Don Y wrote:

No experience with septic systems -- but suspect 2000G would be a bit large
for a septic tank!

Not really. I have a 1500 gallon, 3 chamber tank as a part of an advanced
treatment unit. It's poly - OK to walk over, but I wouldn't park or drive over
it. Shouldn't think the precast concrete ones would be a problem. Best to check
with the supplier though.

By the way - we tend to think of routine residential weights (i.e. cars). Don't
forget the occasional delivery/moving truck.