Good morning. Today I completed your one time service for yellow jackets. I saw the activity flying in and out of the foundation on the right side of the home. I applied a liquid treatment to the void. Please avoid the area for a few days. The yellow jackets are agitated and will sting. I am setting up a follow up next week to inspect and remove the nest in the basement. Please allow 10 to 14 days for our products to take effect. Thank you for choosing green pest solutions. Have a great week!