Our house is build into a hillside. the driveway is concrete and had a flat 28 x 30 pad next to the house for parking. The concrete pad is built on piers and there is access to it from the basement. The water lines for the bedroom in the basement pass through this area. We have recently enlarge the hole in the block which gave access to this area thinking that we could use the area for storage. I duly put down 6mm plastic over the dirt. Two weeks later we have a 'pond' on top of the plastic!!! The moisture is dripping from the concrete 'ceiling'. Any idea what we can do to alleviate this problem and create a dry storage area?