I have been a state plumbing inspector since 1994.
In my state the code requires that the ground under the tank be flat and have 6 inches of sand under it. Check you subsurface waste disposal code and see what it says.
Second I'm very surprised effluent is showing on the surface of the ground. If your tank is cracked in the bottom I would sooner think any liquids would filter into the ground. Any tank I have ever seen that leaked under ground eventually plugged themselves with slough from the tank.
Third if you plan on digging up around the bottom of the tank I would strongly recommend you drain the tank first so it does not burst. If you do dig it up you should be able to see if the contractor put sand under it if you code requires it.
Forth if I were going to repair a tank that was cracked on the bottom I would pour concrete on the outside of the tank up to about three inches above the crack and then seal the area where the concrete meets the tank.
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