Lithia Dodge of Tri Cities
Facility Site ID:
22325
Cleanup Site ID:
5224
Cleanup Complete
In 2002, Ecology issued a no further action determination for the site.
In 2010, Ecology visited the site for a periodic review due to the possibility of residual contamination at the site. The periodic review concluded that a no further action determination remains appropriate for the site and that no additional periodic reviews are required. The remedy is protective of human health and the environment without the use of institutional controls, which drive the requirement for periodic reviews at cleanup sites.
In 2010, Ecology visited the site for a periodic review due to the possibility of residual contamination at the site. The periodic review concluded that a no further action determination remains appropriate for the site and that no additional periodic reviews are required. The remedy is protective of human health and the environment without the use of institutional controls, which drive the requirement for periodic reviews at cleanup sites.
Site Description
The site currently operates as a car dealership. Soil samples collected during a Phase II Environmental Site Assessment confirmed the presence of petroleum hydrocarbon (TPH) contamination at concentrations exceeding Model Toxics Control Act (MTCA) Method A cleanup levels.
Cleanup Activities
The property owner decided to remediate all contaminated soil by removing it and treating it using passive remediation at a separate treatment site. All clean overburden soil (about 4,000 cubic yards) was stockpiled on site for later backfilling of the pit, and all contaminated soil (about 2,000 cubic yards) was hauled to the treatment site.
It was determined that petroleum contamination has migrated under the existing service shop and extended beyond the north wall of the service shop. This conclusion was based upon the detection of petroleum above cleanup levels in the soil sample from location B25 on the opposite side of the service shop. Prior to initiating in-situ remediation efforts, it was estimated that 9,600 cubic yards of contaminated soil remained at the site.
To remediate the remaining contaminated soils, bioventing was proposed to promote natural attenuation. In 1998, a bioventing system pilot test was completed and the bioventing cleanup process was formally started. The bioventing system operated until 2000. At that point, it was determined that soil contamination had likely been remediated.
Three ground water monitoring wells were installed at the site in 1997. Samples were collected from each well for four consecutive quarters and analyzed for TPH and volatile organic compounds (VOCs). Concentrations of TPH or VOCs were not detected during any of the sampling events above MTCA Method A cleanup levels.
It was determined that petroleum contamination has migrated under the existing service shop and extended beyond the north wall of the service shop. This conclusion was based upon the detection of petroleum above cleanup levels in the soil sample from location B25 on the opposite side of the service shop. Prior to initiating in-situ remediation efforts, it was estimated that 9,600 cubic yards of contaminated soil remained at the site.
To remediate the remaining contaminated soils, bioventing was proposed to promote natural attenuation. In 1998, a bioventing system pilot test was completed and the bioventing cleanup process was formally started. The bioventing system operated until 2000. At that point, it was determined that soil contamination had likely been remediated.
Three ground water monitoring wells were installed at the site in 1997. Samples were collected from each well for four consecutive quarters and analyzed for TPH and volatile organic compounds (VOCs). Concentrations of TPH or VOCs were not detected during any of the sampling events above MTCA Method A cleanup levels.
Documents 2
Technical Reports 1
| Document Title | Document Date | Document Type |
| Lithia Dodge April 2011 Periodic Review | 4/1/2011 | Periodic Review (5 Year) |
Voluntary Cleanup Program 1
| Document Title | Document Date | Document Type |
| Lithia Dodge NFA ltr | 12/3/2002 | 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
-
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 |
|---|---|---|---|---|---|---|
| Non-Halogenated Organics - Petroleum-Other | RB |
- 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.