Know your data sources.

Colorado CDPHE — Front-Range air quality, hazardous waste, voluntary cleanup, Superfund. - searchAirQualitySites ⭐ ~15.7K APCD facilities + ~359 CCND monitors merged - searchVoluntaryCleanup ⭐ ~1.7K VCUP + NAD applications. AppStatus: APPROVAL (1465) / WITHDRAWN / DENIAL / PENDING - searchHazardousWasteFacilities ~6.1K RCRA handlers (Generator_Status: VSG/SQG/N/LQG) - searchSuperfundSites ~31 NPL sites, getServiceInfo upstream quirks: Multi-server (AGOL + cohealthmaps.dphe.state.co.us). maps.dphe.state.co.us native UNREACHABLE externally. Air facility schema lean (5 fields, NO County). VCUP fields abbreviated (CityNam, RV_Nmbr). RCRA County UPPERCASE, maxRecordCount=1000.

Colorado ECMC (formerly COGCC). DJ Basin / Wattenberg / Piceance. Two sources: OFFICIAL MONTHLY PRODUCTION (ECMC production report files, loaded monthly, latest accepted revision; dataset_freshness gives the data month + incomplete months): - searchMonthlyProduction ⭐ well oil/gas/water by operator, api, county, formation, months - getOperatorProductionSummary ⭐ wells + volumes per operator per month COGCC_VIEW ARCGIS COPY, FROZEN 2021-09-22 (later wells, permits, status changes missing): - searchWells (~120K) ⭐, searchPermits ⭐ (NOTICE+PLANNED), getWellByApi, searchPits (~13.7K), searchDirectionalBottomHoles (~38.1K), getServiceInfo upstream quirks: wells have NO County text column, only API_County FIPS (123=Weld). Facil_Stat codes PR/PA/AC. No spills/setbacks services.

Colorado State Land Board — ~3M acres state trust lands. Lease + surface ownership + upcoming disposals. - searchOilGasLeases ⭐ Lease_Type='Oil and Gas' filter on ~4.5K leases (991 O&G) - searchUpcomingDisposals ⭐ TRXN-based auction tracts (sparse — 1-5 active) - searchSurfaceOwnership (~6.3K), getLeaseDetail, getServiceInfo upstream quirks: SLB GIS published by martinwi (same org as COGCC_VIEW). Spec said SLB_Leases_ALL_Public — that's the item title, NOT the URL path. Actual: Leases_ALL_2021/FeatureServer/0. Lease_Status: Active (4541), Out for Signature (13). Beneficiary dominated by School (4196). Lease_Subtype has 70+ values + data leaks. CSLB disposals layer 2 only (0/1 return 400).