If the Agency requires soil sampling and analysis pursuant to Section 391.430, the method of analysis shall be performed in accordance with the following references unless equivalent results can be obtained by other methods. The permittee or applicant shall demonstrate that equivalent results are obtainable based on the nature of the test methodology, the nature of the parameter and the level of statistical accuracy.
Methods of Soil Analysis - Part 2 (1982) 2nd edition, Chemical and Microbiological Properties, Agronomy Series No. 9, A. L. Page (editor), American Society of Agronomy, Inc. (Publisher).
Ill. Admin. Code tit. 35, § 391.511