[Code of Federal Regulations] [Title 40, Volume 21] [Revised as of July 1, 2007] From the U.S. Government Printing Office via GPO Access [CITE: 40CFR117.2] [Page 120] TITLE 40--PROTECTION OF ENVIRONMENT CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) PART 117_DETERMINATION OF REPORTABLE QUANTITIES FOR HAZARDOUS SUBSTANCES--Table of Contents Subpart A_General Provisions Sec. 117.2 Abbreviations. NPDES equals National Pollutant Discharge Elimination System. RQ equals reportable quantity.