Cal. Sts. & High. Code § 8755

Prior to the surrender of any bond or the setting aside of any funds, the treasurer may waive and vacate any notice of advanced maturity upon being tendered for cancellation some other bond or bonds of an equivalent amount and of a maturity not earlier than that noticed, if 10 days’ notice of his intention so to do is first given by mail or otherwise to the holder or owner of the bond noticed for advanced maturity and such holder or owner has not objected to such action.