Section 270.106  Standard Industrial Classification (SIC) Code

"Standard Industrial Classification (SIC) Code" means the 2-, 3-, or 4- digit code for a source based on the primary activity conducted at the source, as determined from the Standard Industrial Classification Manual (1987), Superintendent of Documents, U.S. Government Printing Office, Washington, D.C. 20402, incorporated by reference in Section 270.108 of this Part.