However, the seller agreed to perform a soil contamination test before closing, which came back clean.

Many would dump the water right next to the house where it would accumulate into large puddles during bad weather and eventually leak into basements OR even worse saturate the soil beneath your homes footer causing it to sink slightly and causing cracks in your foundation which may let in more water.  

Without them you will probably have water intrusion in your basement/crawlspace and a lot of water around your house effecting the foundation and soil among other things.

We're planning to move into the house on the first.Thanks,Sandy

WI has some poor perk soils so that may shorten the life of the field forcing moving the field which in a park often is difficult.  

Hi BP -Im finally back on U.S. soil from the middle east. 

We have foundation issues up here due to the clay/soil.  

Sandy

does anyone have experience with wood could dations in heavy clay soil?

It does not have wires (owner started rewiring but never finished), no electrical panels, plumbing damages, oil tank leak (potential soil contamination), and leak in gas pipe, AC has problem as well.