I would think they could/would leak while being used also, at least the ones I have worked on or around seemed to leak more running than off at night… When I was doing the commercial and industrial equipment for the Masonry company, we had a few contracts up at Fort Campbell and what a PITA to do any work/maintenance on them, Very strict equipment standards up there… I would think the same could be had when being used around in the well water places, also diapers can be used for many small leaks, just a pain to deal with when time for repairs or maintenance…
I had to design and build a custom hinged dumpable sand box for the side of our main mortar mixer with compartments (x amount of sand per bag of mix) that the engineers took multiple daily samples of… Meaning they were a huge pain to deal with… So I’d imagine the same could happen anywhere when well water was a concern…
We left all the equipment on the job site, as well as all the different projects being built at the time from other company’s… Time frame, 2001- 2002, so right after 9/11…
We had to either buy a new Lull forklift (1044) or had just bought one, but only the newest equipment went up to Fort Campbell, if something happened then we either had to replace with fairly new or rent a new(er) equipment…