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.
But if you are given 6 months visa, you have to go to U.S. within next 6 months, else it will expire and you will have to apply for new visa. If you get 10 years visa, it is not mandatory to go to U.S. within a specified time period. You can go to the U.S. anytime within next 10 years.he maximum validity for B1/B2 visas for Indian citizens is 10 years. This is based in principle on reciprocity. (Note: For all other categories, however, the maximum validity is 5 years or less.) The consular officer may limit the visa to a shorter validity, if he feels this is justified.