Is it the end? - I doubt it!
We have the same problem, I've read about the little s*ds and apparently they're very teritorial, having an acre a piece -apprently and can dig 100metres a day in optimum soil conditions, they work 4 hours on 4 hours off.
Apparently even if you catch a mole it is generally not long before it is taken over as moles know it's hard work digging holes.
oh and they move about 4km'hr in their tunels.
There's a knack to setting the traps, which I obviously haven't got as they go around them -except once! not that it made any difference to the quantity of mountains.
If anybody has tips on setting traps I'm all ears
I've heard that those sonic thing are a waste of time, but if they work for you then excellent, I just want them off my lawn! as their hills wreck mower blades quickly.
Oh don't try kicking mole hills when there's a frost about - it'll hospitalise you
Minimum size for a septic tank (fosse septique) is 3000 litres. All installations must conform to DTU64.1 The S.P.A.N.C. technician will verify this. A principle piece is a room without water larger than 7 metres square.