Figure 6-4. Photo of Sequential Batch Leachate Test setup

estimate dredged material-specific equilibrium distribution coefficients. These

data establish a "source of strength" or concentration of COC in leachate

potentially migrating from the CDF. The appropriate leachate test is either the

Sequential Batch Leaching Test (SBLT), Figure 6-4, or the Pancake Column

Leach Test (PCLT), Figure 6-5. The choice of which test to conduct is dependent

on a number of factors. In general, the PCLT should be used for all saltwater

sediments and sediments containing NAPLs. Either the SBLT or PCLT may be

used for freshwater dredged materials. Since the SBLT test is a simpler procedure

and is more cost and time effective than the PCLT, the SBLT test would normally

be preferred for freshwater sediments. Appendix D contains more detailed

discussions on selection of SBLT vs. PCLT and appropriate test conditions.

Figure 6-4. Photo of Sequential Batch Leachate Test setup

Figure 6-5. Photo of Pancake Column Leach Test setup

6-10

Chapter 6

Leachate to Groundwater