Above ground pool and deck removed from property 3+ years ago. Last year drought kept all of lawn from being green. The year before record rainfall had grass growing at rates that were not reasonably controllable. So far this year has been reasonable and seems like a good time to address this issue. I already, aerated, dethatched, fertilized and brought in some new topsoil for that area, but a near perfect ring of brown grass and weeds remains in the lawn. How do I deal with this?