Good morning I completed your service today. I started by identifying the exterior entrance and the entrance in the basement. The yellow jackets are entering from a small hole by the front steps. The entrance in the basement seems to be around the window. I use blue painters, tape to seal up in a possible openings in the basement. I then treated the exterior entrance with a liquid residual for stinging insects. Try to avoid the front yard for a day or so. Please allow at least a week for the treatments full effect. If you have any questions or concerns, please reach out to the office. Thank you for choosing Green pest solutions.