State regulations on daily cover approval can vary in terms of the materials allowed, testing requirements, and documentation procedures. Some states have lists of pre-approved materials, while others require landfill operators to submit detailed proposals and test results to demonstrate that a material provides the same level of protection as soil.
Requirements may differ for thickness, application methods, or monitoring practices, and certain states may restrict the use of specific materials due to environmental or health concerns. Inspection and reporting standards can also vary, with some agencies conducting frequent on-site checks and others relying more on operator records. These differences mean that a material approved in one state might need additional review or modifications to be used elsewhere.
