The phone number at CPRA is (510) 238-3159. Office hours are Monday through Friday, a.m.In addition to the webbased public complaint form you can download and complete this pdf version. Telephone the Alameda County Sheriff's Office Internal Affairs office at (510) 208-9800. Mail a letter describing your complaint to the following location:. Use a separate form for each request. For every IAD investigation, the investigator must fill out a.