Open-water disposal of dredged marine sediment is a state and federal approved Dredged Material Management Program (DMMP) where unconfined dredged material is placed at designated sites in oceans, estuaries, (a bay may be a large estuary) rivers and lakes in a manner that dredged material is not isolated from the adjacent waters during placement.
Placement is generally via release from pipelines, barges or hoppers. (Dredged Sediment is released into the environment from a pipe or by opening the bottom of a barge and allowing the material to drift down to the bottom). Please see photo above.Open water sites can be either dispersive or non-dispersive (retentive or non-retentive) depending on whether the sediment is transported out of the site or remains within the designated boundaries. Generally, clean or mildly contaminated sediments are disposed of in open water, although the disposal of highly contaminated material can also be considered with appropriate control measures.
Regardless of the type of in-water disposal, placing dredged materials in the aquatic area raises several key concerns, including sediment and water quality, sediment transport, water circulation, impacts to fisheries, and impacts to biological communities, especially endangered/threatened species.Sediments placed in water must meet sediment quality regulations outlined in the Dredged Material Evaluation Framework. The majority of sediment disposed in the estuary's aquatic area consists of coarse, clean sand dredged from maintained navigation channels. This material must meet the water and sediment quality standards (SQS).
After sediment is placed in an open water disposal site, some or all of it is eventually transported to other areas, potentially resulting in adverse impacts to shallow productive areas and fishing areas, resulting in an increase in dredging requirements on other projects. (Creating a cycle of dredging and additional clean up).The sediment transport patterns at in-water sites need to be assessed prior to disposal.Disposing of material in-water usually creates a mound or otherwise obstructs water flow.
Consequently, water circulation patterns in the vicinity of the disposal site are altered. These changes can have detrimental effects. For instance, unexpected erosion or accretion can occur downstream from the disposal site. Conversely, the changes can sometimes be beneficial. For example, the scouring of the channel can be increased. In all cases, the potential effects that may result from circulation changes need to be assessed prior to undertaking disposal.
In-water disposal often results in the direct smothering of benthic organisms at the disposal site and indirect impacts to organisms living down current from the site. Disposal often impacts commercial fisheries by decreasing the size and depth of net drifts, potentially creating snags in fishing areas, and obstructing fishing access with dredging equipment.As of 2003, the US Army Corps of Engineers (USACE) biennial report states that 78,883 cubic yards of dredged material has been disposed at the Bellingham Bay open water disposal site.In addition, the USACE estimates that the site can absorb up to 181, 500 additional cubic yards over the next 50 years.Who can use the site? We don’t have all of the answers, but in the I & J Waterway PSDDA Sediment Characterization Sampling and Analysis Plan, RETEC (Port of Bellinham Consultant) estimates that mercury-laced dredged materials that pass chemical and biological guidelines may be disposed of at the Rosario Straits dispersive site, or the Bellingham Bay non-dispersive open water disposal site as part of the proposed clean up project for Bellingham Bay.
Additional information regarding the dredging of the I & J Waterway can be found on the Dept of Ecology website under the I & J Waterway PSDDA Characterization and Sampling Analysis Plan.Hence, the Port of Bellingham plans to use the Bellingham Bay site, or the Rosario site to dispose of “low level” contaminated dredged materials from the I&J Waterway, the Whatcom Waterway and Squalicum Harbor clean up. All of the materials potentially contain low to high levels of contaminants.
The Bellingham Bay disposal site has been used off an on since the 1960’s to dispose of contaminated sediments. Early dredged materials were not tested for contaminate levels prior to dumping.To date, the site has not undergone thorough testing to determine toxicity levels or the suitability of the site for future dredged material disposal.Local tribes have long referred to the Bellingham Bay site as a dead zone for fishing.
How can I learn more?
The USACE publishes biannual DMMP reports on the Region 10 website. The reports are easily accessed through Ecology’s Aquatic Lands Cleanup webpage. Scroll down to the bottom of the page. Click the DMMP Biennial Reports link under the “other links” heading and you will be taken to the Region 10 website with four DMMP reports for Puget Sound.Once again, there is very little information published on the Bellingham Bay open water disposal site.
To date, reports state that only partial monitoring studies have been completed for the Bellingham Bay Disposal site.The WA State Department of Natural Resources (DNR) has recently placed Bellingham on a list of proposed open water disposal sites to be evaluated, tested and monitored over the next two years by a private consulting firm. By statutory requirement, DNR provides, manages, and monitors aquatic land disposal sites on state owned aquatic lands for materials dredged from rivers, harbors, and shipping lanes.
Currently, permits to dispose dredged materials at the Bellingham Bay site are issued by the Army Corps of Engineers DMMP program. Federal law does not require publication of permits for open water disposal. Bellingham is one of twelve open water dredged material disposal sites in Washington. (Six are currently in use).
An EPA diver report on Bellingham Open Water Disposal site:
Disposal of Dredged-material at Open-water Sites.The Region 10 Dive Team participated in an interagency effort to assess benthic conditions at dredged-material open-water disposal sites in Bellingham and Padilla Bays, located near Bellingham and Anacortes, WA, respectively.At Bellingham Bay there was concern that the 146 acre marine disposal site lacked the capacity to contain additional dredged material from Corps of Engineers and Georgia Pacific dredging projects. At Padilla Bay, state resource agencies wanted to evaluate the effect of disposing of 150,000 cubic yards of sandy Swinomish Channel dredged material on an existing silt bottom. It was believed that a sandier substrate might improve Dungeness crab habitat at the disposal site.
Where is the disposal site located?
Center coordinates for the disposal sites are: 48o 49' 40" N Lat. and 122o 31' 30" W Long. in Bellingham Bay; 48o 31' 04" N Lat. and 122o 33' 05" W Long. in Padilla Bay. When: The Bellingham Bay site was inspected in February 1979 and April 1982. The Padilla Bay site was inspected in April 1982.How were the sites examined? Benthic observations were made along transects radiating out from the approximate center of the disposal areas. A buoy was located near the center of each site. Still photographs were taken. No sediment samples were taken.
Historical results:
In 1979 at Bellingham Bay, the divers noted that:
1) the bottom was composed mainly of compacted clay and silty sand;
2) the profile in the disposal area was very uneven (hummocky); and,
3) some of the dredged material was located outside of the established disposal site (it was unclear whether the cause was "drift" from the site or short-dumping). *By 1982, the profile at the Bellingham Bay site appeared to be much more even and the dredged material appeared to have settled. No evidence of erosion was observed and benthic animals were recolonizing the area. In Padilla Bay, the divers noted that despite the disposal of sandy dredged material, the dominant substrate still appeared to be silt. Based on the observations, the interagency dive teams recommended that continued dumping could occur at both disposal sites. http://yosemite.epa.gov/r10/OEA.NSF/Investigations/Dive+Sediment
There are dozens of reports and studies on this topic. For the most recent reports and information about the DMMP Dioxin Project, scroll down to the article, What's the Port up to?
Background reference materials:Seattle PI Article regarding disposal of PCB contaminated sediment: http://seattlepi.nwsource.com/local/331350_port12.html
Links to other sediment management agency sitesUS Army Corps of Engineers Seattle District HomepageDredged Material Management Office - US Army Corps of Engineers Seattle District Dredged Material Management Program (DMMP)/Puget Sound Dredge Disposal Analysis (PSDDA) Clarification PapersDMMP Biennial ReportsEnvironmental Protection Agency Region 10 HomepageEPA Region 10 Sediment LinksWashington Department of Natural Resources HomepagePuget Sound Water Quality Action Team HomepagePuget Sound Protocols
Open Water Disposal Techniques (great pictures)http://el.erdc.usace.army.mil/workshops/08apr-doer/9_OpenWaterDisposal_Bailey.pdfI&J Waterway document: http://www.ecy.wa.gov/programs/tcp/sites/blhm_bay/sites/I_and_J_Waterway/I&J%20Seds%20RIFS%20App%20B%20Text.pdfMichigan Governor bans open water disposal of certain chemicals in Lake Michigan http://www.michigan.gov/gov/0,1607,7-168--84861--,00.htmlErosion of Cohesive Dredged Material in Open-Water DisposalSites http://el.erdc.usace.army.mil/elpubs/pdf/drp1-07.pdfToxic Contaminants of Sediments in Puget Sound http://gbic.tamug.edu/gbeppubs/T3/gbnepT3_51-56.pdfApplicable Washington Administrative Code authorizing open water disposal of dredged materials WAC 332-30-166http://apps.leg.wa.gov/WAC/default.aspx?cite=332-30-166
Placement is generally via release from pipelines, barges or hoppers. (Dredged Sediment is released into the environment from a pipe or by opening the bottom of a barge and allowing the material to drift down to the bottom). Please see photo above.Open water sites can be either dispersive or non-dispersive (retentive or non-retentive) depending on whether the sediment is transported out of the site or remains within the designated boundaries. Generally, clean or mildly contaminated sediments are disposed of in open water, although the disposal of highly contaminated material can also be considered with appropriate control measures.
Regardless of the type of in-water disposal, placing dredged materials in the aquatic area raises several key concerns, including sediment and water quality, sediment transport, water circulation, impacts to fisheries, and impacts to biological communities, especially endangered/threatened species.Sediments placed in water must meet sediment quality regulations outlined in the Dredged Material Evaluation Framework. The majority of sediment disposed in the estuary's aquatic area consists of coarse, clean sand dredged from maintained navigation channels. This material must meet the water and sediment quality standards (SQS).
After sediment is placed in an open water disposal site, some or all of it is eventually transported to other areas, potentially resulting in adverse impacts to shallow productive areas and fishing areas, resulting in an increase in dredging requirements on other projects. (Creating a cycle of dredging and additional clean up).The sediment transport patterns at in-water sites need to be assessed prior to disposal.Disposing of material in-water usually creates a mound or otherwise obstructs water flow.
Consequently, water circulation patterns in the vicinity of the disposal site are altered. These changes can have detrimental effects. For instance, unexpected erosion or accretion can occur downstream from the disposal site. Conversely, the changes can sometimes be beneficial. For example, the scouring of the channel can be increased. In all cases, the potential effects that may result from circulation changes need to be assessed prior to undertaking disposal.
In-water disposal often results in the direct smothering of benthic organisms at the disposal site and indirect impacts to organisms living down current from the site. Disposal often impacts commercial fisheries by decreasing the size and depth of net drifts, potentially creating snags in fishing areas, and obstructing fishing access with dredging equipment.As of 2003, the US Army Corps of Engineers (USACE) biennial report states that 78,883 cubic yards of dredged material has been disposed at the Bellingham Bay open water disposal site.In addition, the USACE estimates that the site can absorb up to 181, 500 additional cubic yards over the next 50 years.Who can use the site? We don’t have all of the answers, but in the I & J Waterway PSDDA Sediment Characterization Sampling and Analysis Plan, RETEC (Port of Bellinham Consultant) estimates that mercury-laced dredged materials that pass chemical and biological guidelines may be disposed of at the Rosario Straits dispersive site, or the Bellingham Bay non-dispersive open water disposal site as part of the proposed clean up project for Bellingham Bay.
Additional information regarding the dredging of the I & J Waterway can be found on the Dept of Ecology website under the I & J Waterway PSDDA Characterization and Sampling Analysis Plan.Hence, the Port of Bellingham plans to use the Bellingham Bay site, or the Rosario site to dispose of “low level” contaminated dredged materials from the I&J Waterway, the Whatcom Waterway and Squalicum Harbor clean up. All of the materials potentially contain low to high levels of contaminants.
The Bellingham Bay disposal site has been used off an on since the 1960’s to dispose of contaminated sediments. Early dredged materials were not tested for contaminate levels prior to dumping.To date, the site has not undergone thorough testing to determine toxicity levels or the suitability of the site for future dredged material disposal.Local tribes have long referred to the Bellingham Bay site as a dead zone for fishing.
How can I learn more?
The USACE publishes biannual DMMP reports on the Region 10 website. The reports are easily accessed through Ecology’s Aquatic Lands Cleanup webpage. Scroll down to the bottom of the page. Click the DMMP Biennial Reports link under the “other links” heading and you will be taken to the Region 10 website with four DMMP reports for Puget Sound.Once again, there is very little information published on the Bellingham Bay open water disposal site.
To date, reports state that only partial monitoring studies have been completed for the Bellingham Bay Disposal site.The WA State Department of Natural Resources (DNR) has recently placed Bellingham on a list of proposed open water disposal sites to be evaluated, tested and monitored over the next two years by a private consulting firm. By statutory requirement, DNR provides, manages, and monitors aquatic land disposal sites on state owned aquatic lands for materials dredged from rivers, harbors, and shipping lanes.
Currently, permits to dispose dredged materials at the Bellingham Bay site are issued by the Army Corps of Engineers DMMP program. Federal law does not require publication of permits for open water disposal. Bellingham is one of twelve open water dredged material disposal sites in Washington. (Six are currently in use).
An EPA diver report on Bellingham Open Water Disposal site:
Disposal of Dredged-material at Open-water Sites.The Region 10 Dive Team participated in an interagency effort to assess benthic conditions at dredged-material open-water disposal sites in Bellingham and Padilla Bays, located near Bellingham and Anacortes, WA, respectively.At Bellingham Bay there was concern that the 146 acre marine disposal site lacked the capacity to contain additional dredged material from Corps of Engineers and Georgia Pacific dredging projects. At Padilla Bay, state resource agencies wanted to evaluate the effect of disposing of 150,000 cubic yards of sandy Swinomish Channel dredged material on an existing silt bottom. It was believed that a sandier substrate might improve Dungeness crab habitat at the disposal site.
Where is the disposal site located?
Center coordinates for the disposal sites are: 48o 49' 40" N Lat. and 122o 31' 30" W Long. in Bellingham Bay; 48o 31' 04" N Lat. and 122o 33' 05" W Long. in Padilla Bay. When: The Bellingham Bay site was inspected in February 1979 and April 1982. The Padilla Bay site was inspected in April 1982.How were the sites examined? Benthic observations were made along transects radiating out from the approximate center of the disposal areas. A buoy was located near the center of each site. Still photographs were taken. No sediment samples were taken.
Historical results:
In 1979 at Bellingham Bay, the divers noted that:
1) the bottom was composed mainly of compacted clay and silty sand;
2) the profile in the disposal area was very uneven (hummocky); and,
3) some of the dredged material was located outside of the established disposal site (it was unclear whether the cause was "drift" from the site or short-dumping). *By 1982, the profile at the Bellingham Bay site appeared to be much more even and the dredged material appeared to have settled. No evidence of erosion was observed and benthic animals were recolonizing the area. In Padilla Bay, the divers noted that despite the disposal of sandy dredged material, the dominant substrate still appeared to be silt. Based on the observations, the interagency dive teams recommended that continued dumping could occur at both disposal sites. http://yosemite.epa.gov/r10/OEA.NSF/Investigations/Dive+Sediment
There are dozens of reports and studies on this topic. For the most recent reports and information about the DMMP Dioxin Project, scroll down to the article, What's the Port up to?
Background reference materials:Seattle PI Article regarding disposal of PCB contaminated sediment: http://seattlepi.nwsource.com/local/331350_port12.html
Links to other sediment management agency sitesUS Army Corps of Engineers Seattle District HomepageDredged Material Management Office - US Army Corps of Engineers Seattle District Dredged Material Management Program (DMMP)/Puget Sound Dredge Disposal Analysis (PSDDA) Clarification PapersDMMP Biennial ReportsEnvironmental Protection Agency Region 10 HomepageEPA Region 10 Sediment LinksWashington Department of Natural Resources HomepagePuget Sound Water Quality Action Team HomepagePuget Sound Protocols
Open Water Disposal Techniques (great pictures)http://el.erdc.usace.army.mil/workshops/08apr-doer/9_OpenWaterDisposal_Bailey.pdfI&J Waterway document: http://www.ecy.wa.gov/programs/tcp/sites/blhm_bay/sites/I_and_J_Waterway/I&J%20Seds%20RIFS%20App%20B%20Text.pdfMichigan Governor bans open water disposal of certain chemicals in Lake Michigan http://www.michigan.gov/gov/0,1607,7-168--84861--,00.htmlErosion of Cohesive Dredged Material in Open-Water DisposalSites http://el.erdc.usace.army.mil/elpubs/pdf/drp1-07.pdfToxic Contaminants of Sediments in Puget Sound http://gbic.tamug.edu/gbeppubs/T3/gbnepT3_51-56.pdfApplicable Washington Administrative Code authorizing open water disposal of dredged materials WAC 332-30-166http://apps.leg.wa.gov/WAC/default.aspx?cite=332-30-166
Elisabeth, thanks again for raising awareness about the multi-agency Dredged Material Management Program and how it relates to Bellingham Bay issues.
ReplyDeleteIn your July 22 blog post, you describe the Port of Bellingham’s plans for disposing of contaminated materials dredged from two sites where the Department of Ecology is overseeing cleanup under the state’s toxics cleanup law, the Model Toxics Control Act. I’d like to expand on and clarify some of the information you provided.
No decision has been made about in-water disposal of sediments slated for dredging from portions of the I & J Waterway and Whatcom Waterway sites.
We have either finished or are working on a comprehensive environmental site study (remedial investigation) and analyzing cleanup options (feasibility study) for these sites, under the Model Toxics Control Act. As part of that work, Ecology approved a preliminary evaluation to determine if in-water disposal was a viable option, but the data have not yet been submitted to the Dredged Material Management Program agencies for a final decision. This will occur later during the engineering, design and permitting phase of the cleanup process.
Sediment from some areas within both sites was found to meet existing in-water disposal criteria, but those criteria may change. Policies for sediments containing dioxin are being revised with public and stakeholder review. Draft guidance and an implementation approach should be available for formal public comment later this year.
Specifically regarding the Bellingham Bay in-water disposal site, it hasn’t been used since 1998. Plus, the port and Lummi Nation are recommending permanent closure of the Bellingham Bay disposal site as the result of an August 2009 agreement. The site is in relatively shallow water (96 feet) compared with other sites (300 – 560 feet), and it is in an area with an important tribal and commercial crab fishery. The Dredged Material Management Program agencies are reviewing the recommendation.
(continued in next comment)
Curt Hart
Ecology communications manager
360-407-6990, curt.hart@ecy.wa.gov
Katie Skipper
Ecology communications manager
360-715-5205, katie.skipper@ecy.wa.gov
(continued)
ReplyDeleteTo provide context to this Bellingham Bay-specific information perhaps it would be helpful to you and your readers if we give some background about the Dredged Material Management Program.
Federal and state laws require scientific evaluation of dredged materials, and they require disposal that doesn’t harm people or the environment. The Dredged Material Management Program is a joint process used by state and federal sediment specialists, biologists, chemists and other environmental experts to manage 13 publicly-approved open-water disposal sites, eight of which are in the Puget Sound area.
The program includes representatives from the U.S. Army Corps of Engineers and Environmental Protection Agency, and the Washington departments of Ecology and Natural Resources.
When an applicant proposes a dredging project, the agencies look at historical uses of the area, sediment chemistry, the distance to existing federal and state cleanup sites, the makeup of materials at the site, and how much and where the applicant proposes to dispose of the material.
If the agencies find highly contaminated sediments, they stop. The dredging project must go through a different regulatory process such as EPA’s Superfund program or Ecology’s Toxics Cleanup Program.
The program routinely evaluates what are acceptable and unacceptable levels of contamination for a wide range of pollutants. As science advances, the program updates and refines its guidance for assessing dredged materials.
Of the eight Puget Sound area sites, three are dispersive, where fast currents quickly wash away dredged materials with the tides. The agencies don’t allow disposal of any material that could harm humans or sediment-dwelling organisms at these sites.
The other five Puget Sound sites, including Bellingham Bay, are non-dispersive, with slow currents, so dredged material stays on site. Sediments placed in these sites can have minor adverse effects on sediment-dwelling life within the site but they can’t affect life outside the site boundary. But again, the Bellingham site hasn’t been used for many years, and the port and Lummi Nation have agreed to support its permanent closure.
Check out these links for more information about the Dredged Material Management Program:
• Focus sheet on state Dredged Material Management Program:
www.ecy.wa.gov/pubs/0706029.pdf (PDF 131.34 KB)
• U.S. Army Corps of Engineers Dredged Material Management Office: www.nws.usace.army.mil/PublicMenu/Menu.cfm?sitename=dmmo&pagename=home
• Washington Department of Natural Resources Dredged Material Management Program:
www.dnr.wa.gov/BusinessPermits/Topics/AquaticResources/Pages/aqr_dredged_material_program.aspx
Regards,
Curt Hart
Ecology communications manager
360-407-6990, curt.hart@ecy.wa.gov
Katie Skipper
Ecology communications manager
360-715-5205, katie.skipper@ecy.wa.gov