I have a mulched Churches play area. Typical broadleafs, nutgrass, and blackberry coming up. I have to use a combination broadleaf, MSMA, and Bk32 killer to get it all. Honestly worried about using too much and the kids. Only spot spraying as needed. I always spray on Thurs or Fri which is at least 2 days before Sunday service. According to the labels I am good, I just wonder about long term. Sandy under layment that drains well. How would snapshot or treflan do? Safer, or do I need to resort to pulling by hand?