Hello it was nice speaking with you today. I completed your serve call for yellow jackets. I applied a liquid residual to the opening in the brick where yellow jackets were entering. I then inspected around the home, deck and fence for other activity but found none. Please allow 5 to 7 days for yellow jacket treatment to take effect. If activity remains after this period, please call for another treatment. Have a great day and thanks for choosing Green Pest Solutions.