Section 82.82 - Definitions(a)Class I substance means any substance designated as class I by EPA pursuant to 42 U.S.C. 7671(a) , including but not limited to chlorofluorocarbons, halons, carbon tetrachloride and methyl chloroform.(b)Class II substance means any substance designated as class II by EPA pursuant to 42 U.S.C. 7671(a) , including but not limited to hydrochlorofluorocarbons.(c)Controlled substance means a class I or class II ozone-depleting substance.(d)Department, agency and instrumentality of the United States refers to any executive department, military department, or independent establishment within the meaning of 5 U.S.C. 101 , 102 , and 104(1) , respectively, any wholly owned Government corporation, the United States Postal Service and Postal Rate Commission, and all parts of and establishments within the legislative and judicial branches of the United States.