Update:
I have washed all of the aggregate and have it drying spread out on tarps. For anyone wanting to work with epoxy granite, wash, clean and dry the aggregate. I had issues on a test without doing this.
I washed it by filling 5 gallon buckets with material and then stuck a hose into it and washed it until the water cleared. The larger stones weren't bad but the decomposed granite is really dirty. Anyway, I think you need to remove the moisture out and have things clean when you go to cast.
It is taking longer than I thought to dry - I have raked it out to rotate stuff each day when I come home from work. Looking forward to casting the base this Sunday...