Dusti Snider wrote:Our tanks are designed per ASTM standards in residential lawns to withstand approximately 100 pounds per 10"x10" area, and 300 pounds live load in the same 10" square. West Virginia requires, as most other states that we deal with, a stamped PE reviewed shop drawing be submitted to the State and often county Health Departments...
Do you know what ASTM standard that is? It would be interesting to look up what the entire loading requirements are. 400 lbs isn't much if you are considering vehicular traffic.
It's my understanding that the Cub weight STARTS at about 1500 lbs. How many people run them that lightly? TractorData shows the Cub weight as a range from about 1500 lbs to about 3000 lbs. That's easy to see by the time you get ballast in the tires, multiple wheel weights, and a few implements involved.
I think part of this question boils down to regional differences, too. Things are going to be done differently in different locations. Here in Florida, for example, the top of the drain field tubs (can't think of the correct word at the moment) is quite a bit deeper than the top of the tanks. The tanks are usually not even deep enough to grow decent grass over: 4"-6". Usually, outside of the rainy season, you can see exactly where the tank and drain field are in an un-irrigated yard, because the grass over the tank will look lousy, but the grass over the drain field will be stay lush.
There was just a case in the news down here a few weeks ago where a little girl unfortunately drowned in a neighbor's uncovered septic tank. He had broken through it with his pickup truck last year, and hadn't gotten around to fixing it. I'm glad he doesn't live next to me!