There is a mound in the woods behind my house that has old trash sticking out of it. There is evidence of a old home nearby. I have dug a few holes and unearthed newer trash but am sure it's an old dump place. The mound is about 15 feet high with a smaller mound beside it. My question is should I start digging into the sides of the mound or at the top where the cover soil has washed away? There are a few young trees growing on it but look like they grew after the trash was covered up. How deep should I dig? I'm new at this so any help will be appreciated.