I have 3 holes in my basement foundation. The smallest one makes sense because its just a pipe and that is were we drain our washer water. The other 2 bigger ones dont make sense. Right now they are full of mud but normally they have water in them. Does anyone know what these are for? IS this something that is dangerous radon wise or in any other way. Also can I clean them up and then fill them in with some concrete or gravel or something?
