41 C.F.R. § 109-1.5106 Segregation of personal property.
Title 41 - Public Contracts and Property Management
Ordinarily, contractor-owned personal property shall be segregated from Government personal property. Commingling of Government and contractor-owned personal property may be allowed only when: (a) The segregation of the property would materially hinder the progress of the work (i.e., segregation is not feasible for reasons such as small quantities, lack of space, or increased costs); and (b) Control procedures are adequate (i.e., the Government property is specifically marked or otherwise identified as Government property).
Title 41: Public Contracts and Property Management
PART 109–1—INTRODUCTION
Subpart 109–1.51—Personal Property Management Standards and Practices
§ 109-1.5106 Segregation of personal property.