Ill. Admin. Code tit. 32, § 406.25
AGENCY NOTE: In this Part, the Department has specifically incorporated by reference the methods listed in the table in Section 141.25(a), "Analytical Methods for Radioactivity", 40 CFR 141, National Primary Drinking Water Regulations effective as of March 5, 1997. This table was originally published at 62 FR 10173 - 10174 (March 5, 1997). The Department further incorporates the latest publication of the "Determination of Radium-228 in Drinking Water", August 1990, in lieu of the reference publication date shown in footnote 10 on page 10174. Additionally, in footnote 12 on page 10174, the correct scientific number should read pCi/[Micro]g.