Just PM'd you and one application for the DW was sufficient for me.
And if I didn't mention in the PM, one application COULD remain in your BOW if there's no in-flow or out-flow, into the second year and maybe the 3rd.
It Depends
Oh, and the application rate depends on how many acre-feet you're treating and what's being targeted. I believe the application rate for DW is 45 ppb (or 70 ppb?).
Keith