The report still doesn't explain where the additional water might have come from.
Phil, I beleive it does at least
allude to where it came from...
The varied (and higher levels) of water can come from less than homogeneous distribution in the tank, but mainly from prior upstream ice melting, either from the boost pump screens or from pipewrok less far upstream.
As I took it to mean ppm at the point of interest e.g. in the pylon pipework or adjacent main tank pipework.
I believe they also inferred that concentrations could vary wildly from time to time in the fuel passing through the critical pipework sections, up to possibly 125ppm.
.. without of course re-reading or quoting directly.