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I would go to their web site which you can find and contact them via email.
The dates I would guess will vary according to weather changes. What you can do is just keep an eye out when you see several days with a route Variant in the mid 40's. When you see a weeks worth of these or sprint variants in the 30's they have put their winter chemicals into the race surface.Once the track is winterized you will not see sprint variants in the teens anymore.
You can also look at some old racing forms and look at enough of them to get an idea in the horses pps when the higher track variants show up.
Mike.
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