I don't know anything about the cemetery laws here in the states, but yes individuals do own cemetery lands, note I was only speaking of one cemetery plot owned by Arabs and these particular one they dig the graves, there is no other way of explaining the grave yard is so small, I have personally seen previous grave yards getting reused again. However, Somalis do also own cemetery plots, on the west side I don't know what goes on there. What I do know is the Arab cemetery is in close proximity to Somali populated areas & and Somalis bury the dead quick on the same day, this might explain why they use this particular cemetery.
Sidi
It should be a concern for the community if they don't want the remains of their loved ones chucked in the landfills. They should approach the owners and ask them these questions.