Modera River Trail
Status
This Site was cleaned up under the Voluntary Cleanup Program (VCP).
The site was issued a Site No Further Action Letter on September 28, 2023. The No Further Action determination depends on the post-cleanup controls and monitoring specified in the letter and in an environmental covenant.
Site Background
The Site is located on the southeast corner of the intersection of NE 85th Street and 158th Avenue NE in downtown Redmond. The Site is developed with a six-story mixed-used building in 2020. Prior to the construction of the current building, the Site was occupied by two office buildings, located on the northwest and southeast potion of the Site, respectively.
During building demolition in 2019, a total of approximately 50 timber piles were discovered beneath the former office building on the northwest portion of the Site. These timber piles are approximately 15 feet in length and 8 inches in diameter. The timber piles were preserved with creosote, which consists of polycyclic aromatic hydrocarbons (PAHs). Soil near the timber piles is contaminated with PAHs.
Cleanup Conducted
Since 2019, environmental investigations were conducted to define the lateral and vertical extent of the soil contamination. Soil contamination is confined within the upper 6 feet beneath the northwest portion of the current building.
Groundwater monitoring wells were installed along the north boundary of the Site. Groundwater samples were collected from the monitoring wells and indicated that groundwater quality is not impacted by the soil contamination.
A vapor barrier is installed beneath the current building to mitigation potential risk that may be caused by hazardous vapor migrating to the building. Indoor air samples were also collected at two locations inside the first floor of the current building. The air sampling results indicated that the indoor air quality is not impacted by the contamination beneath the building.
The timber piles and soil contamination are located beneath a cap, consisting of the current building structure, a vapor barrier, and concrete floor. This cap prevents contamination to be exposed to human health and environment. Restrictions are in place to ensure the containment of contaminated soil is maintained. The restrictions are documented in an environmental covenant.
Contaminants Of Concern
Naphthalenes and carcinogenic polycyclic aromatic hydrocarbons (cPAHs) into the soil.
Model Toxics Control Act
The MTCA site cleanup process is completed in steps over a variable timeline.
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Counties: Island, King, Kitsap, San Juan, Skagit, Snohomish, and Whatcom
Email: nwroerts@ecy.wa.gov
Phone: 206-594-0000
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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 1
Environmental Covenant
Restrictions/Requirements
- Control Stormwater
- Control Vapor/Gas
- Maintain/Protect Monitoring System
- Ongoing Maintenance of Remedy
- Prohibit New Building Construction
- Prohibit Removal or Alteration of Existing Buildings
- Prohibit Soil Disturbance
- Restrict All Ground Water Extraction/Well Installation
- Restrict Domestic Ground Water Extraction/Well Installation
Restricted Media
- Air
- Groundwater
- Soil
Documents 15
Legal 1
| Document Title | Document Date | Document Type |
| Modera River Trail - NW3292 Environmental Covenant | 8/4/2023 | Environmental Covenant; Alternative Mechanism |
Technical Reports 11
Voluntary Cleanup Program 3
| Document Title | Document Date | Document Type |
| Modera River Trail - NW3292 NFA letter | 9/28/2023 | VCP Opinion on Site Cleanup – NFA |
| Modera River Trail—NW3292 FA Letter | 1/29/2021 | VCP Opinion on Site Cleanup – Other |
| Modera River Trail - NW3292 VCP Acceptance Letter & Application Forms | 12/2/2020 | VCP Administrative Document |
Places to see print documents
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Northwest Regional Office15700 Dayton Ave NShoreline, 98133Please schedule an appointment to view print documents at this location.
Contaminants 1
| Contaminant Type | Soil |
Groundwater |
Surface Water |
Air |
Sediment |
Bedrock |
|---|---|---|---|---|---|---|
| Non-Halogenated Organics - Polycyclic Aromatic Hydrocarbons | RB | B |
- S
- Suspected
- C
- Confirmed Above Cleanup Levels
- B
- Below Cleanup Levels
- RA
- Remediated-Above
- RB
- Remediated-Below
- R
- Remediated