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CONEG model legislation sets forth concentration levels for lead, cadmium, mercury and hexavalent chromium.coneg Specifically, the sum of the concentration levels must not exceed 600 parts per million (“ppm”) by weight (0.06%) effective 2 years after the state adopts the legislation, 250 ppm by weight (0.025%) effective 3 years after the state adopts the legislation, and 100 ppm by weight (0.01%) effective 4 years after the state adopts the legislation.However
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