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|Title:||Guidelines for physical and biological monitoring of aquatic dredged material disposal sites|
|Authors:||Coastal Engineering Research Center (U.S.)|
Dredging Operations Technical Support Program (U.S.)
Fredette, Thomas J., 1955-
Nelson, David A.
Clausner, James E.
Anders, Fred J.
|Publisher:||Environmental Laboratory (U.S.)|
Engineer Research and Development Center (U.S.)
Abstract: This report is a preliminary set of guidelines for physical and biological monitoring of aquatic uncontaminated dredged material disposal sites. The need for guidelines on this subject was one of the items identified at the August 1985 Long-Term Management Strategy Workshop sponsored by the Water Resources Support Center. The resulting guidelines are intended to serve as a "working" document that can be periodically improved as experience dictates. Emphasis is placed on the establishment of concise objectives and hypotheses, the use of multidisciplinary approaches to developing monitoring programs, and the provision of results that are relevant and useful to site managers. A "tiered" step-wise procedure to develop a monitoring program is presented, along with a summary of the basic tools and techniques ror biological and physical analyses. More detailed information is available in "Selected Tools and Techniques for Physical and Biological Monitoring of Aquatic Dredged Material Disposal Sites" (Technical Report D-90-11). Ideally, monitoring of open-water dredged material disposal sites should be prospective. In prospective programs, specific desirable and undesirable conditions are clearly defined prior to sampling. Observations or measurements are taken to determine if site conditions conform to these defined conditions. The resulting monitoring can thus focus on the detection of changes in specific conditions rather than identifying any or all detectable changes. A monitoring program should be multitiered, with each level (tier) having its own predetermined environmental threshold, hypothesis, sampling design, and management option(s) should the threshold be exceeded. Each tier would have an increasing predetermined intensity (threshold). If a threshold is not exceeded, the next tier of monitoring would not be needed. If a threshold is exceeded, the next tier of monitoring would be triggered. In addition, this provides an "early warning" system for detection of predetermined "adverse effects." This early-warning system allows site managers to make modifications in operations (e.g., capping a disposal site with clean sand) before an unacceptable impact occurs.
|Rights:||Approved for public release; distribution is unlimited.|
|Appears in Collections:||Technical Report|
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|DOTS-TR-D-90-12.pdf||2.82 MB||Adobe PDF|