California Code, Health and Safety Code - HSC § 114252

(1) At a distance of 30 inches above the floor, in walk-in refrigeration units and dry food storage areas.

(2) At a working surface on which alcoholic beverages are prepared or where utensils used in the preparation or service of alcoholic beverages are cleaned.

(3) Inside equipment, such as reach-in or under-the-counter refrigerators.

(1) At a surface where food is provided for consumer self-service or where fresh produce or prepackaged foods are sold or offered for consumption.

(2) In server stations where food is prepared.

(3) At a distance of 30 inches above the floor in areas used for handwashing, warewashing, and equipment and utensil storage, and in toilet rooms.

(4) In all areas and rooms during periods of cleaning.