It was $17,000 to remediate the soil after the oil contamination.  

If they decide to move after that, they will be in breach of the lease agreement.It is very possible that a pet stain has soiled through to the pad.  

move soil, stone ?

We do both commercial and residential landscaping.I will be the first to let you know that landscaping before and after shots are poor ideas for landscaping ideas.Landscaping is about use of the current environment and light availability combined with new colors added by additional plant life, soil & mulch, and hardscapes.Each landscape scenary should be custom built to the equally unique property, which colors and shapes selected to fit the personality of your property.

Check your grading - soil should be graded away from foundation.  

There is a leak in the front of the house next to a hose spicket and I want to believe that the leak is under the soil near the spicket and hopefully not under the slab.

Or if at some point someone textured over wallpaper and painted it.Texas has expansive clay soil.

Sand is one option but I have heard about a expanding foam that some epa approved company has.

Sandy S Harris - I don't remember which book of Stanley's it was in, I think one of the early books, but he tells of how he was interviewing deca-millionaires.

Since soil conditions, grade, rainfall and runoff, etc vary so greally from locale to locale, you need someone from that area to consult.