Chevron 209335
Facility Site ID:
70996824
Cleanup Site ID:
6537
Site Status - December 2020
Last updated: January 29, 2021
The Department of Ecology (Ecology) negotiated a legal agreement called an Agreed Order (AO) with Chevron Environmental Management Company (CEMC) and Stone Way Apartments LLC (Stone Way) for the Chevron 209335 cleanup site (Site). The AO names CEMC and Stone Way as Potentially Liable Persons (PLPs) and requires them to investigate the site and develop cleanup alternatives, in a document called a Remedial Investigation /Feasibility Study (RI/FS) Report, and to develop a plan based on that report, called a draft Cleanup Action Plan (dCAP).
Ecology held a public comment period and two public meetings on the following documents from December 7, 2020-January 20, 2021.
• Agreed Order – requires the PLPs to investigate environmental conditions, complete a RI/FS Report that presents the results of the investigation and an evaluation of the cleanup alternatives. The dCAP describes how the selected cleanup alternative will be performed.
• Public Participation Plan – describes how Ecology informed the community about Site activities and opportunities to be involved in the cleanup process.
Since the close of the public comment period, Ecology determined no significant changes needed to be made to these documents. They are now finalized and are available for review using the link on the right.
View a summary of the December 7, 2020 - January 20, 2021 comment period.
The Department of Ecology (Ecology) negotiated a legal agreement called an Agreed Order (AO) with Chevron Environmental Management Company (CEMC) and Stone Way Apartments LLC (Stone Way) for the Chevron 209335 cleanup site (Site). The AO names CEMC and Stone Way as Potentially Liable Persons (PLPs) and requires them to investigate the site and develop cleanup alternatives, in a document called a Remedial Investigation /Feasibility Study (RI/FS) Report, and to develop a plan based on that report, called a draft Cleanup Action Plan (dCAP).
Ecology held a public comment period and two public meetings on the following documents from December 7, 2020-January 20, 2021.
• Agreed Order – requires the PLPs to investigate environmental conditions, complete a RI/FS Report that presents the results of the investigation and an evaluation of the cleanup alternatives. The dCAP describes how the selected cleanup alternative will be performed.
• Public Participation Plan – describes how Ecology informed the community about Site activities and opportunities to be involved in the cleanup process.
Since the close of the public comment period, Ecology determined no significant changes needed to be made to these documents. They are now finalized and are available for review using the link on the right.
View a summary of the December 7, 2020 - January 20, 2021 comment period.
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Site Background
The Site is located at 1215 N. 45th Street, Seattle, WA 98103 (Property). The Property is currently owned and operated by Stone Way as a mixed-use affordable housing building.
A service station operated at the Property from at least 1935. Standard Oil Company (Standard) (a predecessor of Chevron U.S.A. Inc.) purchased the Property in 1954 and operated a gasoline service station at the Property until the removal of the service station building and service garage in 1969. Standard sold the Property in 1978 to the Seattle Housing Authority (SHA). The SHA then sold the Property to Housing Resources Group (HRG) in 2005, which immediately transferred ownership of the Property to Stone Way. The Property has since been developed into a four-story, mixed-use retail/residential building with an underground parking garage.
Previous Cleanup Work
2005: The Property was excavated, and impacted soil was removed to a depth of 13 to 18 feet below the original grade. In addition, a total of 20 large-diameter bucket auger borings were drilled to approximately 42 feet below the original ground surface to remove deep
petroleum-hydrocarbon impacted soil. Approximately 2,490 tons of soil were removed and backfilled with clean soil or control-density fill (CDF). Five underground storage tanks were removed from the Property as well. The underground parking garage is next to North 45th Street, Stone Way North and a utility corridor that prevented further excavation. Additional groundwater monitoring wells were installed in 2005.
2005 – 2018: Groundwater samples were collected semi-annually through 2018. Additionally, light non-aqueous phase liquids (LNAPL, or petroleum products that float on top of groundwater) were removed from one monitoring well (bi-weekly to daily) from February 2006 to August 2006. A surfactant injection for enhanced LNAPL recovery occurred in 2013.
2018 – Today: LNAPL continued to be observed at the Site through 2018 in one groundwater monitoring well. The remaining petroleum contamination does not likely pose a health risk to the businesses or residents of the building due to the presence of a below ground parking garage, garage ventilation system and a protective vapor barrier beneath the building. A Vapor Intrusion Assessment (VIA, or study of the air in the garage) will be conducted during the remedial investigation to confirm this understanding.
Chemicals of Concern
Chemicals remaining in soil and groundwater include:
• Petroleum products (Gasoline, Diesel, Oil-range Total Petroleum Hydrocarbons)
• Benzene, Toluene, Ethyl-Benzene, and Xylene (BTEX)
A service station operated at the Property from at least 1935. Standard Oil Company (Standard) (a predecessor of Chevron U.S.A. Inc.) purchased the Property in 1954 and operated a gasoline service station at the Property until the removal of the service station building and service garage in 1969. Standard sold the Property in 1978 to the Seattle Housing Authority (SHA). The SHA then sold the Property to Housing Resources Group (HRG) in 2005, which immediately transferred ownership of the Property to Stone Way. The Property has since been developed into a four-story, mixed-use retail/residential building with an underground parking garage.
Previous Cleanup Work
2005: The Property was excavated, and impacted soil was removed to a depth of 13 to 18 feet below the original grade. In addition, a total of 20 large-diameter bucket auger borings were drilled to approximately 42 feet below the original ground surface to remove deep
petroleum-hydrocarbon impacted soil. Approximately 2,490 tons of soil were removed and backfilled with clean soil or control-density fill (CDF). Five underground storage tanks were removed from the Property as well. The underground parking garage is next to North 45th Street, Stone Way North and a utility corridor that prevented further excavation. Additional groundwater monitoring wells were installed in 2005.
2005 – 2018: Groundwater samples were collected semi-annually through 2018. Additionally, light non-aqueous phase liquids (LNAPL, or petroleum products that float on top of groundwater) were removed from one monitoring well (bi-weekly to daily) from February 2006 to August 2006. A surfactant injection for enhanced LNAPL recovery occurred in 2013.
2018 – Today: LNAPL continued to be observed at the Site through 2018 in one groundwater monitoring well. The remaining petroleum contamination does not likely pose a health risk to the businesses or residents of the building due to the presence of a below ground parking garage, garage ventilation system and a protective vapor barrier beneath the building. A Vapor Intrusion Assessment (VIA, or study of the air in the garage) will be conducted during the remedial investigation to confirm this understanding.
Chemicals of Concern
Chemicals remaining in soil and groundwater include:
• Petroleum products (Gasoline, Diesel, Oil-range Total Petroleum Hydrocarbons)
• Benzene, Toluene, Ethyl-Benzene, and Xylene (BTEX)
Ecology's Cleanup Process
The Model Toxics Control Act (MTCA) is Washington’s environmental cleanup law. It provides requirements for contaminated site cleanup and sets standards that protect human health and the environment. Ecology enacts the MTCA and oversees cleanups.
The MTCA site cleanup process is completed in steps over a variable timeline (see graphic below).
The MTCA site cleanup process is completed in steps over a variable timeline (see graphic below).
Documents 103
Legal 7
| Document Title | Document Date | Document Type |
| Chevron 209335 - Agreed Order DE19432 | 2/2/2021 | Agreed Order |
| Chevron 209335 - Public Review Draft Agreed Order | 11/4/2020 | Agreed Order |
| Chevron 209335 - Bellwether Housing Notice of Determination PLP | 8/29/2018 | Final Potentially Liable Person Status Letter |
| Chevron 209335 - PLP Status Letter to Chevron | 5/23/2017 | Final Potentially Liable Person Status Letter |
| Chevron 209335 - PLP Status Letter to Stone Way Apts | 5/2/2017 | Final Potentially Liable Person Status Letter |
| Chevron 209335 - Stone Way Apartments LLC Notice of Potential Liability letter | 2/8/2017 | Early Notice Letter |
| Chevron 209335 - Notice of Potential Liability | 10/1/2015 | Early Notice Letter |
Outreach Information 16
Technical Reports 71
Voluntary Cleanup Program 9
| Document Title | Document Date | Document Type |
| Chevron 209335 - Seattle Housing Authority Change of Contact Information | 5/10/2017 | VCP Administrative Document |
| Chevron 209335 - NW2220 VCP Termination letter | 5/3/2017 | VCP Administrative Document |
| Chevron 209335 - Receipt of VCP Application | 11/23/2009 | VCP Administrative Document |
| Chevron 209335 - NW2220 VCP Agreement | 11/20/2009 | VCP Administrative Document |
| Chevron 209335 - NW2220 VCP Application | 11/5/2009 | VCP Administrative Document |
| Chevron 209335 - NW1415 VCP Termination Letter | 10/14/2009 | VCP Administrative Document |
| Chevron 209335 - VCP Status Request Letter | 5/4/2009 | VCP Administrative Document |
| Chevron 209335 - Receipt of VCP Application | 3/10/2005 | VCP Administrative Document |
| Chevron 209335 - NW1415 VCP Application | 2/8/2005 | VCP Administrative Document |
There may be more documents related to this site. To obtain documents not available electronically, you will need to make a public records request.
Places to see print documents
-
Northwest Regional Office15700 Dayton Ave NShoreline, 98133Please schedule an appointment to view print documents at this location.
Contaminants 6
| Contaminant Type | Soil |
Groundwater |
Surface Water |
Air |
Sediment |
Bedrock |
|---|---|---|---|---|---|---|
| Non-Halogenated Organics - Non-Halogenated Solvents | C | C | ||||
| Non-Halogenated Organics - Methyl tertiary-butyl ether | C | |||||
| Metals - Lead | C | |||||
| Non-Halogenated Organics - Benzene | C | C | ||||
| Non-Halogenated Organics - Petroleum-Diesel | C | C | ||||
| Non-Halogenated Organics - Petroleum-Gasoline | C | C |
- S
- Suspected
- C
- Confirmed Above Cleanup Levels
- B
- Below Cleanup Levels
- RA
- Remediated-Above
- RB
- Remediated-Below
- R
- Remediated
This contaminant list was based on our best information at the time it was entered. It may not reflect current conditions at the site.