Block 38 West
Current Status
Ecology has reviewed and considered all comments received on the draft Interim Action Work Plan. Based on Ecology’s evaluation of the comments, no changes were necessary in the document, and it has been finalized.
View the Interim Action Work Plan
View the Response to Comments
Work will now begin on the Remedial Investigation and Feasibility Study for determining a final cleanup action for the site. See the graphic below and visit Ecology’s cleanup process webpage to learn more about Washington’s formal cleanup process.
Fact sheets
Block 38 West Fact sheet - English
Block 38 West Fact sheet - Español
Block 38 West Fact sheet - 訊息中文版
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Site Information
Site Location
The Block 38 West Site is located in the South Lake Union neighborhood of Seattle. The property known as Block 38 West is generally located at 500-536 Westlake Avenue North, is approximately 1.06 acres in size, and consists of three parcels (Property).
Site History
Past uses of the Property include a lumber storage yard, a blacksmith shop, warehouse storage, and retail and commercial operations and associated parking. The Property’s structures have been demolished as part of planned redevelopment of the Property. The redevelopment includes construction of a multistory mixed-use building with a preliminary design for a 12-story office building above street level and four levels of parking below street level.
Contamination
Previous investigations at the Site found the following in soil
and/or groundwater:
• petroleum hydrocarbons (as diesel-range and oil-range organics)
• polycyclic aromatic hydrocarbons (PAHs), including naphthalenes and
carcinogenic PAHs (cPAHs)
• benzene
These contaminants were found at levels that exceed allowable standards under the state’s cleanup law, the Model Toxics Control Act (MTCA Chapter 70.015D RCW), and therefore must be addressed during the cleanup action. Cis-1,2-dichloroethene was also found in the groundwater but at concentrations below applicable cleanup levels under MTCA.
General Cleanup Process
Documents 85
Legal 5
Document Title | Document Date | Document Type |
Block 38 West Agreed Order Final April 2020 | 4/20/2020 | Agreed Order |
Block 38 West Agreed Order Public Review Draft - March 2020 | 2/19/2020 | Agreed Order |
Block 38 West - PLP Status Letter | 9/5/2019 | Final Potentially Liable Person Status Letter |
Block 38 West - Early Notice/ Preliminary PLP Letter | 8/13/2019 | Early Notice Letter |
Block 38 West - Early Notice Letter & Preliminary Determination of Liability | 8/13/2019 | Early Notice Letter |
Public Information 8
Document Title | Document Date | Document Type |
Response to Comments Block 38 West IAWP | 1/22/2021 | Responsiveness Summary |
Block 38 West Fact Sheet Interim Action Spanish - December 2020 | 12/16/2020 | Fact Sheet\Public Notices |
Block 38 West Fact Sheet Interim Action Chinese - December 2020 | 12/16/2020 | Fact Sheet\Public Notices |
Block 38 West Fact Sheet Interim Action - December 2020 | 12/16/2020 | Fact Sheet\Public Notices |
Block 38 West Fact Sheet Legal Agreements - March 2020 CHINESE | 3/12/2020 | Fact Sheet\Public Notices |
Block 38 West Fact Sheet Legal Agreements - March 2020 SPANISH | 3/12/2020 | Fact Sheet\Public Notices |
Block 38 West Fact Sheet Legal Agreements - March 2020 | 3/12/2020 | Fact Sheet\Public Notices |
Block 38 West Public Participation Plan - March 2020 | 3/12/2020 | Public Participation Plan |
State Environmental Policy Act 2
Document Title | Document Date | Document Type |
Block 38 West - Ecology SEPA Comment Letter | 5/16/2019 | SEPA Documents |
Block 38 West - Addendum to the FEIS | 4/29/2019 | SEPA Documents |
Technical Reports 70
Contaminants 5
Contaminant Type | Soil |
Groundwater |
Surface Water |
Air |
Sediment |
Bedrock |
---|---|---|---|---|---|---|
Non-Halogenated Organics - Polycyclic Aromatic Hydrocarbons | C | |||||
Non-Halogenated Organics - Benzene | C | |||||
Non-Halogenated Organics - Petroleum-Diesel | C | |||||
Non-Halogenated Organics - Petroleum-Gasoline | C | |||||
Non-Halogenated Organics - Petroleum-Other | C |
- S
- Suspected
- C
- Confirmed Above Cleanup Levels
- B
- Below Cleanup Levels
- RA
- Remediated-Above
- RB
- Remediated-Below
- R
- Remediated