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This source category permit and associated applications cover the construction and operation of certain stationary diesel-fired emergency generator sets and other diesel-fired emergency engines subject to the federal “Standards of Performance for Stationary Compression Ignition Internal Combustion Engines” (NSPS Subpart IIII) and the air quality regulations of the District of Columbia. The first is an initial application form for any equipment that has not previously been covered by an air quality permit, including new installations. The second is a shorter renewal application form for any equipment that was previously approved for coverage under the previous version of this source category permit (Permit No. 7048-SC, issued September 30, 2015) and has not had significant changes to the equipment or operations since the previous coverage approval.