Piper lets you assign multiple threshold sets to a site, and the ThresholdSetScope clarifies each set's authority level. Federal sets reflect EPA MCLs or other national standards. State sets come from state-promulgated cleanup levels. SiteSpecific sets are negotiated cleanup goals unique to that site. Custom sets are user-defined for project-specific analysis. Scoping helps compliance staff understand which thresholds carry regulatory weight and which are informational comparisons.
Technical section
Data model, API, and internals — visible to developers.