Superfund Information Systems: Site Profile

Superfund Site:

COMMENCEMENT BAY, NEAR SHORE/TIDE FLATS
TACOMA, WA

Operable Units

Below, EPA has provided a list of the remedial actions selected pertaining to each operable unit.

EPA issues Records of Decision (RODs) to explain which cleanup methods will be used at Superfund National Priorities List sites. EPA has two primary documents that it may use to identify changes to the remedies selected in RODs. EPA uses a ROD Amendment when it needs to make a fundamental change to the remedy. EPA publishes an Explanation of Significant Differences (ESD) for significant changes.

During cleanup, complex sites may be divided into several distinct areas to make the response more efficient. These areas, called operable units (OUs), may address geographic areas, specific problems, or medium (e.g., groundwater, soil) where a specific action is required.

EPA is working to improve data quality. The information presented on this page is undergoing review for accuracy and completeness, and may be subject to change.

OU ID Name Decision Document Cleanup Technologies Selected
in the Decision Document
00 SITEWIDE No decision document
01 NS/TF SEDIMENT Record of Decision
September 30, 1989
Cap (exsitu)
Containment (other, NOS, onsite)
Dredging
Institutional Controls
Monitored Natural Recovery
Monitoring
01 NS/TF SEDIMENT Explanation of Significant Differences
June 24, 1993
Containment (other, NOS, onsite)
Disposal (offsite)
Dredging
ESD - Nonfundamental Change (other)
Other (NOS)
01 NS/TF SEDIMENT Explanation of Significant Differences
July 28, 1997
ESD - Nonfundamental Change (other)
01 NS/TF SEDIMENT Explanation of Significant Differences
August 03, 2000
Institutional Controls
01 NS/TF SEDIMENT Explanation of Significant Differences
February 04, 2002
Cap (exsitu)
Excavation
Monitored Natural Recovery
Monitoring
No Action
01 NS/TF SEDIMENT Explanation of Significant Differences
March 20, 2003
Disposal (offsite)
Excavation
01 NS/TF SEDIMENT Explanation of Significant Differences
September 30, 2004
Institutional Controls
Storage (temporary, onsite)
02 OU 05 RA AREA: ST. PAUL SRC CNTRL (DELETED) No decision document
03 OU 05 RA AREA: SITCUM SOURCE CONTROL No decision document
04 OU 05 RA AREA: MOUTH OF HYLEBOS SOURCE CNTRL No decision document
05 NS/TF SOURCE CONTROL Record of Decision
September 30, 1989
Containment (other, NOS, onsite)
Institutional Controls
Monitoring
Treatment (other, NOS, onsite)
06 OU 05 RA AREA: WHEELER-OSGOOD SOURCE CONTROL No decision document
07 OU 05 RA AREA: HEAD OF THEA FOSS SOURCE CNTRL No decision document
08 OU 05 RA AREA: MOUTH OF THEA FOSS SOURCE CNTL No decision document
09 OU 05 RA AREA: MIDDLE WATERWAY SOURCE CONTROL No decision document
10 OU 01 RA AREA: ST. PAUL SEDIMENTS (DELETED) No decision document
11 OU 01 RA AREA: SITCUM SEDIMENTS No decision document
12 OU 01 RA AREA: MOUTH OF HYLEBOS SEDIMENTS No decision document
13 OU 01 RA AREA: MOUTH THEA FOSS/WHEELER OSGOOD SED No decision document
14 OU 01 RA AREA: HEAD OF THEA FOSS SEDIMENTS No decision document
17 OU 01 RA AREA: MOUTH OF MIDDLE WATERWAY SED.S No decision document
18 OU 08 RA AREA: PUYALLUP LAND CLAIM No decision document
19 OU 06 ASARCO SEDIMENT AND GROUNDWATER Record of Decision
July 14, 2000
Cap (exsitu)
Disposal
Excavation
Institutional Controls
Monitoring
Other (NOS)
20 OU 02 ASARCO SMELTER REMEDIATION Record of Decision
March 24, 1995
Cap (engineered cap)
Containment (other, NOS, onsite)
Disposal (offsite)
Drainage/Erosion Control (other, NOS)
Institutional Controls
Monitoring
Physical Separation (exsitu)
20 OU 02 ASARCO SMELTER REMEDIATION Explanation of Significant Differences
July 02, 1996
ESD - Nonfundamental Change (other)
20 OU 02 ASARCO SMELTER REMEDIATION Explanation of Significant Differences
September 27, 2018
Data not available
21 OU 07 ASARCO SMELTER DEMOLITION Record of Decision
December 31, 1990
Decontamination
Demolition
Disposal (offsite)
Drainage/Erosion Control (ditch)
Dust Suppression
Incineration (onsite)
Recycling (offsite)
Storage (temporary, onsite)
22 OU 04 RUSTON/NORTH TACOMA YARD REMEDIATION Record of Decision
June 16, 1993
Cap (engineered cap)
Containment (other, NOS, onsite)
Cover (soil)
Disposal (offsite)
Excavation
Institutional Controls
Revegetation
Storage (temporary, onsite)
22 OU 04 RUSTON/NORTH TACOMA YARD REMEDIATION Explanation of Significant Differences
November 29, 1993
Storage (temporary, onsite)
23 OU 03 TACOMA TAR PITS Record of Decision
December 30, 1987
Cap (engineered cap)
Discharge (other, NOS)
Drainage/Erosion Control (other, NOS)
Excavation
Institutional Controls
Monitoring
Pumping
Solidification/Stabilization (exsitu, onsite)
Treatment (other, NOS, exsitu, onsite)
23 OU 03 TACOMA TAR PITS Explanation of Significant Differences
November 01, 1991
Consolidate (onsite)
Solidification/Stabilization (exsitu, onsite)
23 OU 03 TACOMA TAR PITS Explanation of Significant Differences
May 09, 1995
Data not available
25 OU 01 RA AREA: HEAD OF HYLEBOS SEDIMENTS No decision document
26 OU 01 RA AREA: A & B MIDDLE WATERWAY SEDIMENT No decision document

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