When would a facility be required to demonstrate environmental acceptability for the single and multiple TAC scenarios for the entire facility if a modification occurs?
Response: Each construction permit application subject to Regulation 5.21 Section 3 would be required to include a demonstration of compliance with Regulation 5.21 section 2.2.2 (all new or modified (N/M) processes or process equipment (P/PE), HQ of 1.0 for each TAC individually) and section 2.2.3 (all N/M P/PE, risk of 3.8 x 10-6 for all applicable carcinogens). Regulation 5.21 section 2.4 includes the phrase “taking into account the compliance schedule for the various categories of TACs in section 4.5.” If the construction permit is issued before the submittal of the stationary source-wide demonstration of environmental acceptability is submitted or due, whichever occurs first, then the cumulative risk from the construction permit at hand would not be required to address existing P/PE, although the EA goals in sections 2.5.2 or 2.5.3 shall not be exceeded unless a modification of the EA goal is approved. If the construction permit is not issued before the stationary source-wide demon
