(c) If the department determines that, for any monthly period, the sum of the voluntary artificial scrap value and payments made from the PET Processing Fee Account pursuant to subdivision (f) of Section 14575, is less than the recycling cost for empty PET containers, determined pursuant to Section 14575, the following requirements shall apply:

1. (1) The department shall immediately provide written notification of the deficiency for that monthly period and the amount of that deficiency to any willing purchaser.
2. (2) A willing purchaser shall correct the deficiency in the next monthly period by adjusting the voluntary artificial scrap value by an amount sufficient to equal the recycling cost for empty PET containers plus the previous monthly period’s deficiency.
3. (3) If the deficiency and amount in arrears is not corrected within 30 days of providing written notice to willing purchasers of empty PET containers, the department shall impose a processing fee pursuant to Section 14575 which includes any amount necessary, including any amount in arrears, to cover the cost of recycling empty PET containers.

(d) If the department determines that, for any monthly period, the sum of the voluntary artificial scrap value and payments made from the PET Processing Fee Account pursuant to subdivision (f) of Section 14575, is greater than the recycling cost for empty PET containers, the department shall do both of the following:

1. (1) Immediately provide written notification of the deviation for that monthly period and the amount of that deviation to any willing purchaser.
2. (2) Provide a credit equal to the amount of the deviation for any future monthly period wherein the voluntary artificial scrap value, and payments made from the PET Processing Fee Account, are less than the recycling cost of empty PET containers determined pursuant to subdivision (d) of Section 14575.