Q.Trees sprouting in yard
We cut down a golden locust tree last year. Did cross cuts and applied herbicide. Now we are fighting sprouts in our yard 30-40 feet away from the tree stump. We have also drilled holes in the top and sides of the short stump and poured Ortho A-40 down the holes. We have tried digging down next to the stump and pouring rock salt and Clorox there. What else can we do?

You can cut down the sprouts and paint the cut ends with the full strength herbicide. They will take up the chemical through it's system and help kill the main roots. It can take multiple treatment.
https://www.gardeningknowhow.com/ornamental/trees/tgen/how-to-kill-a-tree-killing-trees-in-your-garden.htm
https://www.gardeningknowhow.com/ornamental/trees/tgen/kill-zombie-tree-stump.htm