Most of the open land is owned by the State.
What the state wont come accross with 10 acres to bury a state problem?
Then the state (read Butch Napolitano) would formally have to admit there is a problem and put funding to it.
You have to understand the Greenies, Feds, and Nature Conservancy have designs on all the open spaces in and around Tucson. There has to be an environmental study done to insure there are no archaeological, or endangered/protected species (other than US Citizens) on the property, as well as City, County and State zoning laws.
If you have money you can do anything.
Pima County is stuggling with growth. Pima County has to pay for the hospitals for the indigent illegals as well.