Storage-tank facility indicator

EPA UST Finder ArcGIS FeatureServer, two layers: Facilities (layer 0, UST_FINDER/Integration 299) and Releases (layer 1, UST_FINDER_RELEASE/Integration 300). Static 2018-2021 EPA snapshot, intentionally distinct from the ~19 existing Verified per-state UST/LUST sources — nationwide baseline for states without an individual per-state Source. Deduped on full-row content per layer (not the declared PK alone) after investigating shared-key groups: Facilities dropped 8 true duplicates of 108 shared Facility_ID pairs (100 genuinely distinct facilities kept); Releases dropped 146 true duplicates of 466 shared (Facility_ID, LUST_ID) groups (370 genuinely distinct events kept). Tank-level USTs layer (2.3M rows, no own address/coords) and the two *_by_County polygon-aggregate layers deliberately out of scope — no clean Attribute mapping.