California Code, Penal Code - PEN § 914

(a) When the grand jury is impaneled and sworn, it shall be charged by the court.  In doing so, the court shall give the grand jurors such information as it deems proper, or as is required by law, as to their duties, and as to any charges for public offenses returned to the court or likely to come before the grand jury.

(b) To assist a grand jury in the performance of its statutory duties regarding civil matters, the court, in consultation with the district attorney, the county counsel, and at least one former grand juror, shall ensure that a grand jury that considers or takes action on civil matters receives training that addresses, at a minimum, report writing, interviews, and the scope of the grand jury's responsibility and statutory authority.

(c) Any costs incurred by the court as a result of this section shall be absorbed by the court or the county from existing resources.