[Code of Federal Regulations] [Title 40, Volume 24] [Revised as of July 1, 2006] From the U.S. Government Printing Office via GPO Access [CITE: 40CFR204.57-4] [Page 98] TITLE 40--PROTECTION OF ENVIRONMENT CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) PART 204_NOISE EMISSION STANDARDS FOR CONSTRUCTION EQUIPMENT--Table of Contents Subpart B_Portable Air Compressors Sec. 204.57-4 Testing. (a) The manufacturer shall conduct one valid test in accordance with the test procedures specified in Sec. 204.54 for each compressor selected for testing pursuant to this subpart. (b) No maintenance will be performed on test compressors, except as provided for by Sec. 204.57-3. In the event a compressor is unable to complete the emission test, the manufacturer may replace the compressor. Any replacement compressor will be a production compressor of the same configuration, and the replacement compressor will be randomly selected from the batch sample and will be subject to all the provisions of these regulations.