Here is some stuff that I used to use in Rural Electrical Substations. At that time I was a certified applicator for right-of way kills everything.
If you can fine Spike, it will do the trick for minimum of Five Years
Arsenal works well
Krovar is another that works well, but need a mix of Diuron.
Those are the ones I am familiar with. and that is why you see substations and no vegetation growing.
Not sure of the cost, it was supplied to me.
I have mix rates at the house I used to use.
Lastly, any of the mentioned above may not be good around water, but that depends on what the label states.
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