CLARC guidance

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

Overview of cleanup standards, WAC 173-340-700 through 710

Mixing cleanup methods A, B, C

Guidance on the use of Method A, B, and C cleanup levels and mixing methods (CLARC guidance)

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

Formula values for potable groundwater, surface water, air, and soil (2001)

Groundwater cleanup standards

Method A table values (background for developing tables in WAC 173-340-900)

Potable groundwater (background for Table 720-1) (2001 & 2004)

Method B and C formula values

Formula values for potable groundwater, surface water, air, and soil (2001)

Concentrations established under ARARs

Applicable state & federal laws: potable groundwater

Surface water cleanup standards

Method B and C formula values

Formula values for potable groundwater, surface water, air, and soil (2001)

Concentrations established under ARARs

CLARC historical table summary of chemical-specific considerations (CLARC guidance)
Benzo(a)pyrene and carcinogenic PAHs (cPAHs): Deriving cleanup levels under MTCA (CLARC guidance)
Evaluating the human health toxicity of carcinogenic PAHs (cPAHs) using Toxicity Equivalency Factors (TEFs) (Toxics Cleanup Program Implementation Memo No. 10)
Evaluating the toxicity and assessing the carcinogenic risk of environmental mixtures using Toxicity Equivalency Factors (CLARC guidance)
Trichloroethylene (TCE): Deriving cleanup levels under MTCA (CLARC guidance)
Tetrachloroethylene (PCE): Deriving cleanup levels under MTCA (CLARC guidance)
Vinyl chloride: Deriving cleanup levels under MTCA (CLARC guidance)
Uranium soluble salts: Noncancer oral reference dose for uranium, soluble salts (CLARC guidance)

Contact information

Policy & Technical Support Unit
Toxics Cleanup Program
360-407-7324 (Andy Kallus, Toxicologist)
360-407-7170 (TCP main desk)

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CLARC guidance

Related links

Contact information