What is at the end of my driveway in the snow/ice? It appears to be bubbling up from under the sidewalk. First showed up about a week ago and has grown in size significantly the last 2 days. Brand new build, no drainage from house near this area, don't use salt or chemicals for winter/ice, only driveway on the block having this issue. Can also see it along the sidewalk. No fluid from vehicle has been spilled or leaked. I have seen another new build do this in a different neighborhood and they too are the only ones with this at the end of their driveway.