Facility Site ID: 1304 Cleanup Site ID: 3653

Public Comment Period September 22, 2022-October 23, 2022

Ecology Proposes Removing the Site from the Hazardous Sites List

Ecology invites your comment on removing the Sumner National Auto Parts cleanup site from the Hazardous Sites List. We will consider comments before deciding to remove the site from the list. After the comment period ends, Ecology will post responses to the comments on this webpage.

In 2022, Ecology reviewed conditions at the site and determined that no further cleanup actions are needed because the site meets state cleanup standards. 

When Ecology first learned about contamination at the site, we ranked the site's relative risk to human health and the environment based on contamination and location of the site. The site is about a half mile from municipal water supply wells.

When a cleanup site is ranked, we put the site on the state's Hazardous Sites List. Once a ranked site is cleaned up, a public comment period is required before a site can be removed from the list. 

A fact sheet briefly summarizes conditions at the site and how to submit comments.

Site Description

Excavating contaminated soil.
Excavating contaminated soil.

The site is about 1.5 acres in an area of mixed residential, commercial, and undeveloped properties. It was an auto supply store and an engine rebuild and metal machine shop. The building storage/warehouse was constructed in 1979. A portion of the property is paved with asphalt. Other areas are soil and gravel over soil.

Cleanup

All done. The excavation is backfilled with clean soil.
All done. The excavation is backfilled with clean soil.

Leaks of hazardous chemicals into the soil were likely caused by cleaning and refurbishing engines on a concrete pad, where fluids pooled and spread into the soil.

Contaminants in soil and groundwater included:

  • Petroleum hydrocarbons.
  • BTEX (benzene, toluene, ethylbenzene, and xylene).
  • PAHs (polycyclic aromatic hydrocarbons).
  • Metals.
  • Organic solvents.

Soil excavations in 2017-2018 and 2021 removed about 513 tons of contaminated soil from the site. After the contaminated soil was removed, tests confirmed that contaminant concentrations were below state cleanup levels.

Groundwater monitoring wells were installed in and near areas where the contaminated soil was removed. Groundwater was tested periodically and results confirmed that contaminants were either not present in groundwater or present at concentrations below state cleanup levels.  

Household and public drinking water wells are not likely to have been affected by contamination at the site. 

In February 2022, Ecology determined that no further cleanup action is necessary because the cleanup meets state standards. With the cleanup completed, we propose removing the site from the Hazardous Sites List. 

Monitoring Groundwater

Drilling to install a groundwater monitoring well.
Drilling to install a groundwater monitoring well.
Groundwater monitoring well used to test groundwater conditions.
Groundwater monitoring well used to test groundwater conditions.
Public Information 1
Document Title Document Date Document Type
Sumner National Auto Parts remove from HSL fact sheet 8/25/2022 Fact Sheet\Public Notices
State Environmental Policy Act 1
Document Title Document Date Document Type
Sumner National Auto Parts - Ecology Comments on Determination of Nonsignificance 4/3/2017 SEPA Documents
Technical Reports 4
Document Title Document Date Document Type
Sumner National Auto Parts - Independent Remedial Action Report 5/19/2021 Site Specific Technical Document - other
Sumner National Auto Parts Independent Remedial Action Report 9/3/2020 Remedial Action Report
Sumner National Auto Parts - Groundwater Monitoring Report 1/16/2019 Groundwater Monitoring Report
Sumner National Auto Parts - Independent Remedial Cleanup Action Work Plan 5/23/2017 Interim Action Documents
Voluntary Cleanup Program 9
Document Title Document Date Document Type
Sumner National Auto Parts - SW1729 - Site No Further Action 2/8/2022 VCP Opinion on Site Cleanup – NFA
Sumner National Auto Parts - Site Manager Change Letter 6/14/2021 VCP Administrative Document
Sumner National Auto Parts - SW1729 - VCP Acceptance 9/23/2020 VCP Administrative Document
Sumner National Auto Parts - SW1729 - VCP Agreement 9/10/2020 VCP Administrative Document
Sumner National Auto Parts - SW1729 - VCP Application 9/10/2020 VCP Administrative Document
Sumner National Auto Parts - SW1547 - VCP Project Termination 3/25/2019 Voluntary Cleanup Program Opinion – Other
Sumner National Auto Parts - SW1547 - VCP Site Status Request 12/12/2018 Voluntary Cleanup Program Opinion – Other
Sumner National Auto Parts - SW1547 - Site FA 7/12/2017 Voluntary Cleanup Program Opinion – Other
Sumner National Auto Parts - SW1547 - Acceptance of VCP Application 9/9/2016 Voluntary Cleanup Program Opinion – Other
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

  • Southwest Regional Office
    300 Desmond Dr SE
    Lacey, 98503-1274
    Please schedule an appointment to view print documents at this location.
  • Sumner Public Library
    1116 Fryar Avenue
    Sumner, 98390
    This location may only have print documents available during open comment periods.

Contaminants 5

Contaminant Type
Soil
Groundwater
Surface Water
Air
Sediment
Bedrock
Halogenated Organics - Halogenated Organics RB B
Metals - Metals Priority Pollutants RB B
Non-Halogenated Organics - Petroleum Products-Unspecified RB B
Non-Halogenated Organics - Non-Halogenated Solvents RB B
Non-Halogenated Organics - Polycyclic Aromatic Hydrocarbons B B
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.