I asked the Chesterfield Emergency Management Coordinator and here is her response:
Thank you for your email. I appreciate your contact regarding the safety of Chesterfield County citizens. The police force and fire departments of a locality have the responsibility to safeguard life and property. Chesterfield Police were doing that at Glebe Point, because of the presence of explosives. The police were working in conjunction with the fire chief and I do not know of anyone who refused to leave once they were informed of the potential danger. The Fire Chief, under Virginia Administrative Code 13VAC5-51-101. Section 110.5 "Evacuation: When, in the fire official's opinion, there is actual and potential danger to the occupants or those in the proximity of any structure or premises because of unsafe structural conditions, or inadequacy of any means of egress, the presence of explosives, explosive fumes or vapors, or the presence of toxic fumes, gases or materials, the fire official may order the immediate evacuation of the structure or premises. All notified occupants shall immediately leave the structure or premises and no person shall enter until authorized by the fire official." F.110.6 also says," Unlawful continuance: Any person who refuses to leave, interferes with the evacuation of other occupants or continues any operation after having been given an evacuation order shall be in violation of this code." The statutory Authority is under 27-97 of the Code of Virginia and has been adopted by Chesterfield County under Chapter 10 of the county code.