California Code, Penal Code - PEN § 4008

A copy of the appointment, certified by the clerk of the court, must be served on the sheriff or keeper of the jail designated, who must receive into the jail all prisoners authorized to be confined therein, pursuant to Section 4007, and who is responsible for the safekeeping of the persons so committed, in the same manner and to the same extent as if the sheriff or keeper of the jail were sheriff of the county for whose use the jail is designated, and with respect to the persons so committed the sheriff or keeper of the jail is deemed the sheriff of the county from which they were removed.