LAB §6383: (a) For the purposes of this chapter, a hazardous substance is present in any mixture or product if it is present in any of the following concentrations: (1) One percent or more of the mixture or prod

(a) For the purposes of this chapter, a hazardous substance is present in any mixture or product if it is present in any of the following concentrations: (1) One percent or more of the mixture or product. (2) Two percent of the mixture or product if the hazardous substance exists as an impurity in the mixture. (3) One-tenth of 1 percent of the mixture or product if the hazardous substance in the mixture or product is designated as a carcinogen pursuant to the Occupational Carcinogens Control Act of 1976 (Ch. 2 (commencing with Section 24200), Div. 20, H.& S.C.) or the federal Hazard Communication Standard (29 C.F.R. Sec. 1910.1200). The director may, by regulation, raise the concentration requirement for a hazardous substance which the director finds is not hazardous at the threshold levels; and, lower the concentration requirement for a hazardous substance for which there is valid and substantial evidence that the substance is extraordinarily hazardous. (b) The manufacturer of a hazardous substance shall notify the director of any valid evidence which indicates that the concentration requirement for a hazardous substance established pursuant to subdivision (a) is higher than what is necessary to protect employees who work with, or may be exposed to, the substance.