California Code, Penal Code - PEN § 896

(a) Immediately after an order is made pursuant to Section 895, the court shall select the grand jurors required by personal interview for the purpose of ascertaining whether they possess the qualifications prescribed by subdivision (a) of Section 893. If a person so interviewed, in the opinion of the court, possesses the necessary qualifications, in order to be listed the person shall sign a statement declaring that the person will be available for jury service for the number of hours usually required of a member of the grand jury in that county.

(b) The selections shall be made of men and women who are not exempt from serving and who are suitable and competent to serve as grand jurors pursuant to Sections 893, 898, and 899. The court shall list the persons so selected and required by the order to serve as grand jurors during the ensuing fiscal year of the county, or until a new list of grand jurors is provided, and shall at once place this list in the possession of the jury commissioner.