Prior to the beginning of each marketing season, the commission may establish a voluntary minimum assessment rate applicable to vintners who process winegrapes in the marketing season in a quantity of 100 tons or less and who are exempt from paying the assessment established pursuant to Section 74651. Notwithstanding any other provisions of this chapter, any vintner who voluntarily pays the minimum assessment shall be granted the same rights and privileges as vintners processing over 100 tons in that marketing season.

Any vintner who is also a producer who processes winegrapes shall pay the assessment on the winegrapes. The “weighted average producer returns per ton” by district as published in the most recent Final Grape Crush Report issued annually for the current marketing season by the department shall be used as the basis for determining product gross dollar value and the assessment on the winegrapes where no sale is involved.

Unless otherwise exempted by this chapter, the assessment provided for in this article shall be levied on vintners and vintners who are also producers who engage in the act of processing winegrapes into must for the purpose of making grape juice, grape concentrate, wine, or products thereof, including high proof or brandy or processing field crushed must for the purpose of making grape juice, grape concentrate, wine, or products thereof, including high proof or brandy.

This chapter does not apply to winegrapes processed only for a vintner’s home use. However, any vintner claiming this exemption shall file an affidavit with the commission establishing the manner in which the winegrapes are used. The commission shall then determine whether the exemption applies.

Every vintner shall keep a complete and accurate record of all winegrapes processed. The records shall be in simple form and contain information as the commission shall prescribe. The records shall be preserved by the vintner for a period of two years and shall be offered and submitted for inspection at any reasonable time upon written demand of the commission or its duly authorized agent.

All proprietary information obtained by the commission or the director from producers or vintners, and all lists of vintners in the possession of the commission or the director are confidential and shall not be disclosed except when required in a judicial proceeding. Information on volume shipments, commodity value, and other related information which is required for reports to governmental agencies; financial reports made to the commission or aggregate sales and inventory information; and any other information which is requested from the commission, may be disclosed by the commission. In no event may individual producer or vintner information be disclosed by the commission.

Any assessment levied by the commission, pursuant to this chapter, is a personal debt of every person so assessed and is due and payable in a time and manner prescribed by the commission.

Any person who fails to file a return, or remit or pay any assessment within the time required by the commission shall pay to the commission a penalty of 10 percent of the amount of the assessment determined to be due and, in addition, 11/2percent interest per month on the unpaid balance.

Any vintner receiving an exemption or refund pursuant to Section 74658, shall, in addition to the requirements of Section 74654, maintain sales invoices and any other business documents specified by the commission as necessary to verify the claim. The records shall be preserved by the vintner for a period of two years and shall be offered and submitted for inspection at any reasonable time upon written demand of the commission or its duly authorized agent.

No refund pursuant to Section 74658 shall be approved by the commission after two years from the date the assessment was due. Failure to file a claim within the time prescribed in this section constitutes a waiver of all demands for a refund against the commission.

Within 30 days, after disallowing any claim in whole or in part, the commission shall serve written notice of its action on the claimant.