VALLEY SPRINGS — Authorities have arrested a Toyon Middle School custodian who threatened a co-worker and allegedly mentioned bringing a firearm on campus, the Calaveras County Sheriff’s Office reported.A Toyon Middle School administrator contacted the Sheriff’s Office on Monday afternoon to report 72-year-old Fred Westbrook of Mokelumne Hill, who had threatened a colleague at the school, according to the report.[gh:iframe src="https://www.google.