This is what we ran into yesterday. Mark called me and said, "you have to see this. We have extremely weak soil here." I asked, " What, do we need to do a typical overdig?" He laughed. He then proceeded to tell me that the area with weak soil was 28' x 12'. I thought, "Oh s**t, I hope he's overreacting. Well, he wasn't. I went out this morning and discovered he was right. It appeared as though the builder did an extreme overdig for whatever reason. If you look at the pic, you can see that the overdig follows the bump out. It was almost a perfect line between suitable and unsuitable ground. Together, with the engineer we consult with, we came up with a plan and began to address the problem. We also had to inform the homewowners that the $35,000.00 project just turned into a $38,500.00 project if they wanted our warranty. I still get uncomfortable making that phone call. However, I would feel more uncomfortable not making it. Also, as usual, we offered third and fourth party verification of our findings.