Not knowing where the OP is from or how he came about his package of 1099, I think to myself that he must have purchased it in the middle of Summer. Maybe the yeast was very fresh, expertly handled, and kept at an appropriate temp in a well-run LHBS. But, given the problem, I'll guess not.
I really like a lot of liquid yeast strains, but living in PA and without a LHBS, I have about a 3-4 month window to order them on-line and expect them to remain cold and viable in transit. I envy those with a nearby shop.