100 Orondo School Rd, Orondo, WA 98843

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The Orondo Elementary School was cleaned up as part of the Area-Wide Soil Contamination Project.

Area-wide soil contamination is defined as contamination above state cleanup levels that is dispersed over a large geographic area. The soil contamination in this case is a result of central Washington’s orchard industry. Much of the region consists of current or former orchard land, where long-term pesticide application has taken its toll. Lead arsenate, a pesticide commonly used between the years of 1905 and 1947 to control the codling moth, has been identified as the primary source of increased lead and arsenic concentrations.

Due to their chemical structure, lead and arsenic tend to bond with soil particles and often remain at or near ground surface level for decades, creating an exposure pathway through inhalation and/or ingestion.

Although lead and arsenic are naturally occurring elements, elevated concentrations have been proven to have a negative impact on human health. Young children are generally more susceptible than adults, which is why Ecology has focused remediation efforts on schools.

After a Site Hazard Assessment, the Site was ranked a “4” on the Hazardous Sites List. The Hazardous Sites List is a statewide list of contaminated properties.  Sites can be ranked from a “1” to “5”.  A rank of “1” is the highest level of environmental concern compared to other sites on the List, and a rank of “5” is the lowest.


The cleanup alternative preferred by Ecology consisted primarily of placing clean soil on top of the existing soil, and establishing new grass on this clean soil.  Following cleanup, an environmental covenant was recorded for the property with the Douglas County Assessor. The purpose of the environmental covenant is to provide a permanent legal record of the contamination that remains on the property, and to prevent activities at the site that might disturb or damage the soil cap.


Based on the cleanup completed and environmental covenant in place, Ecology has determined the site does not pose a threat to human health or the environment.  Ecology made a No Further Action determination in 2008. The Site has been removed from the Hazardous Sites List.


Periodic reviews are conducted every 5 years by Ecology for sites that have Environmental Covenants and/or Institutional Controls. The review is intended to examine the effectiveness of cleanup activities and to assure the continued protection of human health and the environment.

Periodic Review Results

Based upon a Site visits, the turf at the school remains in good condition with the exception of areas where it receives concentrated use. The clean soil cap continues to eliminate human and ecological exposure pathways to contaminated soils. Maintenance and repair activities should be conducted where the clean soil cap has been exposed.

An environmental covenant has been recorded for the Site that restricts activities that may expose contaminated soil, and notifies future property owners of contamination remaining at the Site.
Soils cleanup levels have not been met at the Site; however, the cleanup action is determined to comply with cleanup standards at the time of the action, since the long-term integrity of the containment system is ensured and the requirements for containment technologies have been met.



Map showing site location as Douglas County, WA SITE INFORMATION


View Electronic Documents

Cleanup Site Details Report

Facility Site ID: # 9997635

Cleanup Site ID: 5510

Orondo, Douglas County

Status: No Further Action   Get definitions of Status terminology

Document Repositories:

Central Regional Office
1250 W Alder St
Union Gap, 98903-0009