Facility Site ID: 42896988 Cleanup Site ID: 6066

Public Comment Period October 31, 2022-November 29, 2022

Draft Periodic Review Report Available

Ecology invites you to review and comment on the draft periodic review report. We visited the site September 29, 2022, and found that the cleanup actions remain effective.

Review the draft report
  • Online: Periodic Review Report
  • At Ecology's Eastern Regional Office - N. 4601 Monroe St., Spokane, WA. Please call 509-329-3415 to make an appointment.
Submit comments via mail or email by November 29:

Ted Uecker, ted.uecker@ecy.wa.gov
N. 4601 Monroe St., Spokane, WA 99205-1265
Or use the online comment form

Next steps

Ecology will review all comments received during the comment period and revise the report if needed. If no significant changes are made, the periodic review will become final. If significant changes are made, an additional public comment period will be held. We will hold a public meeting if 10 or more people request it.

Site History

The site is now used for vehicle storage (2022 photo).
The site is now used for vehicle storage (2022 photo).

The site was formerly a service station that was demolished in 1990. Two 10,000-gallon underground storage tanks, a heating oil tank, waste oil tank, and the pump islands were removed. Contaminated soil from the tank excavations was taken to a landfill.

In 1994, nine groundwater monitoring wells were installed. Sample results showed benzene, gasoline, and diesel in groundwater required cleanup.

In 2003, 17 test pits were dug to find the extent of contamination. All soil sample results met state standards, except for two.

In 2012, part of a retaining wall was demolished and replaced. About 168 cubic yards of contaminated soil were removed during the process. Ten additional monitoring wells were installed, and groundwater was monitored through 2013. Sampling was stopped when results from the final four quarterly events met state standards.

Contaminated soil remains next to the retaining wall along the eastern side of the property and at a location along G Street. Ecology filed an Environmental Covenant to document the remaining contamination and restrict property use to protect people from being exposed to it.

Periodic reviews
Ecology visited the site September 29, 2022, to complete a periodic review. We found that the cleanup remains effective and the property owners are following the restrictions in the covenant.

Voluntary Cleanup Program

This site was cleaned up under our Voluntary Cleanup Program, which provides technical help to owners of contaminated sites.

Voluntary Cleanup Program customers pay fees to cover our costs for technical help and reviewing cleanup reports. Sites in this program must meet the same cleanup standards as the sites Ecology manages under legal orders.

Site use restrictions called institutional controls are in effect

Institutional controls can be fences, signs, or restrictions on how the property is used. For instance, an institutional control may prohibit installing drinking water wells or disturbing a protective cap that isolates contamination. These restrictions keep the contamination contained and keep people from being exposed to the contamination. The controls are usually listed in environmental covenants recorded with the county.

Periodic reviews are required when institutional controls are required at a site. Ecology conducts reviews to make sure the controls remain effective and the cleanup still protects human health and the environment. We conduct periodic reviews about every five years.

Environmental Covenant

County Recording #: 6492268
County Recording Date: 5/2/2016

Covenant Restrictions

  • Prohibit Soil Disturbance

Media Restrictions

  • Soil
Legal 1
Document Title Document Date Document Type
Unocal SS 2938 5/2/2016 Environmental Covenant; Alternative Mechanism
Technical Reports 1
Document Title Document Date Document Type
Periodic Review: Unocal SS 2938 10/20/2022 Periodic Review (5 Year)
Voluntary Cleanup Program 1
Document Title Document Date Document Type
Unocal SS 2938 - VCP Opinion on Site Cleanup - No Further Action 5/6/2016 VCP Opinion on Site Cleanup – NFA
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

  • Eastern Regional Office
    N 4601 Monroe St
    Spokane, 99205-1265
    Please schedule an appointment to view print documents at this location.

Contaminants 7

Contaminant Type
Surface Water
Non-Halogenated Organics - Non-Halogenated Solvents B
Non-Halogenated Organics - Polycyclic Aromatic Hydrocarbons RA
Non-Halogenated Organics - Methyl tertiary-butyl ether B
Non-Halogenated Organics - Benzene RB RB
Non-Halogenated Organics - Petroleum-Diesel RB RB
Non-Halogenated Organics - Petroleum-Gasoline RB RB
Non-Halogenated Organics - Petroleum-Other RB B
Confirmed Above Cleanup Levels
Below Cleanup Levels
This contaminant list was based on our best information at the time it was entered. It may not reflect current conditions at the site.