It is in the Trout Management Plan, and the statement includes Class B streams as well. A pet peeve of mine is the number of Delayed Harvest Streams that have wild trout populations, anglers are quick to ask for Delayed Harvest Areas because they see "Holdovers" but fail to consider that the fish they think are holdover fish are really wild fish.
Many Delayed Harvest Sections, especially sections just below Class A or B sections will have plenty of wild trout in them. Streams just don't go from Class A or B to no wild trout, that isn't the way wild trout streams work. The gradually change from one classification to another unless something like AMD or other form of pollution impacts them.
I will say it again there are quite a few Class A Streams that are stocked; I've been told the number is 41. There are many more sections just below Class A Sections that are stocked and have been stocked for years. This should not even be done, because 9 times out of 10 there are wild trout in sufficient numbers as to provide a recreational fishery.
The Trout Management Plan is on the PFBC web site.

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Correction: Class A streams are give automatic HQ (High Quality) staus by the DEP. EV is only granted by petition to the EQB (Environmental Quality Board). HQ can still be 'degraded' because of the 'economic hardship' clause in the regulations. EV streams cannot be degraded, with permitted discharges. In all likelihood, Class A streams are EV quality. TU Chapters should petition to have them upgraded. Join with watershed partners if necessary. There is a handbook on how to do this on the Pennfuture website. You have to hunt for it. I'll hunt for it and post in another thread.

I stand corrected, EV status can be attained by a showing of Class A biomass plus any other of a number of factors listed here:

http://www.pacode.com/secure/data/025/chapter93/s93.4b.html

HQ status is a significant limitation on detrimental activities, but apparently not as significant as EV.