Office of Compliance and Federal Facilities have slightly different definitions of multi-media inspection. The Office of Federal Activities developed a more limited definition.
The definition of what constitutes a Federal facility multi-media inspection for purpose of annual work commitments is defined in the OECA National Program Managers Guidance which can be found at this link http://www.epa.gov/ocfo/npmguidance/index.htm. The definition is in the FY2005-07 guidance (dated May 19, 2004) as follows:
A federal facility multi-media inspection consists of (1) a CAA, CWA, or RCRA program inspection plus at least one additional program under a different statute for the same facility; or (2) some combination of two or more CAA, CWA, or RCRA program inspections at the same facility. To count as a multi-media inspection, no more than three months may have elapsed between an inspection by one program and subsequent inspection by another program.