Level Streaming Question: How do I delete a level from memory and create same level into memory?

I was able to use Level Streaming in order to change my levels instantaneously, however the memory itself takes a huge toll because of the levels being loaded in the project without being actually accessed by the player. I do know that this is how Level Streaming works.
Is there a way to, first, delete from memory the level that I want to unload, and second, create and load it instantaneously into memory?