Cleanup Levels and Risk Calculation (CLARC)
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CLARC Overview

Cleanup Levels and Risk Calculations (CLARC) is a web-based compendium of technical information related to the calculation of cleanup levels under the Model Toxics Control Act (MTCA) Cleanup Regulation, Chapter 173-340 WAC. The Washington State Department of Ecology (Ecology) has compiled and calculated this technical information to assist the user in the development of cleanup levels at a site. User access to technical informaton in the CLARC Information System is initiated by a chemical specfic search engine using either the chemical name or Chemical Abstract Service Registry number (CAS#). The formula values pre-calculated under standard Method B and standard Method C and provided in CLARC are NOT cleanup levels.

The following discussion provides an overview of what information is accessible through CLARC and how that information can be accessed.

The CLARC Drop-down Menu Bar

At the top left of each page is a drop-down menu with a number of options.

                                On the right are links back to pages you have visited.

CLARC Database Menu

Move your mouse over the "CLARC Database" link and a menu will appear.

  • CLARC Database Search This takes you to the database search page. Use the "Choose Chemicals," "Choose Parameters," and "Choose Formats" tabs to create a report.
  • CLARC Help Use