I had contractor come out to suck my septic tank out , he couldnt find the access lid so he drilled a hole in top to get access . He didnt plug up the hole right away , he just put a temperary lid on it , in the mean time I noticed the hole he dug to get to the tank was full of sewer smelling water . When he came back out to cap it off he said that my drain from the leach field was clogged. I read that a guy had a drywell system . How can tell if I have a drywell or leach field ?