Renovation (occupancy never stopped) / 24-hour operation

Hello, I am working on a project in Brazil with specific conditions that have brought up 2 questions concerning this credit. I'd really appreciate any opinions! 1) It's a major renovation + addition, but some portions of the existing area had almost no interventions. The bottom line is that occupation was never 100% interrupted, with the occupied areas always being isolated from the construction fronts. To complicate a little bit more, we're talking about a factory, so occupancy can't be interrupted completely because production can't stop. For both Options 1 (Flush-Out) and 2 (Testing), the respective action (flush-out or testing) must at least partially occur prior to occupancy for credit compliance. For the new areas, that's fine. But for the existing production + administrative area, "prior to occupancy" doesn't actually exist for part of this project. The main production area didn't undergo any major construction works. How can we still pursue the credit? Would it be acceptable to perform IAQ tests as soon as construction is finished but while the existing portion of the building is occupied? Or, if not, to halt operation for a few days as soon as construction ends to begin the flush-out or perform the testing (if the Client is OK with that)? Or can the production and administrative areas where almost no interventions were made be excluded from flush-out / testing requirements, with an explanation to the USGBC showing which areas had almost no construction interventions? 2) Option 1, Path 2: For Phase II, "during each day of the flush-out period, ventilation must begin a minimum of 3 hours prior to occupancy and continue during occupancy" (Reference Guide, p.461). However, the factory runs 24 hours/day, so would the correct approach be to maintain the flush-out during 24 h/d every day until the 14000 cf/sf are reached? Sorry the question got so long... Thanks for any input! Alex