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[Portal ID #1987]

Cleanup Levels and Risk Calculation (CLARC)

Summary of the project

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Welcome to the EZView library for the Cleanup Levels and Risk Calculation (CLARC). 

Page last updated 2/8/2021.  February 2021 updates are now online.       

What is CLARC?

Cleanup Levels and Risk Calculation (CLARC) is a compendium of technical information related to calculating cleanup levels under Washington's Cleanup Rule, Chapter 173-340 WAC. The Washington State Department of Ecology maintains CLARC on Ecology's website as a service to staff and the public.  

How does this EZView website support CLARC?

We store CLARC's technical documents in the EZView Library then link to them from CLARC's pages on Ecology's website. You can use these documents in combination with CLARC's data tables and guidance to help you establish cleanup levels for chemicals found at your hazardous waste site.

Why do cleanup levels matter?

Cleanup levels help determine what actions (if any) may be needed to protect the health of people, animals, and plants from chemical contamination at a hazardous waste site that's being cleaned up under our state's environmental law, the Model Toxics Control Act (MTCA), Chapter 70.105D RCWMTCA's regulations, known as the Cleanup Rule, set standards to make sure cleanups protect your health and environment.   

Learn more about Washington's contaminated sites: 


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DISCLAIMER:  CLARC is not mandated by law, but rather is provided as a service to staff and the public. While the information provided in CLARC is extensive, it is not exhaustive and the user may need to obtain information from additional sources for certain hazardous substances. Although CLARC has undergone review to ensure the quality of the information provided, there is no assurance that CLARC is free from errors. If necessary, calculation results and values obtained from applicable state and federal laws and literature sources should be verified independently and confirmed by consulting Ecology's site managers. CLARC cannot be relied on to create rights, substantive or procedural, enforceable by any party in litigation with the State of Washington. 

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