The leaseholder or an operator hired by the leaseholder files an application for permit to drill (APD) and a surface use plan of operations.

APD Review in BLM Field Offices
Operations expected to have significant impacts are analyzed with an environmental impact statement (EIS). Activity not expected to have significant impact may be analyzed with an environmental assessment (EA).
downhole surface
geological archaeological
engineering realty
environmental
wildlife, air/soil/water, vegetation
cultural/historical
NEPA documentation:
depending on significance of impact

The BLM approves, approves with modifications, denies, or defers action on the application.
The BLM cannot approve an APD until the requirements of certain laws and regulations have been met – including NEPA, the National Historic Preservation Act, and the Endangered Species Act.
An approved APD is valid for two years or until the lease expires, whichever occurs first.
Market conditions and other factors determine when wells will be drilled.