Published September 24, 2026
Research question
What records should a mobile home community maintain when repairing water, sewer, drainage, electrical, communications, or other buried systems requires an excavation or trench?
Bottom line
OSHA's excavation standard requires planning for underground installations, surface encumbrances, access and egress, traffic, falling loads, hazardous atmospheres, water, adjacent structures, inspections, and cave-in protection. A competent person must inspect excavations, adjacent areas, and protective systems daily before work and as needed, including after rainstorms or other hazard-increasing events. Employees exposed to cave-in hazards need an adequate protective system unless a stated exception applies.
The evidence file should connect the work request to utility locating, site assessment, competent-person authority, soil and protective-system decision, engineering data where used, daily and event-driven inspections, safe access, spoil and equipment placement, water and atmosphere controls, traffic protection, worker briefing, changes, and backfill closeout. A locate-ticket number or contractor invoice alone does not prove the excavation remained safe.
Method and limits
This review examined OSHA's Subpart P excavation rules, definitions, protective-system appendices, excavation overview, and trenching safety publication on September 23, 2026. Regulatory statements are attributed to OSHA. Proposed administrative fields and quality tests are MobileHomeBiz analysis.
Actual requirements depend on depth, soil, geometry, utilities, structures, atmosphere, equipment, state-plan rules, and professional-engineering decisions. This article does not classify soil, design a protective system, locate a utility, or determine that entry is safe.
Intake and dig authorization
Record property, exact area, reason for excavation, asset involved, planned dimensions, equipment, contractor or employees, proposed dates, emergency status, resident and traffic effects, nearby structures, overhead lines, and person requesting the work. Attach approved maps and photographs with sensitive details access-controlled.
Create a gate that prevents excavation until required locate and owner-clearance steps are complete or the documented emergency procedure applies. Record one-call ticket, request time, ticket scope, member responses, markings, expiration or tolerance-zone rules, private-utility locating, discrepancies, and field verification. One-call systems may not identify privately owned community lines, so the site owner must document that boundary.
Competent-person designation
OSHA defines a competent person as someone capable of identifying existing and predictable hazards and authorized to take prompt corrective measures. Preserve employer designation, training, experience, equipment and soil scope, date, limitations, authority to stop work, and backup coverage. The designation must reflect real capability and authority, not a job-title checkbox.
The daily record should identify the competent person actually responsible for that shift. If responsibility transfers, record the handoff and a new inspection as required by the approved procedure. Remote administrative review cannot replace presence and field judgment.
Site and soil evidence
Before entry, document surface encumbrances, prior excavations and fill, utilities, traffic, vibration, surcharge loads, water, weather, adjacent footings, retaining structures, poles, pavements, and hazardous-atmosphere potential. Preserve the competent person's soil classification and supporting visual and manual tests when the protective-system design depends on soil type.
Conditions can change rapidly. Spoil, rain, leaking utility lines, equipment movement, or previously disturbed material can invalidate the initial picture. Keep the original assessment and add dated reassessments rather than silently replacing the first classification.
Protective-system decision
For each entered excavation, record depth and geometry, cave-in exposure, selected sloping, benching, shoring, or shielding system, applicable OSHA appendix or tabulated data, manufacturer information, registered professional engineer design where required, installation checks, deviations, and approver. Store the supporting data at the jobsite as required and retain it with closeout.
OSHA generally requires protection unless the excavation is entirely in stable rock or is less than five feet deep and a competent person finds no indication of a potential cave-in. The less-than-five-foot condition is not an automatic exemption. Preserve the competent person's finding and current conditions. Never use an older project's soil classification to authorize a new excavation.
Access, egress, spoil, and falling loads
Trenches four feet or more deep require a stairway, ladder, ramp, or other safe means of egress so employees need not travel more than 25 feet laterally. Record access type, location, extension and securement as applicable, inspection, and changes as work advances. Employee-built structural ramps have specific competent-person design requirements; vehicle ramps may require a professional engineer.
Keep spoil piles, materials, and equipment at least two feet from the edge or use retaining devices sufficient to prevent material from falling or rolling into the excavation. Record measurements, barriers, equipment setback, lifting zones, and overhead-load controls. Employees must not work beneath loads handled by lifting or digging equipment.
Water, stability, and adjacent structures
Employees generally may not work in excavations with accumulated or accumulating water unless adequate precautions are used. Preserve pump or drainage method, competent-person monitoring, backup, discharge location, erosion control, alarm or evacuation trigger, and inspection after changes. A running pump is not proof that conditions are controlled.
Document review of sidewalks, pavements, foundations, walls, poles, and other adjacent structures. Where stability is endangered, record shoring, bracing, underpinning, or engineer-approved controls. Watch for undermining during work and backfill. Route cracks, movement, or unexpected voids as immediate stop-work events.