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ERDC TN-DOER-C13
July 2000
Substances Control Act (TSCA). Cost to manage such materials must be considered in the
economic analysis if the potential to produce them exists. Preliminary chemical characterization
will be important in this regard.
Screening criteria can be applied for the entire sediment mass within a waterway or to specific
reaches within the waterway if such reaches define areas with similar characteristics, or if the reaches
will be separately handled. Similarly, the screening criteria can be applied to the entire dredged
material mass within the CDF for proposed reclamation or to separate zones, such as areas with
materials having higher coarse fractions (such as mounds near inflow points). Compositing of
samples during characterization should be done carefully, however. If separation is planned,
samples should not be composited unless materials will be blended in a similar manner for
processing (Olin et al. 1999).
Calculation of MRP. The calculation of MRP is derived from a comparison of the GSD of the
material to the BU specification (assuming COC levels are acceptable) and an estimate of the tons
dry weight of material available. Assuming that the available GSD and contaminant data point to
separation as a possible management approach, the MRP following separation must be determined.
The definition of MRP is expressed in terms of tons dry weight of product for two reasons. First,
volumes and wet weights may change with the relative gain or loss of water during separation or
dewatering processes, but the dry weight of product is essentially constant. Second, project
requirements for a product derived from separation would usually be expressed on a dry weight
basis. This is especially true for products such as fine aggregates or manufactured soil products.
Following separation, the product intended for BU and the residual material will have different grain
size distributions compared to the bulk material distribution prior to separation. Figure 4 illustrates
the typical case in which the desired product is specified as having a coarser grain size distribution
than the initial material prior to separation. The specifications for an acceptable product will usually
include a range of grain sizes, and this is illustrated by the band of distributions shown in the figure.
The recommended method for calculating MRP is as follows:
i=n
 Psi Wsi
MRP =
(1)
i=0
where
MRP = material recovery potential, tons
Psi = percentage by weight of sample grain size meeting the BU material specification
for sample i (as a decimal)
Wsi = dry weight of material represented by sample i, tons
n = number of samples considered
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