison to 

 the reference areas, averaging 0.944 ppm (Appendix C, Table 5). Individual analyte and 

 total LMW values between stations showed increased variability within the MQR mound 

 data relative to the reference areas. Total LMW values from the MQR mound ranged from 

 0.498 ppm to 1 .567 ppm. The total HMW PAHs from the MQR mound were also slightly 

 higher than the reference areas, averaging 3.924 ppm, with a range of values from 1.630 

 ppm to 6.260 ppm. 



The results of metals analysis of the MQR mound sediments were similar to the 

 results of the reference area sediments (Appendix C, Table 6). The raw concentrations of 

 the eight metals associated with anthropogenic activity for the MQR mound fall within the 

 "low" level of contamination category as defined by the NERBC (Appendix A, Table 10; 

 NERBC 1980). 



3.3 CLIS Reference Areas 



As part of the DAMOS tiered monitoring protocols, data are collected from multiple 

 reference areas surrounding the disposal site to provide a baseline against which results from 

 the dredged material disposal mounds are compared. CLIS-REF has been a reference area 

 for CLIS since the beginning of the DAMOS Program. The two newer reference areas, 

 2500W and 4500E, have been monitored since the late- 1980s. During the July 1994 survey 

 at CLIS, REMOTS® sediment-profile photography and sediment grab sampling were 

 conducted for comparison with the environmental monitoring data collected over the NHAV 

 93 and MQR mounds. Complete REMOTS® results for the CLIS reference areas are 

 available in Appendix B, Table 3. Raw and normalized sediment chemistry and grain size 

 analysis results for 2500W, 4500E, and CLIS-REF are located in Appendices C and D, 

 respectively. 



Monitoring Cruise at the Central Long Island Sound Disposal Site, July 1994 



