Landsburg Mine
Kent Kangley Rd & 268th Ave SE, Ravensdale, WA 98051

Landsburg Mine Trench
Please click on the photo for a larger view


Ecology is amending the legal agreement, called a Consent Decree, and the Cleanup Action Plan for the Landsburg Mine Site in Ravensdale. They’re being amended because trace amounts of a compound called 1,4-Dioxane were discovered in groundwater, in a limited area of the Site outside the former coal mine. Ecology wants to ensure that it gets addressed appropriately.

We’d like your input on:

·        Cleanup Action Plan Amendment: an update to Ecology’s plan that describes the cleanup work to address contamination at the Site.

•    Consent Decree Amendment: an update to the 2017 legal agreement that was signed by Ecology and the Landsburg Mine Potentially Liable Persons (PLP) Group.

Ecology will accept public comments on these documents from May 10 through July 8, 2021. You can comment by contacting Jerome Cruz or Brad Petrovich at the contacts to the right of this page, or with Ecology's e-comment system.

Ecology will host an online public meeting to present these amendments and information about the Landsburg Mine Site. (Please note that in consideration of public health and safety, we are hosting public meetings online instead of in-person meetings).


Wednesday, May 19, 2021

6-7pm – presentation

7pm – Q & A (as needed)

Register at:

Read more about these new amendments, 1,4 Dioxane, and some history of the Landsburg Mine and Site at Ecology's Blog.

Landsburg Mine Location
Please click on the photo for a larger view


The Landsburg Mine site is a former underground coal mine located approximately 1.5 miles northwest of Ravensdale in southeast King County. The site is located directly south of the S.E. Summit-Landsburg Road and north of S.E. Kent-Kangley Road. The Cedar River is approximately 500 feet north of the site. The former mine site occupies property currently owned by Palmer Coking Coal Company and formerly by the Plum Creek Timber Company, L.P.

During the late 1960s to late 1970s, industrial wastes were disposed in the trench that formed above the former mine. The 1996 remedial investigation and subsequent interim, ongoing groundwater monitoring have shown no impacts to groundwater at the site or surrounding areas.

Please click on the photo for a larger view


The Environmental Protection Agency (EPA) developed an Environmental Justice (EJ) tool for mapping and screening a community, called EJ Screen. Ecology uses this tool to learn about the demographics of communities around cleanup sites. By doing this we can better design a cleanup and communication strategy that works for the community. The EJ Screen tool is based on nationally consistent data and an approach that combines environmental and demographic indicators in maps and reports. See below for information about demographics in the area of the Landsburg Mine Site.

EJSCREEN Census Block Map - This shows the Census Blocks used to generate the reports below.

EJSCREEN ACS Summary Report Landsburg Mine Site – This shows the demographic information about the population of the area.

EJScreen Report Landsburg Mine Site – This report shows the values for environmental and demographic indicators and EJSCREEN indexes. These percentiles provide perspective on how the selected block group or buffer area compares to the entire state, EPA region, or nation.

What's in My Neighborhood?
In addition to EPA's EJ Screen tool, Ecology developed a tool you can use to see what other cleanups are happening in any neighborhood you're interested in. You can view it by going to What’s in My Neighborhood .



Map showing site location as King County, WA SITE INFORMATION


View Electronic Documents

Cleanup Site Details Report

Facility Site ID: # 2139

Cleanup Site ID: 60

Ravensdale, King County

Status: Cleanup Started   Get definitions of Status terminology

Jerome Cruz
Site Manager

Brad Petrovich
Project Planner and Public Involvement Coordinator
(425) 649-4486

Document Repositories:

Northwest Regional Office
3190 160th Ave SE
Bellevue, 98008-5452