Pit Stop Naches
Facility Site ID:
505
Cleanup Site ID:
4928
Cleanup Complete
In October 2023, Ecology issued a no further action letter for the site. Public comment to remove the site from the Hazardous Sites List was completed March 1, 2024.
Site Description
The site operates as a gas station and convenience stop. In 1991, during a site assessment four test pits were excavated. Soil sampling showed that gasoline, ethylbenzene, and xylenes were above Model Toxics Control Act (MTCA) cleanup levels for soil. Groundwater sampling of water that seeped into the test pits showed that gasoline, diesel, benzene, toluene, ethylbenzene, and xylenes were above MTCA cleanup levels for groundwater.
The Site is currently on Ecology’s Hazardous Sites List with a ranking of “3”. Sites on the Hazardous Sites List are a priority for Ecology, and have completed a Site Hazard Assessment (SHA). A SHA provides information about the environmental risk of the site. Risk is based on the amount of contaminants, how toxic they are, and how easily they can come in contact with people and the environment. Sites are ranked relative to each other on a scale of “1” to “5”; with a rank of “5” being the lowest.
The Site is currently on Ecology’s Hazardous Sites List with a ranking of “3”. Sites on the Hazardous Sites List are a priority for Ecology, and have completed a Site Hazard Assessment (SHA). A SHA provides information about the environmental risk of the site. Risk is based on the amount of contaminants, how toxic they are, and how easily they can come in contact with people and the environment. Sites are ranked relative to each other on a scale of “1” to “5”; with a rank of “5” being the lowest.
What's Been Done
Site investigations began in 1991 where petroleum contamination was identified in soil and groundwater. Interim action in 1998 excavated and removed “obviously stained or odiferous soil”. Additional site assessment in January 2016 detected soil and groundwater contamination above MTCA cleanup levels in monitoring well MW-2.
Five additional wells were drilled in May 2016, for a total of eight monitoring wells. Contamination was not detected in soil or water samples taken during the May subsurface investigation; this includes samples from MW-2. Subsurface investigation in March 2017 detected diesel in groundwater samples. Further investigation in September 2017 detected additional soil contamination above MTCA cleanup levels.
Additional wells were drilled in 2017, 2018, and 2020 yielding a total of 13 monitoring wells.
In 2020, another boring yielded a soil and groundwater samples above MTCA cleanup levels. Groundwater samples have not exceeded site cleanup levels since April 2020.
Five additional wells were drilled in May 2016, for a total of eight monitoring wells. Contamination was not detected in soil or water samples taken during the May subsurface investigation; this includes samples from MW-2. Subsurface investigation in March 2017 detected diesel in groundwater samples. Further investigation in September 2017 detected additional soil contamination above MTCA cleanup levels.
Additional wells were drilled in 2017, 2018, and 2020 yielding a total of 13 monitoring wells.
In 2020, another boring yielded a soil and groundwater samples above MTCA cleanup levels. Groundwater samples have not exceeded site cleanup levels since April 2020.
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.
Documents 28
Legal 1
| Document Title | Document Date | Document Type |
| Pit Stop Naches ENL | 12/16/1991 | Early Notice Letter |
Leaking Underground Storage Tank 1
| Document Title | Document Date | Document Type |
| Pit Stop Naches - UST Decommissioning Addendum | 10/17/2022 | LUST - Site Assessment Report |
Public Information 1
| Document Title | Document Date | Document Type |
| Pit Stop Naches - Delisting Fact Sheet | 2/1/2024 | Fact Sheet\Public Notices |
Technical Reports 17
| Document Title | Document Date | Document Type |
| Pit Stop Naches - July 2021 Groundwater Monitoring Report & NFA Request | 9/1/2021 | Groundwater Monitoring Report |
| Pit Stop Naches Well Installation & April 2021 Groundwater Monitoring | 5/20/2021 | Groundwater Monitoring Report |
| Pit Stop Naches - Data Gap Investigation April 2020 | 8/10/2020 | Site Specific Technical Document - other |
| Pit Stop Naches Remedial Investigation Report | 9/10/2018 | Remedial Investigation Report |
| Pit Stop Naches Subsurface Investigation Report | 5/3/2017 | Site Specific Technical Document - other |
| Naches Pit Stop Groundwater Sampling Results Report | 10/26/2016 | Groundwater Monitoring Report |
| Pit Stop Naches Subsurface Investigation Report | 7/8/2016 | Site Specific Technical Document - other |
| Pit Stop Naches Phase II Environmental Site Assessment | 3/4/2016 | Site Specific Technical Document - other |
| Pit Stop Naches 30-day Notice of Potential Liability-Bissell | 2/24/2016 | Site Specific Administrative Document - other (Administrative correspondence) |
| Pit Stop Naches 30-day notice of potential liability - Kang | 12/30/2015 | Site Specific Administrative Document - other (Administrative correspondence) |
| Pit Stop Naches 30-day notice of potential liability - Chang | 12/30/2015 | Site Specific Administrative Document - other (Administrative correspondence) |
| Pit Stop Naches SHA Results Notification - rank update | 7/16/2004 | Site Specific Administrative Document - other (Administrative correspondence) |
| Pit Stop Naches Limited Site Cleanup Rpt | 6/20/1998 | Remedial Action Report |
| Pit Stop Naches SHA Results Notification - rank update | 8/30/1993 | Site Specific Administrative Document - other (Administrative correspondence) |
| Pit Stop Naches SHA Results Notification | 2/12/1992 | Site Specific Administrative Document - other (Administrative correspondence) |
| Pit Stop Naches - Site Hazard Assessment | 2/1/1992 | Site Hazard Assessment Report |
| Pit Stop Naches Exploratory Investigation Rpt | 7/1/1991 | Site Specific Technical Document - other |
Voluntary Cleanup Program 8
| Document Title | Document Date | Document Type |
| Pit Stop Naches - No Further Action - Model Remedy 5 - VCP CE0547 | 10/9/2023 | VCP Opinion on Site Cleanup – NFA |
| Pit Stop Naches - VCP CE0547 acceptance letter and agreement | 9/12/2023 | VCP Administrative Document |
| Pit Stop Naches - VCP Further Action | 9/21/2020 | Voluntary Cleanup Program Opinion – Other |
| Pit Stop Naches - Request for Information on Status of VCP | 3/11/2020 | VCP Administrative Document |
| Pit Stop Naches VCP Further Action | 9/14/2018 | Voluntary Cleanup Program Opinion – Other |
| Pit Stop Naches VCP Cleanup Status letter | 6/28/2018 | Voluntary Cleanup Program Opinion – Other |
| Pit Stop Naches VCP Further Action Letter | 1/27/2017 | Voluntary Cleanup Program Opinion – Other |
| Pit Stop Naches VCP Further Action letter | 6/22/2005 | Voluntary Cleanup Program Opinion – Other |
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 4
| Contaminant Type | Soil |
Groundwater |
Surface Water |
Air |
Sediment |
Bedrock |
|---|---|---|---|---|---|---|
| Non-Halogenated Organics - Non-Halogenated Solvents | RB | RB | ||||
| Non-Halogenated Organics - Benzene | RB | RB | ||||
| Non-Halogenated Organics - Petroleum-Diesel | RB | RB | ||||
| Non-Halogenated Organics - Petroleum-Gasoline | RB | 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.