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The State of Washington's Model Toxics Control Act cleanup standards, argues the author, provide the best available strategy for setting and achieving cleanup goals. Besides Protecting human health and the natural environnment, Washington's guidelines, which took effect March 1, 1991, incorporate enough flexibility to handle site-specific, finaical, and tehnological considerations. This column outlines the law's three approaches for defining cleanup levels for groundwater, surface water, air, industrial soils, and nonindustrial soils, comparing these methods with related methods in California, New Jersey, and New York.