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 validity of a Chinese visa can be anywhere from 3 months to 9 years depending on the type of visa you request. Normally a single entry visa is valid for 3 months, a double entry visa for 6 months, a multiple entry visa for 1 to 9 years depending on your passport validity. The validity of a visa starts from the date of issue, and applicant needs to enter China before the expiration date listed on the visa.