I just bought this condo. 4 years ago. Last year the condo. assoc. had repaired an erosion problem in the buildings back yard. Dirt was dug about 3.5 feet deep and pipes were buried redirecting a drainage problem. Since then I have notice cracks in my basement floor and moisture seapage around the cracks. No actual leaks just moisture stains along sides of cracks. The cracks seem to be wider too. Please advice me of what you think could be the problem. Any advice on what to do.