A bit high . . . .

OK, the tank is level, and OK, it has an appropriately minimal pitch away from the cottage.  However, being seated about 3-4 inches deeper would have been optimal.  But we can't complain:  it all works!

In this picture, the tank aspect nearest the lake is even with the lawn, and the aspect nearest the woods is  5"-6" below grade.  Overall, this is just a bit high for the grade of the lawn. So the net result is that the turn in the driveway will need to be a bit higher than the original, with more pitch toward the grass and lawn.