D.C. Mun. Regs. tit. 18, § 756
756.1 Quality assurance procedures necessary for the federal transient emissions test shall meet the performance standards established in 40 CFR Parts 51.359-51.367 or a U.S. Environmental Protection Agency approved equivalent.
756.2 Equipment calibration procedures necessary for the federal transient emissions test shall meet the performance standards established in 40 CFR parts 51.359-51.367 or a U.S. Environmental protection Agency approved equivalent.
756.3 Detailed procedures used to perform the quality assurance and equipment calibration procedures necessary for the federal transient emissions test shall be included in the Vehicle Inspection Manual.