Know your data sources.

Alaska DEC — Spill Prevention & Response (SPAR) contaminated-sites database. Active spills, cleanup-complete sites, LUST (leaking underground storage tank), institutional-controls overlay. - searchContaminatedSites ⭐ ~8.8K sites. Filter borough/siteName/status/lustOnly/city/staff/ancsaOnly - getSiteById, getServiceInfo §0 decision: SPAR_Internal/Contaminated_Sites_Plus requires auth (HTTP 200 + error 499 "Token Required") — DROPPED. Public layer is the floor. upstream quirks: AK borough names sometimes truncated upstream ("Skagway Yakutat Ango", "Prince Wales Ketchik"). Status only 4 values (Cleanup Complete 4596, Active 2469, Cleanup Complete-IC 1275, Informational 462). LUST_Site is Yes/No string — 2,631 of 8,802 are LUST sites. Native CRS 3338.

Alaska Oil and Gas Conservation Commission well registry. North Slope (Arctic Slope ~8.1K wells) + Cook Inlet Basin (~1.75K) operator side — Hilcorp, ConocoPhillips, BP/ARCO heavy. - searchWells (~10.3K) ⭐ filter area (basin)/operator/status/wellClass/field/offshoreOnly. Pass bottomHole=true for bottom-hole locations. - searchBottomHoles ⭐ alias for the paired Well_Bottom_Hole_Location service - getWellByApi, listLayers, getServiceInfo upstream quirks: AK is borough-based (no county column) — use area for basin scoping. Native CRS EPSG:3338; service reprojects to 4326. CurrentStatus has 30+ descriptive values (Plugged & Abandoned 3.8K, Oil well single 3.4K, Water alt gas injection 976). maxRecordCount=2000.

Alaska Division of Geological & Geophysical Surveys — state geological survey. Mineral occurrences, geologic-map publication index, mining districts, volcanoes, radon observations. - searchMineralOccurrences ⭐ ~335 — DDS-18 MIL1, filter commodity / group / deposit type / status - searchGeologicMaps ⭐ ~4.16K USGS+DGGS publication index, filter agency / scale / keyword - searchMineralDistricts ⭐ 75 polygons across 14 regions - searchVolcanoes (~53 AVO inventory), getServiceInfo §0 spec drift: geology/statemap_projects + geophysics/Geophysical_Surveys services 500 ("No Layer or Table"). DROPPED. Volcanoes service rejects outFields=* with gateway error — handler enumerates explicit fields. Native CRS varies; outSR=4326 on every call.

Alaska DNR state trust lands + mineral permits/leases + state mining claims + land-status overlays — Land Records System via ArcGIS REST. - searchOilGasLeases ⭐ ~1.7K active O&G + offshore leases (1.95K MineralPermitOrLease) - searchOilGasLeaseSaleTracts ⭐ ~6.3K active sale-tract polygons - searchMiningClaims ⭐ active 38.4K / pending 191 / closed 79.5K - searchLandStatus 4 curated layers: lease 5.2K / mineralOrder 4.5K / miningClaims 120K / stateLand 27K - getLeaseById, listLayers, getServiceInfo §0 spec drift: dog.dnr.alaska.gov returns HTTP 500 on every query — public surface is arcgis.dnr.alaska.gov. AK has NO borough column on these layers — use bbox/near.