Section 76.7 - Revised NO[X] emission limitations for Group 1, Phase II boilers(a) Beginning January 1, 2000, the owner or operator of a Group 1, Phase II coal-fired utility unit with a tangentially fired boiler or a dry bottom wall-fired boiler shall not discharge, or allow to be discharged, emissions of NOX to the atmosphere in excess of the following limits, except as provided in §§ 76.8 , 76.10 , or 76.11 : (1) 0.40 lb/mmBtu of heat input on an annual average basis for tangentially fired boilers.(2) 0.46 lb/ mmBtu of heat input on an annual average basis for dry bottom wall-fired boilers (other than units applying cell burner technology).(b) The owner or operator shall determine the annual average NOX emission rate, in lb/mmBtu, using the methods and procedures specified in part 75 of this chapter.60 FR 18761, Apr. 13, 1995, as amended at 61 FR 67163, Dec. 19, 1996