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DMMP User Manual

The DMMP User Manual provides detailed information on current procedures for evaluating proposed dredged material for open-water disposal, as well as provides information on disposal sites and beneficial uses of dredged material.  The User Manual is periodically updated to reflect program changes made through the SMARM process.

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Contact the DMMO

Seattle District (CENWS)
Dredged Material Management Office
4735 E. Marginal Way S. Bldg. 1202
Seattle, WA 98134-2388
206-764-6083
206-764-6945
206-764-6550

2025 Draft DMMP User Manual

The procedures in the draft 2025 Dredged Material Evaluation and Disposal Procedures User Manual will replace guidance in all previous versions of the DMMP User Manual. This document is currently under public review. Once finalized, the updates will apply to all projects in Puget Sound, on the Washington Coast, the north side of the Columbia River, and all other water bodies within the State of Washington.

This edition of the DMMP User Manual reflects technical and policy updates that have occurred through the sediment management annual review meeting process and public workshops. It is considered to be a living document and is revised periodically as needed to reflect changes made through the public review process.  See Appendix A for a list of the notable updates in this version of the User Manual.

To download the User Manual click the link or image below.

2025 Draft DMMP User Manual

BioStat

Seattle District has developed statistical analysis software called BioStat to facilitate bioassay statistical comparisons with appropriate reference sediments. Submittal of screen shots or statistical reports from BioStat will provide the documentation necessary to support summarized interpretations of bioassay data in the sediment characterization report.

To download a .zip file with all the files necessary to run BioStat, click here.