Spokane County Sewer Operations Center

12107 E Empire Ave Spokane Valley, Spokane County
Facility Site ID: 11518 Cleanup Site ID: 12444

More about cleanup

Cleanup Complete

The asphalt cap in 2024.
The asphalt cap in 2024.
Ecology has determined no further action is required at the Spokane County Sewer Operations Center following the construction of engineered controls and filing of an environmental covenant.

Sixty-four soil samples were collected to delineate the extent of arsenic-contaminated soils at the site. Structures in the subsurface did not allow for complete excavation of all contaminated soils, so a three-inch asphalt cap was installed over clean gravel to prevent direct contact to contaminated soils, minimize leaching and migration of contaminants to groundwater, and minimize the potential for airborne contaminants. An environmental covenant was recorded with Spokane County to ensure the cap is protected and restrict future land use.

Periodic Reviews

The drainage swale in 2024.
The drainage swale in 2024.
We completed the first periodic review in 2024, and found the cleanup continues to protect people and animals from contacting remaining soil contamination. The asphalt cap and drainage swale are in good condition. The site use remains the same.

We will complete the next review in five years.

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 #: 6758082
County Recording Date: 11/6/2018

Restrictions/Requirements

  • Prohibit Soil Disturbance
  • Restrict Land Use

Restricted Media

  • Soil
Places to see print documents
Legal 1
Document Title Document Date Document Type
Spokane County Sewer Operations Center - Environmental Covenant 6758082 11/6/2018 Environmental Covenant; Alternative Mechanism
Technical Reports 1
Document Title Document Date Document Type
Periodic Review: Spokane County Sewer Operations Center 8/30/2024 Periodic Review (5 Year)
Voluntary Cleanup Program 1
Document Title Document Date Document Type
Spokane County Sewer Operations Center - VCP Opinion on Site Cleanup- No Further Action 1/8/2019 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 1

Contaminant Type
Soil
Groundwater
Surface Water
Air
Sediment
Bedrock
Metals - Arsenic RA
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.