Thank you for your comments!
It's like a fabric liner... still remove it?
I live in the country, so I assume (and maybe I'm way wrong) but I assume it goes to the well or sewer?
After paying close attention on my walk today at work, I noticed a lot of people have this river rock & they are still able to get nice big bushes to grow in that environment. I must just have to move the rock, cut the liner, & plant.