Roslyn 4 Mine Site

Roslyn, Kittitas County
Facility Site ID: 66921
Cleanup Site ID: 15545

  • Site Status

  • Awaiting Cleanup

  • Process Type

  • Independent

  • Brownfield

  • This site has received funding as part of our Brownfields Program.
    Brownfields Public Funding: $1,986,350.00

More about cleanup

This site has confirmed or suspected contamination that could potentially harm people and the environment. It is in the state cleanup process under the Model Toxics Control Act.

See the Site Details report at left or the documents below to learn more about this site.

Ecology works to clean up contaminated properties throughout the state. Cleanups are construction projects that remove, treat, or contain potentially harmful substances.

Voluntary Cleanup Program

This site is in 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 sites Ecology manages under legal orders.

Places to see print documents
Legal 1
Document Title Document Date Document Type
Roslyn 4 Mine - Combined ENL 4/1/2022 Early Notice Letter
Technical Reports 9
Document Title Document Date Document Type
Cleanup Action Plan Roslyn No. 4 Mine 8/11/2025 Cleanup Action Plan
Roslyn 4 Mine - Draft Cleanup Action Plan 5/5/2025 Cleanup Action Plan
Roslyn 4 Mine - Supplemental Investigation Report 4/28/2025 Remedial Investigation Report
Roslyn 4 Mine - Data Gap Investigation Report 6/14/2023 Site Specific Technical Document - Other
Roslyn 4 Mine - PLP waiver 5/18/2022 Site Specific Administrative Document - Other (Administrative Correspondence)
Roslyn 4 Mine - Initial Investigation Field Report 3/18/2022 State Initial Investigation Report
Roslyn 4 Mine - Phase 1 Environmental Site Assessment (without Appendices E or G) 10/7/2020 Site Specific Technical Document - Other
Roslyn 4 Mine - Phase 1 Environmental Site Assessment Appendix E 10/7/2020 Site Specific Technical Document - Other
Roslyn 4 Mine - Phase 1 Environmental Site Assessment Appendix G 10/7/2020 Site Specific Technical Document - Other
Voluntary Cleanup Program 2
Document Title Document Date Document Type
Roslyn 4 Mine Site - VCP CE0558 - NFA Likely 7/31/2025 VCP Opinion on Site Cleanup – NFA
Roslyn 4 Mine - VCP acceptance letter and application forms 4/24/2024 VCP Administrative Document
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 Office
    1250 W Alder St
    Union Gap, 98903-0009
    Please schedule an appointment to view print documents at this location.

Contaminants 8

Contaminant Type
Soil
Groundwater
Surface Water
Air
Sediment
Bedrock
Metals - Metals - Other C C
Halogenated Organics - Polychlorinated biPhenyls (PCB) S S
Non-Halogenated Organics - Polycyclic Aromatic Hydrocarbons C S
Other Contaminant - Asbestos S
Metals - Arsenic C S
Metals - Lead C C
Metals - Mercury C S
Non-Halogenated Organics - Petroleum-Other C S
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.