| PFAS compound profile, method quality, source variation and co-contaminants | Analytical evidence is representative and decision-capable | Audit sampling materials, blanks, custody and laboratory method | PFAS source, method and regulatory evidence dossier |
| Destination requirements, product claims and source-alternative options | Selected route addresses the relevant PFAS profile and background water | Run representative treatment trials and mass balance | Treatment option and residual lifecycle comparison |
| GAC, ion exchange, membrane or other treatment performance evidence | Breakthrough or performance loss is detectable before release risk | Model and then trend media or membrane performance | Validated operating, monitoring and breakthrough plan |
| Flow, pretreatment, media life, concentrate, disposal and lifecycle capability | Spent media, regenerate or concentrate has an approved disposition | Verify residual storage, transport and disposition documentation | Product-hold, media-change and change-control procedure |