Before we bought our house, a moisture control system was installed on one side of our basement. The channel runs along the foundation and ends at a sump pump. This channel was filled in with concrete so the floor is unbroken. There is a black corrugated plastic sheeting that is embedded in the concrete right up against the wall, it runs the whole length of the channel to the sump pump. It sticks up about 4 inches out of the floor. Can I trim this off? I believe it allows air down into the channel so the water can run? That's a guess. It just catches everything and is hard to keep clean.
Update 4-23-16 - I was finally able to cover the plastic, I wanted to post a pic. Peeling away the plastic I could see the dampness behind it, trimming it flush with the floor would have been a mistake. I used a pre-painted 1x4 from my local big box home center, that is screwed directly into the concrete with concrete screws and finishing washers. The plastic trim acted as the spacer, so the 1x4 sits pretty straight. I then nailed a trim piece to the top to cover the plastic and seal it over. I plan on running a dehumidifier to keep the dampness down, so I wont be caulking the seams, which should allow the plastic to breath and hopefully dry out.