Cal. Rev. & Tax. Code § 19009

(a) Whenever any person or employer who is required to collect, account for, and pay over any tax—
1. (1) At the time and in the manner prescribed by law or regulations (A) fails to collect, truthfully account for, or pay over the tax, or (B) fails to make deposits, payments, or returns of the tax, and
2. (2) Is notified, by notice delivered in hand or by registered mail of the failure,
  then all the requirements of subdivision (b) shall be complied with. In the case of a corporation, partnership, limited liability company, or trust, notice to an officer, partner, manager, member, or trustee, shall, for purposes of this section, be deemed to be sufficient notice to the corporation, partnership, limited liability company, or trust and to all officers, partners, managers, members, trustees, and employees thereof.
(b) Any person or employer who is required to collect, account for, and pay over any tax imposed by Part 10 (commencing with Section 17001) or Part 11 (commencing with Section 23001), if notice has been delivered to that person or employer in accordance with subdivision (a), shall collect the taxes, which become collectible after delivery of the notice, shall (not later than the end of the second banking day after any amount of the taxes is collected) deposit that amount in a separate account in a bank located within the limits of this state, and shall keep the amount of those taxes in that account until payment over to the Franchise Tax Board. The account shall be designated as a special fund in trust for the Franchise Tax Board, payable to the Franchise Tax Board by that person or employer as trustee.
(c) Whenever the Franchise Tax Board is satisfied, with respect to any notification made under subdivision (a), that all requirements of law and regulations with respect to the taxes, will henceforth be complied with, it may cancel the notification. The cancellation shall take effect at the time as is specified in the notice of the cancellation.