A man from Angels will serve five years in federal prison and for bombing the Calaveras County Government Center in June of last year.
34-year-old Curtis Alan Dudschus also has to repay over 18-thousand dollars restitution.
The bomb went off at the drug and alcohol rehabilitation center, at the county government building, about 9pm one night last summer.
No one was injured in the 2003 explosion.
In December of last year, a search of Dudschus´s mobile home led to the discovery of a blasting cap and dynamite.