(b) If the department determines pursuant to a review under subdivision (a) that current unforeseen and anomalous market conditions, including, but not limited to, recycling infrastructure conditions, warrant an adjustment to the recycling rates established in subdivision (c) of Section 42050, the department may impose a higher or lower rate for a covered material category subject to both of the following conditions:

1. (1) The rate shall not be adjusted by more than 10 percent of the plastic covered material manufactured for sale, distribution, or import in or into the state for that covered material category.
2. (2) A decreased rate shall be in effect for no more than two years, at which point the rate shall revert to the applicable rate established in subdivision (c) of Section 42050. For an increased rate, the department may determine after each two-year period whether to maintain the increased rate or reduce the increased rate partially or entirely down to the applicable rate established in subdivision (c) of Section 42050.