PART 817 — PERMANENT PROGRAM PERFORMANCE STANDARDS—UNDERGROUND MININGACTIVITIES [ 30 CFR 817 ]PART817 — PERMANENT PROGRAM PERFORMANCE STANDARDS—UNDERGROUND MINING ACTIVITIES [ 30 CFR 817 ]Table of Contents§ 817.1 — Scope.§ 817.2 — Objectives.§ 817.10 — Information collection.[ Last FR update: 12/12/2008 ]§ 817.11 — Signs and markers.[ Last FR update: 12/12/2008 ]§ 817.13 — Casing and sealing of exposedunderground openings: General requirements.[ Last FR update: 09/26/1983 ]§ 817.14 — Casing and sealing of undergroundopenings: Temporary.§ 817.15 — Casing and sealing of undergroundopenings: Permanent.[ Last FRupdate: 09/29/2010 ]§ 817.22 — Topsoil and subsoil.[ Last FR update: 08/30/2006 ]§ 817.41 — Hydrologic-balance protection.[ Last FR update: 03/31/1995 ]§ 817.42 — Hydrologic balance: Water qualitystandards and effluent limitations.[Last FR update: 09/26/1983 ]§ 817.43 — Diversions.[ Last FR update: 12/12/2008 ]§ 817.45 — Hy...