C.2.2 Procedure

d. Distilled or deionized water.

C.2.2 Procedure

Step 1. Sediment Preparation. Sediment core or grab samples are

normally collected from the proposed dredging site for evaluation of various

contaminant pathways. These may be composited into one bulk sediment or

composited according to horizontal and/or vertical position. The SLRP

procedure must be conducted on each composite considered for separate upland

placement. No more than a 22-L and a minimum 13.2-L volume of each

composite to be tested is required. The sediment should be stored in a sealed

polyurethane bucket at 4 EC until ready to conduct the SLRP procedure. Prior

to removing sediment from the bucket, it should be thoroughly mixed using a

stainless steel electric mixer. Sufficient samples to conduct the SLRP evaluation

can then be removed from the container. Prior to conducting the following

analyses, the sediment should be sieved through a 2-mm sieve to remove inert

gravel fractions or other oversize materials.

Step 1a. Sediment Moisture. Three replicate samples (1 to 2 g) of wet

sediment are placed in preweighed aluminum pans and oven-dried at 110 EC for

24 hr. The pans are then removed and reweighed to determine percent water on

a dry weight basis using the formula:

DMDWB = (WW DW /DW) H 100

(C-1)

where:

DMDWB = percent moisture on a dry weight basis

WW = wet weight of sediment

DW = oven dry weight of sediment

100 = conversion to percent

To determine the amount of wet sediment needed to provide a dry weight

equivalent of any given amount, use the formula:

DWeqv = (DWreq H MDWB) + DWreq

(C-2)

where

DWeqv = amount of wet sediment equal to the dry weight

MDWB = percent moisture on a dry weight basis

DWreq = dry weight sediment required

Step 1b. Air Drying. Approximately 400 g dry weight of wet sediment is

placed in a stainless steel drying pan and air-dried in a greenhouse for 3 weeks to

Appendix C Test Procedures for Surface Runoff Discharges