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Title: Sampling strategies for confined disposal facilities (CDF) characterization
Authors: Clarke, Joan U.
McGrath, Christian J.
Estes, Trudy J.
Keywords: Dredging spoil--Sampling
Sediment control--Facilities
Publisher: Environmental Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: ERDC ; TN-DOER-D12
Abstract: Upland disposal capacity for dredged material is diminishing in many Corps Districts, resulting in deferral of navigation dredging in some areas. There are many site-specific limitations to construction or expansion of confined disposal facilities (CDFs), including high waterfront land values, cost of construction, siting conflicts, and foundation strength limitations. Removal of dredged material from CDFs for beneficial use appears to offer the best potential for sustaining existing CDF capacity. There has been no baseline established, however, regarding the intensity of sampling necessary to adequately characterize materials in a CDF for this purpose, nor guidance developed regarding parameters that should be evaluated to assess feasibility and benefit of material recovery. A previous Technical Note (Estes and Clarke 2011) examined the Chicago Area CDF as a case study to illustrate various aspects of CDF characterization for beneficial reuse of dredged material, including physical and chemical characterization with associated uncertainty analysis. The purpose of this technical note is to describe several sampling strategies that may be appropriate for CDF characterization. Sampling considerations and the use of interpolation tools are described for the quantification of CDF material of interest for removal, including ways to estimate volume of material and visualize its distribution within the CDF. For the goal of estimating mean concentrations of contaminants of concern, recommendations are given for determining sample size (number of samples) and selecting a sampling strategy. A metric based on sampling and analysis cost, and on evaluation of precision and bias in the resulting parameter estimates, was developed to facilitate selection of an optimum sampling and compositing strategy for a given site.
Description: Technical Note
Appears in Collections:Technical Note

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