Facility Site ID: 1948927 Cleanup Site ID: 2074

  • Site Status

  • Cleanup Started

Status Update

·         In 2018 and 2019, baseline groundwater samples were taken before the injection of emulsified oil substrate.  Groundwater contamination was found in the most downgradient row of injection wells.

·         Hearthstone will install one additional shallow groundwater monitoring well and one deep groundwater monitoring well in June 2020.

·         Hearthstone will collect one round of groundwater samples from the existing well network in January 2020, and another round of groundwater samples in March 2020.

·         Ongoing compliance groundwater monitoring to monitor groundwater quality for constituents of potential concern at the standard point of compliance and performance monitoring to monitor natural attention and geochemical processes and PCE decay rates to assess the subsurface environment and redox conditions within the Shallow Zone and Deep Zone and assess effectiveness of the groundwater treatment program.

Cleanup Actions Completed Between 2016 And 2018

Thermal treatment
Thermal treatment

·         Demolition of the Dry Cleaner Building to slab on grade for preparation of in situ treatment of soil located in the source area.

·         Removal of the two closed-in-place underground storage tanks that reportedly stored Stoddard solvent located directly north of the Dry Cleaner Building Property in the right-of-way of Woodlawn Avenue North East.

·         Removal of the heating oil underground storage tanks located on the Dry Cleaner Building Property.

·         In situ treatment of soil to a depth of 16 feet below ground surface with concentrations of PCE, designated as dangerous waste when generated, located at the Dry Cleaner Building Property in combination with segregation, excavation, and disposal of contaminated and clean soil and fill materials to meet state cleanup regulations (Model Toxics Control Act).

·         Installation of remediation well network and the injection of emulsified oil substrate to treat contaminated soil and groundwater located in the Shallow Zone and Deep Zone.

·         Implementation of Institutional Controls at property parcels for areas with residual soil with concentrations of PCE located below the practicable limits of excavation at the Site.

Site Background

The Site is located in at 6860, 6869, and 6870 Woodlawn Avenue Northeast, Seattle, Washington in the Greenlake neighborhood, and consists of approximately 1.04 acres.  The existing building, Plastic Sales Inc. conducted its operation, was replaced with a four story retirement building, similar to the four story building at 6860 Woodlawn Ave Northeast which was built in 2010.

In 1947, Sunshine Cleaners acquired property within the Site and constructed a dry cleaning facility.  The building (known as the Dry Cleaner Building Property) utilized steam heat fueled by a heating oil underground storage tank (UST).  The dry cleaning facility operated from 1948 to 1977.  Sunshine Cleaners used Stoddard solvent, which was stored in two USTs with capacities of 1,500 and 2,000 gallons.  The USTs were reportedly abandoned in-place in 1958, when Sunshine Cleaners began using tetrachloroethene (PCE) for dry cleaning operations.  Sunshine Cleaners reportedly stored PCE in an aboveground storage tank (AST) with a capacity of 200 gallons.

Plastic Sales and Service (PSS) began operating at the Dry Cleaner Building Property in 1978, as a plastic fabrication facility.  PSS stored, finished and transformed plastic stock materials into final products from 1978 until 2014. 

Hearthstone purchased the Dry Cleaner Building Property in June 2014.

In September 2009, Agreed Order No. DE 7084 was entered into by Ecology, The Hearthstone, PSS, Karkrie LLC, and Ruben and Patricia Rael.  Under the terms of the Agreed Order, the PLPs agreed to complete a Remedial Investigation/Feasibility Study (RI/FS).

In June 2016, Consent Decree was entered into by Ecology and The Hearthstone.  Under the terms of the Consent Decree, the Hearthstone agreed to implement cleanup actions described in the Cleanup Action Plan.

Contaminants Of Concern

Release(s) and/or potential release(s) of hazardous substances occurred at the Site, including:

Tetrachloroethene (PCE)
Trichloroethene (TCE)
Cis-1,2-dichloroethene
Trans-1,2-dichloroethene
Vinyl chloride

​Hazardous substances have been and may continue to be released from the Site into the environment including soil, groundwater and air.

Legal 5
Document Title Document Date Document Type
Janke Property environmental covenant 6/4/2018 Environmental Covenant; Alternative Mechanism
Hearthstone Property Covenant 3/28/2018 Environmental Covenant; Alternative Mechanism
Consent Decree 6/2/2016 Consent Decree
Site diagram 3/16/2016 Consent Decree
Plastic Sales Agreed Order 9/14/2009 Agreed Order
Public Information 8
Document Title Document Date Document Type
ResponsesToComments 5/16/2016 Fact Sheet\Public Notices
Plastic Sales & Service - Consent Decree Documents Fact Sheet 3/21/2016 Fact Sheet\Public Notices
Plastic Sales & Service Site - Spanish Fact Sheet 3/21/2016 Fact Sheet\Public Notices
Plastic Sales and Service - Chinese Fact Sheet 3/21/2016 Fact Sheet\Public Notices
Plastic Sales & Service Site - Public Participation Plan 3/21/2016 Public Participation Plan
Plastic Sales Fact Sheet Interim Remedial Action Workplan and SEPA DNS 12/1/2010 Fact Sheet\Public Notices
Plastic Sales Fact Sheet Agreed Order and Public Participation Plan 6/25/2009 Fact Sheet\Public Notices
Plastic Sales Public Partcipation Plan 1/1/2009 Public Participation Plan
Technical Reports 34
Document Title Document Date Document Type
Progressmemo_Q22024 6/17/2024 Progress Report
2023AnnualGounewaterRpt 2/22/2024 Progress Report
2023- Groundwater Pilot Test Work Plan Addendum 1/30/2024 Remedial Investigation Work Plan
Dec 4 2023_Janke Indoor Air_Tbl 2 12/17/2023 Site Specific Technical Document - other
Dec 4 2023_Janke Soil Gas_Tbl 1 12/14/2023 Site Specific Technical Document - other
2023Q4_Plume Stability 11/29/2023 Groundwater Monitoring Report
2023Q4_GWCM-D-FIG-2 11/29/2023 Groundwater Monitoring Report
2023Q4_GWCM-S-FIG-1 11/29/2023 Groundwater Monitoring Report
2023Q4_Tbl2 11/29/2023 Groundwater Monitoring Report
Pilot Test Work Plan 9/11/2023 Remedial Investigation Work Plan
vapor intrusion assessment sampling and analysis plan 8/15/2023 Sampling and Analysis Plan
2023Q2_Plume Stability 7/10/2023 Progress Report
2023Q2_GWCM-D-FIG-2 7/10/2023 Progress Report
2023Q2_GWCM-S-FIG-1 7/10/2023 Progress Report
P2023Q2_CVOC_Results 7/10/2023 Progress Report
Groundwater Progress Report Q4 2022 12/28/2022 Groundwater Monitoring Report
Groundwater Progress Report Q2 2022 7/25/2022 Progress Report
PlasticSalesTech Memo_DowngradientWell 12/18/2020 Performance/Confirmational Monitoring Plan or Report
PlasticSales_2020Q4_GWCM-D-FIG-8 11/12/2020 Performance/Confirmational Monitoring Plan or Report
PlasticSales_2020Q4_GWCM-S-FIG-6 11/12/2020 Performance/Confirmational Monitoring Plan or Report
Groundwater Performance Monitoring Plan 3/4/2020 Performance/Confirmational Monitoring Plan or Report
Plastic Sales & Service - Contained-In Determination Letter 4/29/2019 Site Specific Administrative Document - other (Administrative correspondence)
IW33/IW34 2019 Email Memo 4/16/2019 Performance/Confirmational Monitoring Plan or Report
IW33/IW34 2019 data 4/16/2019 Performance/Confirmational Monitoring Plan or Report
Contained-In_Request 5/10/2018 Remedial Action/As-Built Report
Thermal Treatment Progress Report 2 1/11/2017 Progress Report
Thermal Treatment Progress Report 1 11/10/2016 Progress Report
Contained-In_Request_ 10/26/2016 Remedial Action/As-Built Report
Engineering Design Report 3/9/2016 Engineering Design Report
REMEDIAL INVESTIGATION/FEASIBILITY STUDY Addendum 3/9/2016 Remedial Investigation / Feasibility Study
INTERIM REMEDIAL ACTION COMPLETION REPORT 12/18/2014 Interim Action Documents
DRAFT FINAL Remedial Investigation and Feasibility Study Report 7/3/2013 Remedial Investigation / Feasibility Study
Plastic Sales & Service Contained Out Determination 11/14/2011 Site Specific Administrative Document - other (Administrative correspondence)
Plastic Sales & Service Site Hazard Assessment 2/1/2006 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.
  • Greenlake Public Library
    7364 E. Green Lake Dr. N
    Seattle, 98115
    This location may only have print documents available during open comment periods.

Contaminants 2

Contaminant Type
Soil
Groundwater
Surface Water
Air
Sediment
Bedrock
Halogenated Organics - Halogenated Organics C C S S
Non-Halogenated Organics - Petroleum Products-Unspecified C 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.