(a) Not later than 30 days after the end of each calendar quarter, the commissioner of administration shall determine, as of the end of that quarter, the fiscal year's

(1) unreserved and unobligated balance in the response account of the oil and hazardous substance release prevention and response fund established in AS 46.08.010; for purposes of this paragraph, the “unreserved and unobligated balance in the response account” means the cash balance of the account less the sum of

(A) reserves for outstanding appropriations from the account;

(B) encumbrances of money in the account; and

(C) other liabilities of the account;

(2) balance of the account maintained under AS 37.05.142 that accounts for the proceeds of the surcharge that are deposited in the general fund;

(3) the balance of the response mitigation account established by AS 46.08.025(b) that originated from the sources described in AS 46.08.025(a)(3) and that is available for appropriation to the response account of the fund established in AS 46.08.010.

(b) Within 15 days after making the determinations required by (a) of this section, the commissioner of administration shall

(1) add the amounts determined under (a)(1) - (3) of this section; and

(2) report the sum calculated under (1) of this subsection to the commissioner of revenue.

(c) In making the determination required by (a) of this section, the commissioner of administration may not consider money described in (a) of this section that is subject to a dedication imposed by law that restricts the use of the money to a specific purpose for which the response account of the oil and hazardous substance release prevention and response fund established in AS 46.08.010 may not be lawfully expended.

(d) If the commissioner of administration reports that the sum reported under (b) of this section equals or exceeds $50,000,000, the commissioner of revenue shall suspend imposition and collection of the surcharge levied and collected under AS 43.55.201. Suspension of the imposition and collection of the surcharge begins on the first day of the calendar quarter next following the commissioner's receipt of the commissioner of administration's report under (b) of this section. Before the first day of a suspension authorized by this subsection, the commissioner shall make a reasonable effort to notify all persons who are known to the department to be paying the surcharge under AS 43.55.201 that the surcharge will be suspended.

(e) Except as provided in AS 43.55.231, if the commissioner of administration reports that the sum reported under (b) of this section is less than $50,000,000, the commissioner of revenue shall require imposition and collection of the surcharge authorized under AS 43.55.201. If the surcharge is not in effect, reimposition of the surcharge begins on the first day of the calendar quarter next following the commissioner's receipt of the commissioner of administration's report under (b) of this section. Before the first day of reimposition of the surcharge authorized by this subsection, the commissioner shall make a reasonable effort to notify all persons who are known to the department to be required to pay the surcharge under AS 43.55.201 that the surcharge will be reimposed.