Ill. Admin. Code tit. 35 § 104.515
"Act" means the Environmental Protection Act [ 415 ILCS 5 ].
"Best Management Practices" or "BMPs" means methods, measures or practices selected to meet nonpoint source control needs. BMPs include structural and nonstructural controls and operation and maintenance procedures. BMPs can be applied before, during and after pollution-producing activities to reduce or eliminate the introduction of pollutants into receiving waters.
"Highest Attainable Use" is the modified aquatic life, wildlife, or recreational use that is both closest to the uses specified in section 101(a)(2) of the Clean Water Act and attainable based on the evaluation of the factors in 40 CFR 131.10(g) that precludes attainment of the use and any other information or analyses that were used to evaluate attainability. There is no required highest attainable use when the State demonstrates the relevant use specified in section 101(a)(2) of the Clean Water Act and all the subcategories of such a use are not attainable.
"Non-101(a)(2) Use" is any use unrelated to the protection and propagation of fish, shellfish, wildlife, or recreation in or on the water.
"Pollutant Minimization Program", in the context of this Part, means a structured set of activities to improve processes and pollutant controls that will prevent and reduce pollutant loading.
"Substantial Compliance" means compliance with substantial or essential content requirements of 40 CFR 131.14, Section 38.5 of the Act, and Section 104.530 of this Part.
"Time-Limited Water Quality Standard" or "TLWQS" means a time-limited designated use and criterion for a specific pollutant or water quality parameter that reflects the highest attainable condition during the term of that relief.
Ill. Admin. Code tit. 35, § 104.515