Check the entry under the Alchemy heading on the srd.
An alchemist can utilize spell-trigger items if the spell appears on his formulae list, but not spell-completion items (unless he uses Use Magic Device to do so).
Scrolls are spell-completion items, so Alchemists cannot use them. The ability or inability to read magic is not a factor here.
In other words, alchemists (assuming full alchemists here) always have to use UMD to use scrolls.
I'm pretty sure you will be waiting a long time for an "official" ruling on this question; it's a very basic question that is handled by a careful reading of the rules. No real need for a Paizo employee to step in and answer.