Impounding Area 1 : An area defined through the use of dikes or the site topography for the purpose of containing any accidental spill of LNG or flammable refrigerants
NFPA 59A Standard for the Production, Storage, and Handling of Liquefied Natural Gas (LNG), 2009 ed. http://www.giignl.org/sites/default/files/PUBLIC_A REA/About_LNG/4_LNG_Basics/lng_4_-_operational_int egrity_7_3_09-aacomments-aug09.pdf, (Std: Prod, Storage, and Hndlg of LNG - Amer) {215 NFC}