Get a beekeeper out to the property. If they are Vespids, (wasps, hornets, yellowjackets) they are aggressive carnivores that will attack you. You cannot live with Vespids on your property- they must be destroyed. (The ENTIRE nest must be dug out and destroyed- spraying the top does not kill the underground inhabitants.)
If they are Apis (Honeybees) they are herbivores, and will not attack unless provoked. (If they are Africanized bees, though, treat as Vespids.) If they are Apis, the beekeeper will try to take the colony, as many beekeepers get their colonies from wild swarms. Some charge, but it is worth it. Go on craigslist, or call the county- they usually have beekeepers on call for this sort of thing. Don't do it yourself- you could be injured or killed. ( I was in a bee suit last week, and still got stung 5 times, by honeybees.)
Some things you can do to trap them. Mountain Dew, 2 Liters open top, half full, a few drops of dish soap to trap them. They will enter, and drown. Also, the salmon trap works well.(
http://www.alaskaoutdoorjournal.com/Dep ... ket50.html ) Just put the traps away from your pool, so you don't inadvertently draw them in.
And for what it's worth, a fountain between you and bee territory can do a world of good, as far as keeping bees out of the pool.
Here's a picture of our fountain, by our hives, thirty feet from the pool. They don't come to the pool, though, because once they learn a water source, they use that source.