Secondary containment requirements are addressed by the Environmental Protection Agency (EPA) through the Resource Conservation and Recovery Act (RCRA) contained in title 40 of the Code of Federal Regulations (CFR) part 264, the 2006 Uniform Fire Code (UFC) in standard 60.3.2.8.3 and in the 2012 International Fire Code (IFC) in 5004.2.
You should check your visa endorsement for the period of your stay in Zambia. Although you are allowed 90 days per calendar year the immigration officer will not normally endorse the full length of time upon entry and you will be required to extend the stay at the nearest immigration office.
A visitor visa may be for single entry or multiple entry use. Single entry visas may be issued up to six months before the expected date of travel. The maximum validity date for multiple entry visitor visas is up to five (5) years or one month prior to the expiry date on the passport/re-entry visa, whichever is earlier.