WA DOT Signals Maintenance
Facility Site ID:
60549963
Cleanup Site ID:
9862
Status Update
Ecology held a comment period from July 19, 2019-August 19, 2019 to delist the Site from the Hazardous Sites List. This Site is now delisted from the Hazardous Sites List.
Site Background
Cleanup Activities
The Washington State Department of Transportation conducted a cleanup action during the UST removal in 2015 that included:
• Excavation of the three USTs and disposal of 562 tons of contaminated soil at a permitted facility;
• Collection of five soil samples at the bottom and sidewalls of the excavation to confirm removal of all contaminated soil. The results from these samples indicated contaminated soil was removed; groundwater was not sampled during the tank removal activities.
An Ecology contractor performed a Supplemental Site Investigation in 2017 to further evaluate the status of the contamination in soil and to assess if groundwater had been impacted. The activities included the installation of ten soil borings for soil and groundwater sampling within the former UST excavation and vicinity. The laboratory results for soil and groundwater did not exceed state cleanup standards. The Supplemental Site Investigation confirmed that the concentrations of petroleum contaminants at the Site do not pose a threat to human health and the environment.
• Excavation of the three USTs and disposal of 562 tons of contaminated soil at a permitted facility;
• Collection of five soil samples at the bottom and sidewalls of the excavation to confirm removal of all contaminated soil. The results from these samples indicated contaminated soil was removed; groundwater was not sampled during the tank removal activities.
An Ecology contractor performed a Supplemental Site Investigation in 2017 to further evaluate the status of the contamination in soil and to assess if groundwater had been impacted. The activities included the installation of ten soil borings for soil and groundwater sampling within the former UST excavation and vicinity. The laboratory results for soil and groundwater did not exceed state cleanup standards. The Supplemental Site Investigation confirmed that the concentrations of petroleum contaminants at the Site do not pose a threat to human health and the environment.
Documents 8
Legal 2
| Document Title | Document Date | Document Type |
| WA DOT Signals Maintenance - No Further Action Letter | 8/27/2019 | NFA Letter – non-VCP |
| WA DOT Signals Maintenance - RCU Status Update | 3/4/2013 | Early Notice Letter |
Leaking Underground Storage Tank 1
| Document Title | Document Date | Document Type |
| WA DOT Signals Maintenance - UST Removal & Site Characterization Report | 8/7/2015 | LUST Site Characterization Report |
Public Information 1
| Document Title | Document Date | Document Type |
| WA DOT Signals Maintenance - Delisting Fact Sheet | 7/19/2019 | Fact Sheet\Public Notices |
Technical Reports 4
| Document Title | Document Date | Document Type |
| WA DOT Signals Maintenance - Draft Supplemental Site Investigation Report | 1/16/2019 | Remedial Investigation Report |
| WA DOT Signals Maintenance - Site Hazard Assessment | 8/21/2015 | Site Hazard Assessment Report |
| WA DOT Signals Maintenance - Rank Notification Letter | 7/1/2015 | Site Specific Administrative Document - other (Administrative correspondence) |
| WA DOT Signals Maintenance - SHA Notification Letter | 9/26/2014 | Site Specific Administrative Document - other (Administrative correspondence) |
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
-
Northwest Regional Office15700 Dayton Ave NShoreline, 98133Please schedule an appointment to view print documents at this location.
-
Seattle Public Library - Beacon Hill Branch2821 Beacon Ave SSeattle, 98144This location may only have print documents available during open comment periods.
Contaminants 4
| Contaminant Type | Soil |
Groundwater |
Surface Water |
Air |
Sediment |
Bedrock |
|---|---|---|---|---|---|---|
| Non-Halogenated Organics - Benzene | RB | B | ||||
| Non-Halogenated Organics - Petroleum-Diesel | RB | B | ||||
| Non-Halogenated Organics - Petroleum-Gasoline | RB | B | ||||
| Non-Halogenated Organics - Petroleum-Other | RB | B |
- 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.