35 Ill. Adm. Code 808.411
Significant Trace Constituents
Section 808
Section 808.411 Significant
Trace Constituents
A significant trace constituent
is a constituent revealed by analysis:
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.