I noticed I have 2 fairly young Poplar Trees in my back yard. I would like to dig them up and move them to another area in my back yard. They are approx. 4 feet tall already and leafy. They look small enough to dig up. However, I would like to move them to another area of my yard. I know I have a septic tank in the back. Its obvious where the septic tank is because of the darker green grass. How far away can I plant these trees without interfering with the septic tank. Also, do you have any advice for when and how I should go about digging it up. I'm eager to plant these shade trees. Thanks!!!!!