[Code of Federal Regulations] [Title 40, Volume 19] [Revised as of July 1, 2003] From the U.S. Government Printing Office via GPO Access [CITE: 40CFR117.2] [Page 121] 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.