You can dig into sand vein and pack with clay ,but water pressure could push through or around . Tough to say without seeing the layers and how they lay. If you have good water supply and shed area might want to give it a chance. They all leak but it is the leak you see that gets your mind going
Good Luck
Scott


Scott Trava
Catskill Pond
http://catskillpond.com
scott@catskillpond.com
Returning Catskill Waters To A Simpler Time
EST. 1923