Cal. Health & Safety Code § 118307

Medical waste that is stored in an area prior to transfer to the designated accumulation area, as defined in Section 118310, shall be stored in an area that is either locked or under direct supervision or surveillance. Intermediate storage areas shall be marked with the international biohazard symbol or the signage described in Section 118310. These warning signs shall be readily legible from a distance of five feet. This section does not apply to the rooms in which medical waste is generated.