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Can you isolate the site and leave them alone? Come the cold weather they'll all be dead and gone.See http://www.the-piedpiper.co.uk/th4.htmPeter
The nest will die off as it's done it's job. New queens will leave and find some where warm and dry to hibanate. And so the cycle will start again. Wasps don't usually nest in the same place twice. If you can leave them well alone by the first frosts they will be gone.