AUTHORITY: Implementing Sections 21, 22, 22.01 and 22.9, and authorized by Section 27 of the Environmental Protection Act [415 ILCS 5/21, 22, 22.01, 22.9, 27].POLLUTION CONTROL BOARD
a) Which is present at a mass concentration of less than 1 percent; and
b) Which has a toxicity, BiTi, as determined in Appendix B, of less than 500 mg/1.
A significant trace constituent is a constituent revealed by analysis: