When establishing cleanup levels for your contaminated site, use these guidance documents in combination with the CLARC data tables. CLARC — Cleanup Levels and Risk Calculation — is a compendium of technical information to help you determine hazardous waste cleanup levels under Washington's Model Toxics Control Act (MTCA).
Model Toxics Control Act
Cleanup standards - General
Mixing cleanup methods A, B, C
Soil cleanup standards - general
Method A soil cleanup levels
Soil cleanup standards - Protection of environment
Terrestrial ecological screening values
Soil cleanup standards - Protection of groundwater
Method A table values (background for developing tables in WAC 173-340-900)
Method B and C formula values
Groundwater cleanup standards
Concentrations established under ARARs
Surface water cleanup standards
Air cleanup standards
CLARC data tables and other technical information CLARC's supplemental materials on EZView's website Ecology's Model Toxics Control Act (MTCA) page
Policy & Technical Support Unit Toxics Cleanup Program 360-407-7324 (Andy Kallus, Toxicologist) 360-407-7170 (TCP main desk)