Exposing & developing Provia 100 sitting in room temp for three years

[bkarasek]

I was cleaning a stack of 8x10 double sided film holders and found one that still had a sheet of film in it, 8x10 Fuji Provia 100 transparency film. I last shot Provia 3 years ago and this one film did not get exposed. It's been sitting in the basement, adjacent to the darkroom, at room temperature 70°/80°, depending on the season (darkroom is air conditioned 68°), so the question is, how I should expose the film?
Will a standard reading off a 18% grey card be alright, or should I overexpose, and if so, by how much?

Regarding developing, I'm taking the sheet to a lab that still does 8x10 transparency film. What instructions should I give them?
I know, it's just one sheet of film, but it is a gorgeous film, the colors are very natural, not saturated, so I would hate to waste it.. and I'll be up on the roof in the next few days, and want to take the shot from up there.

Thanks in advance!

 

[pentaxpete]

Give it half a stop more exposure.

 

[removed account4]

Give it half a stop more exposure.

+1

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that said, ive been exposing a ton of provia lately,
developed in coffee and dektol it makes a beautiful b/w negative !