School with unusually large amount of artificial turf

100% of the athletic areas for an urban school are made of artficial turf. It's my understanding that this would be counted as hardscape under SSc5.2. There is a clause in WEc1 that allows a team to not count playing fields for the irrigation credit. It's not clear to me whether or not that also means that playing fields, if not counted relative to WEc1 could also not be counted toward SSc5.2 (and SSc7.1). The reason I'm bringing this up is because it appears likely that the artifical turf will blow our ability to say that 25% of the open space is vegetated. However, if we don't include that area, we'll still have 20% open space on the site including vegetation and pedestrian oriented hardscape. Any thoughts regarding whether inclusion of the artificial turf in the open space calc is required would be most welcome.