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.
The visa validity and duration of stay per visit is at the discretion of the Brazilian Consulate. Long-duration visas (valid for 5 or 10 years, for instance) are valid from the day they were issued. Short-duration visas (valid for 30 or 90 days, for example) are valid from the date of first entry into Brazil. All visa holders, regardless of nationality or visa validity date, may only stay in Brazil for up to 90 days per year, unless otherwise noted on the visa.