Download - Piers 24 & 25 Sediment Remediation Project Tacoma, Washington or… Adventures in Underpier Capping
![Page 1: Piers 24 & 25 Sediment Remediation Project Tacoma, Washington or… Adventures in Underpier Capping](https://reader035.vdocuments.mx/reader035/viewer/2022081603/568150bd550346895dbedb26/html5/thumbnails/1.jpg)
Piers 24 & 25 Sediment Remediation Project
Tacoma, Washington
or… Adventures in Underpier CappingAdventures in Underpier Capping
Rick Moore, Hart Crowser
WEDA Pacific Chapter ConferenceNovember 5, 2009
![Page 2: Piers 24 & 25 Sediment Remediation Project Tacoma, Washington or… Adventures in Underpier Capping](https://reader035.vdocuments.mx/reader035/viewer/2022081603/568150bd550346895dbedb26/html5/thumbnails/2.jpg)
Acknowledgments• Port of Tacoma• US EPA• US Army Corps of Engineers• Washington State
Department of Ecology• Bergerson Construction• Berger/ABAM
![Page 3: Piers 24 & 25 Sediment Remediation Project Tacoma, Washington or… Adventures in Underpier Capping](https://reader035.vdocuments.mx/reader035/viewer/2022081603/568150bd550346895dbedb26/html5/thumbnails/3.jpg)
Presentation Overview
Project Setting and Background
Commencement Bay CERCLA ActionsHow Did We Get Here? When Will We Be Done?
Remediation ElementsWhy Do These Projects Always Happen in the Winter?
Lessons LearnedThe Good, the Challenged, and the Long-Term.
![Page 4: Piers 24 & 25 Sediment Remediation Project Tacoma, Washington or… Adventures in Underpier Capping](https://reader035.vdocuments.mx/reader035/viewer/2022081603/568150bd550346895dbedb26/html5/thumbnails/4.jpg)
![Page 5: Piers 24 & 25 Sediment Remediation Project Tacoma, Washington or… Adventures in Underpier Capping](https://reader035.vdocuments.mx/reader035/viewer/2022081603/568150bd550346895dbedb26/html5/thumbnails/5.jpg)
Historical Tideflat Filling
![Page 6: Piers 24 & 25 Sediment Remediation Project Tacoma, Washington or… Adventures in Underpier Capping](https://reader035.vdocuments.mx/reader035/viewer/2022081603/568150bd550346895dbedb26/html5/thumbnails/6.jpg)
Commencement Bay Nearshore/ Tideflats Superfund SiteModified From Port of Tacoma Photo Slide
Sitcum
Hylebos
Thea Foss
Middle
St. Paul
Piers 24 & 25 Project
Site
![Page 7: Piers 24 & 25 Sediment Remediation Project Tacoma, Washington or… Adventures in Underpier Capping](https://reader035.vdocuments.mx/reader035/viewer/2022081603/568150bd550346895dbedb26/html5/thumbnails/7.jpg)
CERCLA Background• Commencement Bay/Nearshore
Tideflats Superfund Site– Work Began Mid-1980s– 1989 EPA Record of Decision– 20+ Year Cycle to Complete Remediation
• Piers 24 & 25– Part of Mouth of Hylebos Remedial Action – One of the Last CB/NT Remediation Efforts
![Page 8: Piers 24 & 25 Sediment Remediation Project Tacoma, Washington or… Adventures in Underpier Capping](https://reader035.vdocuments.mx/reader035/viewer/2022081603/568150bd550346895dbedb26/html5/thumbnails/8.jpg)
Site Vicinity and Project Area2006 Aerial
Photo
Source: City of Tacoma
Hylebos Waterway
Blair Waterway
Piers 24 and 25 Project Site
![Page 9: Piers 24 & 25 Sediment Remediation Project Tacoma, Washington or… Adventures in Underpier Capping](https://reader035.vdocuments.mx/reader035/viewer/2022081603/568150bd550346895dbedb26/html5/thumbnails/9.jpg)
Site Contaminants
• PAH, Metals, and PCB Contamination from Historical Shipyard Waste Disposal
• A Convenient Place to Dump Waste
• A Difficult Place to Clean Up
![Page 10: Piers 24 & 25 Sediment Remediation Project Tacoma, Washington or… Adventures in Underpier Capping](https://reader035.vdocuments.mx/reader035/viewer/2022081603/568150bd550346895dbedb26/html5/thumbnails/10.jpg)
1940s Shipyard
Piers 24 & 25 Project Site
![Page 11: Piers 24 & 25 Sediment Remediation Project Tacoma, Washington or… Adventures in Underpier Capping](https://reader035.vdocuments.mx/reader035/viewer/2022081603/568150bd550346895dbedb26/html5/thumbnails/11.jpg)
1946 Aerial Photo
![Page 12: Piers 24 & 25 Sediment Remediation Project Tacoma, Washington or… Adventures in Underpier Capping](https://reader035.vdocuments.mx/reader035/viewer/2022081603/568150bd550346895dbedb26/html5/thumbnails/12.jpg)
Piers 24 & 25 Project Timeline• 1998 to 2000 Remedial Design
• EPA AOC 2002 and CD 2005
• 2000 to 2007 Revise/Finalize Design
• 10/07 and 2/08 Complete Construction
![Page 13: Piers 24 & 25 Sediment Remediation Project Tacoma, Washington or… Adventures in Underpier Capping](https://reader035.vdocuments.mx/reader035/viewer/2022081603/568150bd550346895dbedb26/html5/thumbnails/13.jpg)
Remediation Elements• Embankment Capping on 2V:1H Slopes
• Hot Spot Dredging for As Contamination
• Debris Pile Removal
• Hot Spot PCB Removal
![Page 14: Piers 24 & 25 Sediment Remediation Project Tacoma, Washington or… Adventures in Underpier Capping](https://reader035.vdocuments.mx/reader035/viewer/2022081603/568150bd550346895dbedb26/html5/thumbnails/14.jpg)
A Difficult Place to Work
• Limited Access
• Forest of Pilings
• Steep, Slippery Rock Slopes
![Page 15: Piers 24 & 25 Sediment Remediation Project Tacoma, Washington or… Adventures in Underpier Capping](https://reader035.vdocuments.mx/reader035/viewer/2022081603/568150bd550346895dbedb26/html5/thumbnails/15.jpg)
![Page 16: Piers 24 & 25 Sediment Remediation Project Tacoma, Washington or… Adventures in Underpier Capping](https://reader035.vdocuments.mx/reader035/viewer/2022081603/568150bd550346895dbedb26/html5/thumbnails/16.jpg)
Barge-Mounted Placement of Capping Materials
![Page 17: Piers 24 & 25 Sediment Remediation Project Tacoma, Washington or… Adventures in Underpier Capping](https://reader035.vdocuments.mx/reader035/viewer/2022081603/568150bd550346895dbedb26/html5/thumbnails/17.jpg)
Pier-Mounted Placement of Capping Materials
![Page 18: Piers 24 & 25 Sediment Remediation Project Tacoma, Washington or… Adventures in Underpier Capping](https://reader035.vdocuments.mx/reader035/viewer/2022081603/568150bd550346895dbedb26/html5/thumbnails/18.jpg)
Sand Cap and Armor Rock Placement
![Page 19: Piers 24 & 25 Sediment Remediation Project Tacoma, Washington or… Adventures in Underpier Capping](https://reader035.vdocuments.mx/reader035/viewer/2022081603/568150bd550346895dbedb26/html5/thumbnails/19.jpg)
Sand Cap and Armor Rock Placement
![Page 20: Piers 24 & 25 Sediment Remediation Project Tacoma, Washington or… Adventures in Underpier Capping](https://reader035.vdocuments.mx/reader035/viewer/2022081603/568150bd550346895dbedb26/html5/thumbnails/20.jpg)
Toe Berm Riprap Placement
![Page 21: Piers 24 & 25 Sediment Remediation Project Tacoma, Washington or… Adventures in Underpier Capping](https://reader035.vdocuments.mx/reader035/viewer/2022081603/568150bd550346895dbedb26/html5/thumbnails/21.jpg)
Sand Cap and Armor Rock
![Page 22: Piers 24 & 25 Sediment Remediation Project Tacoma, Washington or… Adventures in Underpier Capping](https://reader035.vdocuments.mx/reader035/viewer/2022081603/568150bd550346895dbedb26/html5/thumbnails/22.jpg)
Lead Line Survey Control
![Page 23: Piers 24 & 25 Sediment Remediation Project Tacoma, Washington or… Adventures in Underpier Capping](https://reader035.vdocuments.mx/reader035/viewer/2022081603/568150bd550346895dbedb26/html5/thumbnails/23.jpg)
Project Area - Post-Capping
![Page 24: Piers 24 & 25 Sediment Remediation Project Tacoma, Washington or… Adventures in Underpier Capping](https://reader035.vdocuments.mx/reader035/viewer/2022081603/568150bd550346895dbedb26/html5/thumbnails/24.jpg)
Shotcrete Application
![Page 25: Piers 24 & 25 Sediment Remediation Project Tacoma, Washington or… Adventures in Underpier Capping](https://reader035.vdocuments.mx/reader035/viewer/2022081603/568150bd550346895dbedb26/html5/thumbnails/25.jpg)
Photo Courtesy of the Port of Tacoma
![Page 26: Piers 24 & 25 Sediment Remediation Project Tacoma, Washington or… Adventures in Underpier Capping](https://reader035.vdocuments.mx/reader035/viewer/2022081603/568150bd550346895dbedb26/html5/thumbnails/26.jpg)
Shotcrete Application
![Page 27: Piers 24 & 25 Sediment Remediation Project Tacoma, Washington or… Adventures in Underpier Capping](https://reader035.vdocuments.mx/reader035/viewer/2022081603/568150bd550346895dbedb26/html5/thumbnails/27.jpg)
Piers 24 & 25 Project Area
![Page 28: Piers 24 & 25 Sediment Remediation Project Tacoma, Washington or… Adventures in Underpier Capping](https://reader035.vdocuments.mx/reader035/viewer/2022081603/568150bd550346895dbedb26/html5/thumbnails/28.jpg)
Debris Pile Removal
![Page 29: Piers 24 & 25 Sediment Remediation Project Tacoma, Washington or… Adventures in Underpier Capping](https://reader035.vdocuments.mx/reader035/viewer/2022081603/568150bd550346895dbedb26/html5/thumbnails/29.jpg)
PCB Hot Spot Removal
![Page 30: Piers 24 & 25 Sediment Remediation Project Tacoma, Washington or… Adventures in Underpier Capping](https://reader035.vdocuments.mx/reader035/viewer/2022081603/568150bd550346895dbedb26/html5/thumbnails/30.jpg)
PCB Hot Spot Removal
![Page 31: Piers 24 & 25 Sediment Remediation Project Tacoma, Washington or… Adventures in Underpier Capping](https://reader035.vdocuments.mx/reader035/viewer/2022081603/568150bd550346895dbedb26/html5/thumbnails/31.jpg)
Lessons Learned – The Good• Construction Methods Successful for
Steep Slope Capping
– Sand Cap 400 to 700 CY/Shift
– Crushed Armor Rock 400 to 600 CY/Shift
– Shotcrete 6 to 10 CY/Shift
• Total Construction Cost $4.6M – Within 1% of Engineering Estimate Excluding
Change Orders
![Page 32: Piers 24 & 25 Sediment Remediation Project Tacoma, Washington or… Adventures in Underpier Capping](https://reader035.vdocuments.mx/reader035/viewer/2022081603/568150bd550346895dbedb26/html5/thumbnails/32.jpg)
The Challenged• PCB Hot Spot and Deeper Debris
Excavation Were Unexpected and Costly
– Difficult Setting to Obtain Good Sampling Data
• 50% Toe Berm Riprap Quantity Over-Run
– Difficult to Estimate Riprap Repose Angle and Settling
![Page 33: Piers 24 & 25 Sediment Remediation Project Tacoma, Washington or… Adventures in Underpier Capping](https://reader035.vdocuments.mx/reader035/viewer/2022081603/568150bd550346895dbedb26/html5/thumbnails/33.jpg)
And The Long Term…• Piers 24 & 25 Cap Performing as Intended
• Remediation Complete:– Sitcum, Milwaukee, St. Paul, Thea Foss/Wheeler Osgood
Waterways, and ASARCO
• Remediation Pending: OXY/Area 5106
• CB/NT In Post-Construction Monitoring – Portions of the Blair and St. Paul Waterways
Delisted/Deleted from NPL
![Page 34: Piers 24 & 25 Sediment Remediation Project Tacoma, Washington or… Adventures in Underpier Capping](https://reader035.vdocuments.mx/reader035/viewer/2022081603/568150bd550346895dbedb26/html5/thumbnails/34.jpg)
Thanks to WEDARick MooreHart [email protected]
m(206) 826-4521
Bill Evans Port of [email protected](253) 593-4563
![Page 35: Piers 24 & 25 Sediment Remediation Project Tacoma, Washington or… Adventures in Underpier Capping](https://reader035.vdocuments.mx/reader035/viewer/2022081603/568150bd550346895dbedb26/html5/thumbnails/35.jpg)
5106 and “OXY” In-Water Areas
![Page 36: Piers 24 & 25 Sediment Remediation Project Tacoma, Washington or… Adventures in Underpier Capping](https://reader035.vdocuments.mx/reader035/viewer/2022081603/568150bd550346895dbedb26/html5/thumbnails/36.jpg)
Commencement Bay Waterways