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1. Introduction
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1.1 Background
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Site Number: |
10MY |
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Contract Number: |
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D.O. Number: |
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Action Memo Date: |
1/27/2015 |
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Response Authority: |
CERCLA |
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Response Type: |
Time-Critical |
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Response Lead: |
PRP |
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Incident Category: |
Removal Action |
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NPL Status: |
Non NPL |
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Operable Unit: |
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Mobilization Date: |
4/13/2015 |
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Start Date: |
4/13/2015 |
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Demob Date: |
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Completion Date: |
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CERCLIS ID: |
WAD980726368 |
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RCRIS ID: |
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ERNS No.: |
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State Notification: |
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FPN#: |
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Reimbursable Account #: |
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1.1.1 Incident Category
Time Critical Removal Action
1.1.2 Site Description
Tributyl tin-contaminated sediments under Pier 4 in Tacoma, Washington.
1.1.2.1 Location
1 Sitkum Way, Tacoma, WA
1.1.2.2 Description of Threat
Tributyltin at levels exceeding 50,000 ug/kg were found in the sediments under Pier 4 during a predredge sampling performd by the Port of Tacoma in 2013. Tributyltin is an environmental toxin affecting mollusks and was banned in the 1990s.
1.1.3 Preliminary Removal Assessment/Removal Site Inspection Results
The Port of Tacoma collected and analyzed samples of sediment under Pier 4 in July 2014 to determine the extent and depth of contamination. Results indicated a removal action was necessary to dredge and remove approximately 50,000 cubic yards of sediment.
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2. Current Activities
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2.1 Operations Section
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2.1.1 Narrative
2.1.2 Response Actions to Date
On 12/30/2015, the Port of Tacoma's contractor, OMI, completed the initial dredging which consisted of two passes over the footprint of contaminated sediment. A survey was conducted on 12/31/2015 and sampling of the surface sediments began on 1/4/2016. The lab started reporting preliminary bulk TBT results on 1/6/2016 and TBT pore-water results on 1/8/2016. Pore-water results indicated that extensive low level TBT contamination remained in many of the dredge management units. After consulting with EPA and the DMMP, the Port agreed to re-dredge an additional foot from the affected units. OMI finished removing all the remaining broken pilings and started re-dredging on 1/18/2016.
2.1.3 Enforcement Activities, Identity of Potentially Responsible Parties (PRPs)
The Port of Tacoma is the PRP performing the removal action. Research is being conducted to identify additional PRPs.
2.1.4 Progress Metrics
| Waste Stream |
Medium |
Quantity |
Manifest # |
Treatment |
Disposal |
| TCT contaminated |
sediment |
59,835 ton |
many |
landfill |
LRI, Tacoma |
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2.2 Planning Section
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2.2.1 Anticipated Activities
2.2.1.1 Planned Response Activities
Contaminated dredging and operation of the transload and water treatment site at APM terminal is expected to continue into February 2016.
2.2.1.2 Next Steps
2.2.2 Issues
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2.3 Logistics Section
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No information available at this time.
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2.4 Finance Section
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No information available at this time.
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2.5 Other Command Staff
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No information available at this time.
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3. Participating Entities
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No information available at this time.
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4. Personnel On Site
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EPA
The Port of Tacoma
Orion Marine Contractors (OMI)
Subcontractors to OMI
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5. Definition of Terms
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No information available at this time.
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6. Additional sources of information
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No information available at this time.
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7. Situational Reference Materials
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No information available at this time.
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