That's OK, its plenty close enough for what we need to do today.
You need to get granular CYA soaking in front of a return in a sock, carrot on a stick style, so it doesn't touch the wall.
Your FC will burn off in an hour or two without any CYA, so keep tabs on it a few times a day until the CYA is registering on the test. Do *NOT* just go crazy with CYA though. It only comes out quickly by draining, so be patient after adding to ensure it has time to mix/disolve. Also, the builder may be overestimating your gallons and you overshoot the target because of it. Get 20 CYA going and creep up the rest.