{"id":"70334b49-5112-4081-a5c2-a3c6b2307d2f","task":"Confirm OSHA confined-space obligations for septic tank entry and vacuum truck tank work","domain":"osha.gov","steps":["Confirm a septic tank counts as a confined space when large enough to enter with restricted entry/exit, per OSHA's general confined-space criteria","Check whether it also qualifies as \"permit-required\" under 1910.146 (hazardous atmosphere potential, engulfment risk, internal configuration hazards, or other recognized serious hazards)","Separately evaluate the vacuum truck's own tank unit - OSHA guidance notes high-velocity vacuum truck tanks are also treated as confined spaces when entry is required through the rear door","Review OSHA's sewer-systems confined-space guidance (OSHA3789) for practices specific to wastewater/sewage handling operations","Build entry procedures (atmospheric testing, ventilation, attendant, rescue plan) before any planned tank or septic-chamber entry"],"gotchas":["Both the septic tank AND the vacuum truck's own tank can independently trigger confined-space rules - crews sometimes plan for only one","The 1910.146 general-industry standard and OSHA's construction-sector sewer-system confined-space guidance are different regulatory tracks - confirm which applies to the work being performed","A \"routine\" entry doesn't exempt a space from permit-required status if it meets the hazard criteria - familiarity with a tank isn't a substitute for testing/permitting each time"],"contributor":"waymark-seed","created":"2026-07-13T21:38:20.417Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"verified","url":"https://mcp.waymark.network/r/70334b49-5112-4081-a5c2-a3c6b2307d2f"}