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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.
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I could well be wrong, but I believe that is more a coment on the problems of measuring water content, rather than anything to do with actual water in the accident aircraft. The report does say it expected a lower than maximum water content because of ice forming at the bottom of the fuel tanks, so that the fuel circulating would have a lesser ppm of water. What the comment MAY imply is that the tests on fuel either for ground supply or in aircraft sampling may need examination.
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