"This draft permit is issued ... for operation and eventual closure of an on-side hazardous waste surface impoundment known as the "Aggressive Biological Treatment Unit" (ABTU); for operation and eventual closure of an on-side hazardous waste storage tank known as the "K051 Tank"; and for comprehensive closure, in conjunction with corrective action, of two former surface impoundments known as the API Separator Pond (ASP) and the Primary Effluent Pond (PEP). The draft permit also includes corrective action of all Waste Material Management Units (WMMU), including the ABTU, K051 Tank, ASP and PEP, and Areas of Concern (AOC), under WDEQ/HWR Chapter 10, Sections 6(k) and 6(l)."--from the fact sheet introduction.