B.2.2 Effluent elutriate test procedure

h. Wide-mouth, 1-gal capacity glass jars with Teflon-lined screw-type lids for

sample mixing. These jars should also be used for sample containers when

samples are to be analyzed for organic COC.

Prior to use, all glassware, filtration equipment, and filters should be

thoroughly cleaned. Wash all glassware with detergent, rinse five times with tap

water, place in a clean 10-percent (or stronger) HC1 acid bath for a minimum of

4 hr, rinse five times with tap water, and then rinse five times with distilled or

deionized water. Soak filters for a minimum of 2 hr in 5 mular HCR bath, and then

rinse 10 times with distilled water. It is also a good practice to discard the first

50 mL of filtrate.

B.2.2 Effluent elutriate test procedure

The step-by-step procedure for conducting the effluent elutriate test (Fig-

ure B-1) is outlined below.

Step 1 - Slurry preparation. The sediment and water from the proposed

dredging site should be mixed to a concentration approximately equal to the

expected average field inflow concentration. If estimates of the average field

inflow concentration cannot be made based on past data, a slurry concentration of

150 g/L (dry weight basis) should be used. Predetermine the concentration of the

well-mixed sediment in grams per liter (dry weight basis) by oven drying a small

subsample of known volume. Each 4-L cylinder to be filled will require a mixed

slurry volume of 3-3/4 L. The volumes of sediment and water to be mixed for a

3-3/4-L slurry volume may be calculated using the following expressions:

C slurry

V sediment = 3.75

(B-1)

C sediment

and

V water = 3.75 - V sediment

(B-2)

where

Vsediment = volume of sediment, in L

3.75 = volume of slurry for 4-L cylinder, L

Cslurry = desired concentration of slurry, g/L (dry weight basis)

Csediment = predetermined concentration of sediment, g/L (dry weight basis)

Vwater = volume of disposal site water, in L

Step 2 - Mixing. Mix the 3-3/4 L of slurry by placing appropriate volumes

of sediment and water from the proposed dredging site in a 1-gal glass jar and

Appendix B Column Settling Test and Effluent Elutriate Procedures