Ann: CLH Company Update Presentation June 2020, page-4

The $90m PDL write-down ($90m impact to EBIT) took the brunt of this.

They've now published the estimated future recoveries curve. Going toward, investors need to make a judgement whether this curve is a realistic representation - flat collections for 3 years without additional purchasing contributions - or if it's still optimistic based on historical collections and the possibility of future writedowns ensuing.