1. a) American National Standards Institute, 25 West 43^rd Street, 4^th Fl., New York, NY 10036. (212)642-4900.

   1. 1) ANSI/ASA S1.1-2013 "Acoustical Terminology".
   2. 2) ANSI/ASA S1.4-2014/Part 1/IEC 61672:1-2013 "American National Standard Electroacoustics – Sound Level Meters – Part 1: Specifications (a nationally adopted international standard)".
   3. 3) ANSI/ASA S1.6-2016 "Preferred Frequencies and Filter Bank Center Frequencies for Acoustical Measurements".
   4. 4) ANSI/ASA S1.8-2016 "Reference Values for Levels Used in Acoustics and Vibrations".
   5. 5) ANSI/ASA S1.11-2014/Part 1/IEC 61260:1-2014 "Electroacoustics − Octave-Band and Fractional-Octave-Band Filters – Part 1: Specifications (a nationally adopted international standard)".
   6. 6) ANSI/ASA S1.13-2005 (R2010) " Measurement of Sound Pressure Level in Air".
   7. 7) ANSI/ASA S12.9-2013/Part 1 "Quantities and Procedures for Description and Measurement of Environmental Sound – Part 1: Basic Quantities and Definitions".
   8. 8) ANSI/ASA S12.9-2013/Part 3 " Quantities and Procedures for Description and Measurement of Environmental Sound – Part 3: Short-Term Measurements with an Observer Present".
   9. 9) ANSI/ASA S12.51-2012/ISO 3741:2010 "Acoustics − Determination of Sound Power Levels and Sound Energy Levels of Noise Sources using Sound Pressure – Precision Methods for Reverberation Test Rooms (a nationally adopted international standard)".
   10. 10) IEC 61672-1:2013 "Electroacoustics Sound Level Meters – Part 1: Specifications".
2. b) Society of Automotive Engineers, 400 Commonwealth Drive, Warrendale, PA 15096. (877)606-7323.
3. 1) SAE Recommended Practice J184 "Qualifying a Sound Data Acquisition System", November 1998.
4. 2) SAE Recommended Practice J192 "Exterior Sound Level for Snowmobiles", January 2015.

5. 3) SAE/ANSI Recommended Practice J1161 "Operational Sound Level Measurement Procedure for Snowmobiles", April 2004.

   1. c) California Highway Patrol Sound Measurement Procedures HPH 83.1 (October 1, 1973, as amended November 9, 1975. Available at Illinois Pollution Control Board Clerk's Office, 100 W. Randolph Street, Suite 11-500, Chicago, IL 60601. (312)814-3620.

6. d) Code of Federal Regulations

   1. 1) 40 CFR 202.12(e) (2017).
   2. 2) 40 CFR 202.20(a) (2017).
   3. 3) 40 CFR 202.21(a) (2017).
   4. 4) 40 CFR 202.22 (2017).
   5. 5) 40 CFR 202.23 (2017).
   6. 6) 40 CFR 205.152(a) (2017).
   7. 7) 40 CFR 205.166 (2017).

The Board incorporates the following material by reference. These incorporations include no later amendments or editions.

(Source: Amended at 42 Ill. Reg. 20432, effective November 1, 2018)