HEGLAR KRONQUIST
Hegler Rd & Kronquist Rd, Mead, WA 99021

PUBLIC COMMENT PERIOD NOVEMBER 02, 2020-DECEMBER 01, 2020

Draft 5-Year Periodic Review Report

Ecology invites you to review and comment on the first periodic review for the Heglar Kronquist site. We complete a periodic review at least every 5 years after beginning cleanup at a site, as required by the Model Toxics Control Act. The purpose of the review is to evaluate site conditions after initial cleanup is complete to ensure people and the environment are protected.

In August 2020, we completed the first periodic review and required no new cleanup actions. However, chloride and nitrate concentrations higher than state standards are still found in some groundwater monitoring wells. Monitoring will continue, and we will assess the cleanup progress in another 5 years. The deed restrictions prevent site uses inconsistent with the presence of contamination.

Due to the potential health risks presented by the coronavirus, in-person document reviews are not currently available. If you need print documents for review, please contact Erika Beresovoy at erika.beresovoy@ecy.wa.gov or 509-385-2290.

Submit comments online, via mail or email by December 1

Justin Rice, justin.rice@ecy.wa.gov
N. 4601 Monroe St., Spokane, WA 99205-1265
Online comment form

Next steps

Ecology will review all comments received during the comment period and make recommendations for suggested changes. If no significant changes are made, the periodic review will become final. If significant changes are made, an additional public comment period will be held. We will hold an online public meeting if 10 people request it.


Please click on the photo for a larger view

SITE BACKGROUND

The nearly four-acre site is located 10 miles northeast of downtown Spokane in a rural area. 

The site was a county gravel pit from 1963 to 1969. From 1969 to 1974, Kaiser Aluminum & Chemical Corporation (Kaiser) disposed of aluminum black dross (dross) from its Trentwood facility at the site. Dross is a by-product from processing aluminum. 

Dross disposal activities stopped after elevated levels of chloride and sodium (constituents of dross) were detected in water samples collected from a shallow groundwater well and spring near the site.


CONTAMINATION

Past site data showed chemicals of concern related to the aluminum dross include:

Chloride and nitrates were selected as indicators of landfill impacts to groundwater and surface water. Chloride is considered a good tracer because of its correlation with other dross constituents and because it does not readily adsorb in groundwater. Nitrate was also selected as an indicator; however, nitrate concentrations can be highly variable at the site, and area-wide sources such as cattle activity and fertilizers may contribute to elevated nitrate concentrations.

Drinking water is not impacted by site-related contaminants.


CLEANUP

Kaiser is responsible for cleanup costs.

In 1979, the U.S. Environmental Protection Agency (EPA) conducted water and air sampling to document impacts to groundwater, surface water (springs), and air from the dross. Impacts to groundwater included elevated chloride and sodium concentrations. Elevated ammonia concentrations were measured in air (ammonia is a result of a reaction between dross and water).

In 1979, Kaiser hired a consultant to assess the site, and as a result, conducted the following actions in 1983 and 1984:

  • Constructed a 2-foot thick clay cover with a vegetated topsoil surface
  • Constructed drainage ditches
  • Constructed a fence to restrict access
  • Conducted groundwater and surface water monitoring

Based on surface water (springs) collected down gradient from the Site, a 50 percent reduction of chloride concentrations was observed following cover construction; however, chloride concentrations still exceeded water standards.

In 2006, Ecology conducted a Site Hazard Assessment to determine its ranking relative to other contaminated sites in Washington. The Site ranked a 2 on a scale of 1 to 5; 1 represents the highest risk.

Kaiser completed the Remedial Investigation (RI) in 2011, and the Feasibility Study (FS) in 2012. The RI determined the extent of contamination and the FS evaluated cleanup options.

In 2012, Ecology issued the Cleanup Action Plan, identifying the following actions:
  • Enhancing the cover to prevent water from infiltrating and spreading the dross contaminants
  • Monitoring groundwater 
  • Fencing around the landfill property, applying restrictions to limit the use of the property via an environmental covenant recorded as part of the property deed, inspecting and maintaining the cover, signs to warn people about contamination, and financial assurance that the cleanup costs will be covered.

Periodic reviews

We complete a periodic review at least every 5 years after beginning cleanup at a site, as required by the Model Toxics Control Act. The purpose of the review is to evaluate site conditions after initial cleanup is complete to ensure people and the environment are protected.

In 2020, we completed the first periodic review and required no new cleanup actions. However, chloride and nitrate concentrations higher than state standards are still found in some groundwater monitoring wells. Monitoring will continue, and we will assess the cleanup progress in another 5 years.


 

Map showing site location as Spokane County, WA SITE INFORMATION

Map

View Electronic Documents

Cleanup Site Details Report

Facility Site ID: # 645

Cleanup Site ID: 1135

Location:
Mead, Spokane County

Status: Construction Complete-Performance Monitoring   Get definitions of Status terminology

Comment Period:
NOVEMBER 02, 2020 - DECEMBER 01, 2020

Contacts:
Justin Rice
Site Manager
(509) 329-3516

Erika Beresovoy
Public Involvement Coordinator
509-329-3546


Document Repositories:

Eastern Regional Office
N 4601 Monroe St
Spokane, 99205-1265
(509)329-3415

North Spokane Public Library
44 E Hawthorne Rd.
Spokane, 99218
(509)893-8350