Merck owns and operates a medical waste incinerator. The rule requires that they performance test the unit every 12-months. By letter dated February 11, 2003, Merck requested and extension to complete the test. Since no extension can be granted under the NSPS, this compliance order was issued ordering them to submit a test protocol, and complete the stack test upon EPA's approval of such protocol. Finally, they have to submit the test results within 60 days of completion of the test.