1.1 ,This guide provides a beneficial, acceptable use framework for the development of: (1) Inactive and pre-RCRA (or pre-regulatory) solid waste landfills that are considered orphan or latchkey to be repurposed, despite having offsite migration impacts of landfill gases and/or leachate, albeit at de minimis levels, (2) other types of unregulated waste landfills, (3) sites impacted by chemical releases, (4) legacy or ongoing, intentional, or unintentional fill placement, (5) closed, open, or operating post-RCRA landfills or landfills in the planning stages such that materials may be placed in ways that optimize a landfill's use in future years, and (6) underutilized or heavily used (for example, pedestrian, recreational, or repetitive, entertainment, single event) chemically impacted sites. Also, this guide identifies land usage and conditions of adjacent/non-waste portions of a landfill (that is, buffer areas not within the footprint of an actual landfill or chemically impacted site itself) that should be evaluated before a site use is considered acceptable.