What is the biblical basis for God being omnipresent?

I believe that God is omnipresent, but what are some Bible verses that back this up? Here are some counterarguments: >Exodus 3:16 >"...**I have surely visited you** and seen what is being done to you in Egypt." > > Genesis 28:12  And he dreamed: There was a ladder set up on the earth, and its top reached to heaven; and there the angels of God were ascending and descending on it. > 28:13  **And there was Jehovah, standing above it**..."