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|Title:||Comprehensive analysis of migration pathways (CAMP) : contaminant migration pathways at confined dredged material disposal facilities|
|Authors:||Dredging Operations Technical Support Program (U.S.)|
Brannon, James M.
Pennington, Judith C.
Myers, Tommy E.
|Keywords:||Confined disposal facilities|
Dredged material disposal
|Publisher:||Environmental Laboratory (U.S.)|
Engineer Research and Development Center (U.S.)
Abstract: A confined disposal facility (CDF) is a diked enclosure having either permeable or low-permeable walls that are used to retain dredged material solids. There are two types of CDFs, upland and nearshore. An upland CDF is located in an environment that is not inundated by water, while nearshore CDFs are located within the influence of normal tidal or other water fluctuations. A framework for analysis of contaminant migration, cycling, and mobilization pathways is currently being developed to integrate and assess the physical, chemical, and biological processes that occur in CDFs. The framework will use a tiered approach for estimating and predicting mass transport for contaminants in migration, cycling, and mobilization pathways. Contaminant migration pathways are defined as those that allow a contaminant to leave the confines of the CDF. Contaminant cycling refers to movement of a contaminant in any of its forms between compartments, i.e., sediment to water to organisms, within the confines of a CDF. Contaminant mobilization refers to mechanisms by which contaminants leave a cycle and enter a contaminant migration pathway. This report identifies and documents key contaminant mobility processes and pathways operative in CDFs under varying operational and environmental conditions. It also summarizes what is known about contaminant migration, cycling, and mobilization pathways, provides information on models and assessment techniques, and identifies areas for which insufficient information is available. The present information does not permit evaluation of the relative significance of contaminant migration pathways from a CDF. Pathways involving movement of large masses of water, such as CDF effluent, leaching through permeable dikes, or leaching through the dredged material, have the greatest potential for moving significant quantities of contaminants out of the CDF. Pathways such as volatilization may also result in movement of substantial amounts of volatile organic contaminants from CDFs. The relative importance of contaminant cycling and mobilization pathways to net mass balance has not been determined, but available information on each of the contaminant migration, cycling, and mobilization pathways is summarized in the report. Where possible, methods have been provided for making rough estimates of contaminant mass movement via pathways.
|Rights:||Approved for public release; distribution is unlimited.|
|Appears in Collections:||Miscellaneous Paper|