I am planning to purchase a condo and during the inspection of the home, I noticed standing water in the basement near the center of the basement floor. I was told that the water was caused by improper grading on the outside of the condo. I did not see the water entry point through the windows or down the walls--just a three- or four-foot puddle of stale-looking water in the middle of the floor. The water seemed to be coming up through the cement floor. Is that possible?