Colorado & North River Apartments
Site Description
An Environmental Site Assessment conducted in 1996 indicated the property was an orchard in the 1940s. It was vacant from the 1950s until the 1990s. In 1999, an apartment building was constructed at the Site.
In August 1997, soil sampling was conducted. Samples were collected from depths ranging from 2 to 9 inches below ground surface (bgs). All soil samples were analyzed for arsenic. The sample with the highest level of arsenic was then selected to be analyzed for lead.
Laboratory analysis indicated concentrations of 270 parts per million (ppm) arsenic and 1100 ppm lead. In addition, Toxicity Characteristic Leaching Procedure (TLCP) was completed for the same soil sample to whether or not it designated as a dangerous waste. TCLP analytical results were reported below the Washington State dangerous waste values.
Cleanup Activities
In 1999, restrictive covenants were recorded for the two tax parcels that make up the Site.
Cleanup Complete
Periodic Review
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
The Site continues to be occupied by the four apartment buildings that make up the Colorado and North River Apartment complex. Asphalt, building structures and a clean soil cover continue to serve as a cap for the Site and eliminate the human exposure pathways (ingestion, contact) to contaminated soils. Based upon the Site visits in April 2011, June 2016, and February 2021, no repair, maintenance, or contingency actions have been required.
The Restrictive Covenants for the Site were recorded and remain active. The Restrictive Covenants prohibit activities that will result in the release of contaminants contained as part of the cleanup without Ecology’s approval, and prohibit any use of the property that is inconsistent with the Covenant. These covenants serve to assure the long-term integrity of the surface cover.
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.
Institutional Controls 2
Environmental Covenant
Restrictions/Requirements
- Ongoing Maintenance of Remedy
- Prohibit Soil Disturbance
- Restrict Land Use
Restricted Media
- Soil
Environmental Covenant
Restrictions/Requirements
- Ongoing Maintenance of Remedy
- Prohibit Soil Disturbance
- Restrict Land Use
Restricted Media
- Soil
Documents 9
Legal 2
Document Title | Document Date | Document Type |
North River Apts RC | 8/12/1999 | Environmental Covenant; Alternative Mechanism |
Colorado Apts RC | 8/12/1999 | Environmental Covenant; Alternative Mechanism |
Technical Reports 5
Document Title | Document Date | Document Type |
Colorado & North River Apartments - Notice of 3rd Periodic Review | 11/15/2021 | Site Specific Administrative Document - other (Administrative correspondence) |
Colorado & North River February 2021 Periodic Review | 2/1/2021 | Periodic Review (5 Year) |
Colorado & North River June 2016 Periodic Review | 6/1/2016 | Periodic Review (5 Year) |
Colorado & North River June 2011 Periodic Review | 6/1/2011 | Periodic Review (5 Year) |
Colorado and North River Apartments Independent Remedial Action Rpt | 10/2/1998 | Independent Reports |
Voluntary Cleanup Program 2
Document Title | Document Date | Document Type |
North River Apts VCP Opinion – No Further Action | 6/9/1999 | VCP Opinion on Site Cleanup – NFA |
Colorado Apts VCP Opinion – No Further Action | 6/9/1999 | VCP Opinion on Site Cleanup – NFA |
Places to see print documents
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Central Regional Office1250 W Alder StUnion Gap, 98903-0009Please schedule an appointment to view print documents at this location.
Contaminants 1
Contaminant Type | Soil |
Groundwater |
Surface Water |
Air |
Sediment |
Bedrock |
---|---|---|---|---|---|---|
Metals - Metals Priority Pollutants | RA |
- S
- Suspected
- C
- Confirmed Above Cleanup Levels
- B
- Below Cleanup Levels
- RA
- Remediated-Above
- RB
- Remediated-Below
- R
- Remediated