Facility Site ID: 2708 Cleanup Site ID: 4294

  • Site Status

  • Cleanup Started

The site is near 4330 108th Street SE, in unincorporated Snohomish County in the Silver Lake neighborhood south of Everett. See pictures of landfill construction on our flickr account.

Status Of Cleanup Actions Under The Model Toxics Control Act

The Agreed Order requires P&GE to perform investigation activities under the state cleanup law, the Model Toxics Control Act. 

  • The Interim Action Completion Report is available. This report documents confirmation soil sampling performed during the excavation of the wedge area along the periphery of the original landfill. The report also describes confirmation soil sampling of imported fill material, the pre-construction sampling results (Appendix A), soil disposal documentation (Appendix C), asbestos-containing material documentation (Appendix D), an asbestos inspection summary for the excavated landfill material (Appendix E), and the lot exploration plan execution memorandum (Appendix F). The reconnaissance of the northeast slope is reported separately.
  • The Remediation Investigation Work Plan is available. Remedial investigation sampling activities commenced in July 2021.
  • Initial groundwater and surface water monitoring results have been reported.

Mudslide Incident

Mudslide Map
Mudslide Map

A mudslide occurred on northeastern portion of the Go East Corp. Landfill property on Sept. 17 and 18, 2021. The mudslide swept an estimated 500 to 700 cubic yards of imported clean soil downslope beyond the toe of the landfill. The incident occurred while crews constructed a planned access path to the toe of the landfill slope.

The mudslide occurred after clean fill material placed on the steep slope mobilized due to groundwater seepage and stormwater intrusion. The mudslide originated beyond the landfill boundary and deposited fill material beneath and beyond the toe of the landfill. Landfill material has not been observed in the mudslide. The mudflow extends across a wetland and to a stream on properties north and east of the property. The mudslide flowed across land owned by the 108th Street Point Homeowners Association, the Pinehurst at Waldenwood Homeowners Association, and the easement corridor for the Olympic Pipe Line Co.

A stable access path has now been constructed to the toe of the landfill to allow completion of the landfill closure activities.

P&GE (property owner) is working with Snohomish County Planning and Development Services to ensure the slope stability and permit modified development plans for stormwater drainage. P&GE is also working with Ecology’s Shorelands and Environmental Assistance Program to assess and mitigate damages to wetland resources. P&GE is responsible to communicating and coordinating activities with adjoining property owners.

Site History

The 40.9-acre Property sits atop the Vashon advance outwash sand formation, which outcrops where steep slopes are present on the east side of the Property. The Vashon advance outwash sand formation is underlain by low-permeability silt deposits referred to as the pre-Vashon lacustrine silt unit. The pre-Vashon lacustrine silt unit is estimated to be at least 110 feet thick beneath the Property.

In 1969, a conditional use permit was issued for sand excavation. Sand was excavated from a ravine on the northern part of the Property and used as construction fill for nearby construction projects. 

Rekoway, Inc. purchased the Property on February 1, 1972 and operated the landfill until 1980. Rekoway obtained a 10-year conditional-use permit from Snohomish County on March 8, 1972 to excavate sand and gravel and to operate a landfill by reclaiming the excavation area with solid waste. The permit authorized the disposal of “wood, mineral, and concrete solid materials, but not garbage or putrescibles.” In 1974-75, Rekoway was approved to accept “tires and bulk packaging material such as cardboard, pallets, large parcel wrappings, shredded paper, and warehousing waste material.” 

In 1974, Rekoway accepted approximately 200 cubic yards of baghouse dust containing magnesium, phosphate, and aluminum dust into the landfill. A fire resulted from the oxidation of the buried metal dusts. The material was excavated, spread on the ground, and extinguished, and thereafter covered with soil. Partially burned trees and stumps caused a landfill fire in November 1976 that persisted through 1979. Snohomish Health District suspended the landfill permit in November 1977.

Go East Corporation conditionally purchased the Property in 1979 and requested reinstatement of the landfill permit to allow additional filling to level the landfill area for future development. Snohomish Health District issued a permit to operate a wood waste landfill on November 2, 1979. The permit expired on September 18, 1982. Go East Corporation stopped accepting waste in the summer of 1983 when Snohomish County issued a stop work order. Another landfill fire began in October 1983 and burned out by January 1986.

Snohomish Health District prepared a Site Hazard Assessment under the Model Toxics Control Act (MTCA) on May 14, 2004. The assessment recommended that the future residential development of the Property include and implement a landfill closure plan as proposed in 1999. Subsequently, Snohomish Health District issued a No Further Action letter on June 1, 2004 with confirmation from Ecology.

P&GE acquired the Property from Go East Corporation in May 2009.

Ecology prepared an initial investigation field report on June 13, 2019 based on available information. The report indicates that metals (commonly associated with anaerobic reducing conditions) were detected at concentrations exceeding MTCA cleanup levels in three groundwater samples collected from monitoring wells in 2009. The report also indicates that elevated concentrations of metals were detected in surface water samples collected from a stream that originates at the base of the landfill’s northeastern slope. Additionally, the report refers to the alleged observation of partially buried drums by a third party, although this finding has not been confirmed by follow-up investigations. Based on information presented in the initial investigation field report, Ecology rescinded the 2004 No Further Action letter on June 18, 2019 and issued an Early Notice Letter on September 9, 2019. The Site is listed on Ecology’s Confirmed and Suspected Contaminated Sites List.

Landfill Closure And Development Plans

P&GE plans to redevelop the Property by consolidating and closing the landfill under current regulatory standards, and then developing the Bakerview Plat Subdivision on portions of the property that are beyond the final landfill boundary.

Agencies Working Together

Snohomish Health District 

Snohomish Health District issued a landfill permit for the closure of the Go East Corp Landfill in accordance with Chapter 173-350-400 of the Washington Administrative Code. The Health District’s approval of the Go East Landfill Closure Plan was affirmed by the state Pollution Control Hearings Board. Ecology’s Solid Waste Management Program supports the Health District but is not the regulatory agency for the landfill permit. 

Snohomish County Planning and Development Services 

Snohomish County Planning and Development Services issued a land disturbing activity permit for the initial rough grading (including landfill closure activities), and will issue a second land disturbing activity permit for plat development.  Jared Anderson (425-231-8111) is the site inspector for the County.

Washington State Department of Ecology

Ecology’s Water Quality Program grants a Construction Stormwater General Permit from our Water Quality Program. Ecology maintains Bakerview Everett stormwater permit documents on separate website.   

Ecology’s Solid Waste Management Program oversees cleanup of the site under the Model Toxics Control Act.

Ecology’s Shorelands and Environmental Assistance Program works to ensure the protection of wetland resources.

Requesting Accommodation

Ecology is committed to providing people with disabilities access to information and services. To request an ADA accommodation, contact Ecology by phone at 360-407-6831 or email at ecyadacoordinator@ecy.wa.gov. For Washington Relay Service or TTY call 711 or 877-833-6341.  Visit Ecology’s website for more information.

​If you speak a non-English language, free language services are available.

Report An Environmental Issue

To report an environmental problem or concern, any time, day or night.
Legal 10
Map 1
Document Title Document Date Document Type
Go East Corp. Landfill - Mudslide Map 10/12/2021 Map
Public Information 6
Technical Reports 21
Document Title Document Date Document Type
Go East Corp Landfill - Groundwater and Surface Water Monitoring Results, March 2022 5/25/2022 Groundwater Monitoring Report
Go East Corp Landfill - Landfill Closure Construction Summary Report (abbreviated version) 4/7/2022 Site Specific Technical Document - other
Go East Corp Landfill - Northeast Slope Reconnaissance and Observations Memorandum 4/7/2022 Interim Action Documents
Go East Corp Landfill - Landfill Gas Monitoring and Contingency Plan 3/18/2022 Site Specific Technical Document - other
Go East Corp Landfill - Groundwater and Surface Water Monitoring Results, December 2021 3/11/2022 Groundwater Monitoring Report
Go East Corp Landfill - Progress Report, 2021, Fourth Quarter 1/10/2022 Progress Report
Go East Corp Landfill - Final Interim Action Completion Report 11/23/2021 Interim Action Documents
Go East Corp Landfill - Progress Report, 2021, Third Quarter 10/13/2021 Progress Report
Go East Corp Landfill - Progress Report, 2021, Second Quarter 7/15/2021 Progress Report
Go East Corp Landfill - Remedial Investigation Work Plan 6/30/2021 Remedial Investigation Work Plan
Go East Corp Landfill - Progress Report, 2021, First Quarter 4/9/2021 Progress Report
Go East Corp Landfill - Interim Action Work Plan, Agreed Order No. DE 18121 Exhibit D 8/10/2020 Interim Action Documents
Go East Corp Landfill - Results of Pre-Construction Soil Sampling 7/30/2020 Site Specific Technical Document - other
Go East Corp Landfill - Closure Plans & Specifications - Land Disturbance Activity #1 7/20/2020 Construction Plans and Specifications
Go East Corp Landfill - Construction Quality Assurance Plan 4/7/2020 Construction Plans and Specifications
Go East Corp Landfill - Landau Associates Letter 9/18/2019 Site Specific Technical Document - other
Go East Corp Landfill - Initial Investigation Field Report 6/13/2019 Initial Investigation Report
Go East Corp Landfill - Information for MTCA Assessment 3/31/2019 Site Specific Technical Document - other
Go East Corp Landfill - Methane Gas Generation and Risk Mitigation Assessment Report 3/30/2019 Site Specific Technical Document - other
Go East Corp Landfill - Landfill Closure Plan 6/1/2018 Site Specific Technical Document - other
Go East Corp Landfill - Site Hazard Assessment 6/1/2004 Site Hazard Assessment Report
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 Office
    15700 Dayton Ave N
    Shoreline, 98133
    Please schedule an appointment to view print documents at this location.
  • Mill Creek Public Library
    15429 Bothell Everett Hwy
    Mill Creek, 98012
    This location may only have print documents available during open comment periods.

Contaminants 9

Contaminant Type
Soil
Groundwater
Surface Water
Air
Sediment
Bedrock
Metals - Metals Priority Pollutants C C C S
Metals - Metals - Other C
Non-Halogenated Organics - Polycyclic Aromatic Hydrocarbons C B B
Other Contaminant - Conventional Contaminants, Organic S C C S
Other Contaminant - Conventional Contaminants, Inorganic S C C S
Metals - Arsenic C C
Metals - Mercury B B
Reactive Wastes - Other Reactive Wastes S S S S
Non-Halogenated Organics - Petroleum-Other C
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.