Mary confronted this critter in the garden, whereupon it fled into the compost bin:
She barricaded it with spare tomato cages across the bin’s entrance, I wedged an aluminum sheet behind the cages, and we got the stinkeye for our efforts:
I deployed the hose, watered it for a few minutes, and we left it to consider its options. Groundhogs are pretty much waterproof, but we hoped the wetdown would be sufficiently unpleasant to mark the garden as “Here be dragons” in its mental map.
After an hour, it had vanished. We know from past experience that groundhogs can climb up-and-over the chain link fence surrounding the compost bin (it was a dog pen for the previous owners), although it knocked down the aluminum sheet and may have exited through the garden.
It looks well-fed and ready for winter.
Searching for groundhog will reveal previous encounters with its ancestors & relatives.
The Smell of Molten Projects in the Morning 
All your base are belong to us … except in the case of relocation (with a live trap, but I didn’t say that). They are persistent little devils.