Table 2-1 



Pre-Dredge Mound Material Bulk Sediment Characteristics 



13 



Dredge Location: 

 Sample ID*: 



Year Collected: 



Stamford 



GEB-1 to 

 GEB-3 



1978 



Black Rock 

 BR-1 to BR-37 



1983 



Norwalk (Mound) 



PE-8, PE-9, 

 PE-10 



1979 



Mill River 

 PE-1, PE-2 



1980 



Liquid Limit 



120 - 156 



112 -210 



76 - 105 



198 - 205 



Plastic Limit 



46-56 



44 - 84 



36-45 



82 -83 



Plastic Index 



74 - 100 



32 - 142 



40-60 



103 - 115 



% Solids 



29-41 



23.4-48.8 



39-71.5 



23 -24 



Sediment pH 



6.95 - 7.4 



7.0-7.6 



7.1 -7.6 



6.7 -7.0 



% Volatile Solids 



5.8 - 17 



7.0- 16.1 



1.4-5.6 



16.2 -29.1 



ppm Oil & Grease 



3560 - 28,900 



8400 - 44,000 



559 - 3430 



10 - 500 



ppm Mercury 



0.95 - 2.9 



0.12 - 1.41 



0.3 -2.7 



2.4-4.1 



ppm Lead 



195 - 1099 



190 - 2200 



31 - 272 



450 - 825 



ppm Zinc 



441 - 2417 



560- 1180 



86 - 170 



625 - 1 145 



ppm Arsenic 



7.6 - 12.7 



2.1 - 10.1 



2-6.3 



4 



ppm Cadmium 



4.9-45.3 



7.5 - 58 



2-3 



200 - 260 



ppm Chromium 



NA 



NA 



25 -78 



NA 



ppm Copper 



342 - 1167 



890 - 3400 



45 - 131 



570 - 915 



ppm Nickel 



61 - 151 



50 - 250 



20- 28 



89-95 



ppm Vanadium 



27 -61 



100 - 987 



8 -47 



50 - 100 



* Samples collected prior to dredging: 



and 2-7. 

 NA = Not available 



station locations are shown in Figures 2-2, 2-4, 2-6, 



Sediment Capping of Subaqueous Dredged Material Disposal Mounds 



