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Plan underground utility work as a controlled sequence: define the work area, request and verify utility-owner responses, expose facilities safely as excavation approaches, and prepare excavation controls before anyone breaks ground. A submitted 811 ticket is coordination—not permission to dig. Under U.S. OSHA construction rules, estimated utility locations must be determined before an excavation is opened, and owners must be contacted within the established or customary local response time.
Use the process below for U.S. projects, then confirm the one-call deadlines, ticket rules, permits, tolerance-zone dimensions, and marking requirements in the project’s state and municipality. Oklahoma examples are identified separately because they are not nationwide rules.
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What a complete underground-utility plan must accomplish
Your pre-construction plan should leave the crew with a documented answer to five questions:
- Where exactly is the proposed work, and what equipment and methods will enter it?
- Which utility owners may be affected, and has each one responded?
- How will the crew verify the precise position, depth, and path of a facility as excavation gets close?
- How will exposed pipes, conduits, ducts, and cables be protected while the excavation is open?
- What controls address cave-ins, traffic, nearby structures, water, atmospheres, access, inspections, and emergencies?
OSHA’s construction rule at 29 CFR 1926.651 requires estimated locations to be determined before opening an excavation. Utility owners must be contacted, advised of the proposed work, and asked to establish the location of their installations before actual excavation begins. The rule also requires the exact location to be determined by safe and acceptable means when excavation approaches the estimated location, with exposed installations protected, supported, or removed as necessary.
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OSHA’s Construction eTool states: “Pre-job planning is vital to incident-free excavation work; safety cannot be compromised as work progresses.” CDC/NIOSH expresses the same priority more briefly: “Before you dig it, plan it!”
Step 1: Define the scope and work limits
Locators and utility owners can respond accurately only when the planned work is described accurately. Assemble a written scope before requesting a ticket.
Record the site and physical limits
- Street address, nearest cross street, parcel or lot identification, and a site contact who can meet utility representatives.
- Beginning and ending points, stationing, easements, rights-of-way, and the full area that equipment, spoil, access routes, and temporary facilities may occupy.
- Planned excavation width, depth, length, shafts, pits, bore paths, tie-in points, and locations where the route changes.
- Potentially affected adjoining parcels or public areas, not just the footprint of the trench.
Describe the work and method
State what will be installed, repaired, removed, or tested; the intended start date and duration; and the excavation method. Include trenching, potholing, grading, demolition, pile work, drilling, boring, road crossing, dewatering, and any work that may disturb the ground even if it is not called an excavation.
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Pre-mark the proposed excavation area
White temporary paint or flags can communicate the precise proposed dig area to locators. This is an optional planning aid, not a utility mark. White marks do not identify buried services and never replace the one-call process. Keep them visible, refresh them when they fade, and distinguish them from the colors used for facility markings under the applicable local system.
Prepare a scope package
Give the competent person and the person requesting the ticket the same current drawing or sketch. Show the work limits, proposed elevations, access points, traffic controls, equipment routes, and known surface indicators such as valve boxes, manholes, poles, meters, and cabinets. Flag changes in alignment or depth so a revised locate can be requested if the design moves.
Step 2: Request locates and coordinate with utility owners
Contact the applicable U.S. 811 one-call center within the lead time required by the project’s jurisdiction. The one-call request should cover every area that could be disturbed, including staging and access areas where ground penetration or loading may occur.
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- Worksite location and a description that a locator can find without guesswork.
- Type and extent of the proposed work.
- Excavation method and equipment, including boring or drilling.
- Work-area dimensions, route, limits, and planned start date.
- Excavator name, callback number, on-site contact, and any special access instructions.
Coordinate directly with facility operators when the plans, records, permit conditions, or the one-call center identify an owner that needs additional information or a field meeting. OSHA requires owners to be contacted within established or customary local response times, advised of the proposed work, and asked to establish installation locations before excavation.
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Do not generalize one-call deadlines
Deadlines, ticket-validity periods, renewal rules, emergency exceptions, pre-marking requirements, and tolerance-zone procedures are jurisdiction-specific. Oklahoma’s Safe Digging Guide, for example, states a minimum of three business days’ notice for planned excavation under Oklahoma law. That is an Oklahoma example, not a national deadline. Confirm the actual state and local rule before scheduling crews or equipment.
Plan for special owners and records
One-call systems may not include every privately owned or unusual facility. Check project records and ask the owner, property manager, engineer, or permitting authority about private lines, customer-owned services, irrigation, lighting, communications, fuel systems, abandoned facilities, and utility corridors on private property. Obtain available as-built drawings and survey information, but treat records as evidence to be verified rather than as proof of exact location.
Step 3: Track and verify every response
Assign one person to maintain the ticket log. The log should show the ticket number, request date and time, planned start, affected operators, response status, mark date, field contact, and follow-up required. Keep the ticket, sketches, photographs, emails, and operator notes with the daily work package.
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Check positive response before excavation
A submitted ticket is not clearance to dig. Before ground disturbance, confirm that each listed operator has responded and determine whether it:
- Marked facilities in the proposed work area.
- Needs to meet the excavator or provide additional information.
- Reported no facilities in the proposed area.
- Could not complete a locate because access, weather, construction, or another condition prevented it.
Use the equivalent positive-response process required in the project’s jurisdiction. Resolve an unmarked or incomplete response before excavation rather than assuming that silence means no conflict. If the work area, depth, route, or start date changes beyond the ticket’s scope or validity, stop and obtain the required update or retransmission.
Walk the site with the plan
Compare marks with the drawings and surface evidence. Look for a mark that stops short of the planned excavation, a line that changes direction, multiple facilities in one corridor, or a service entering a building or crossing the work. Photograph the marked area and record any discrepancy for the utility owner and project engineer.
Hold a pre-excavation briefing
Before each crew starts, review the ticket, mark colors, limits, planned exposure points, equipment restrictions, spotter assignments, stop-work signal, access and egress, traffic controls, and emergency contacts. Include subcontractors and delivery drivers whose movements could disturb the ground.
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Utility marks and records are estimates of a facility’s horizontal and vertical position. As excavation approaches an estimated location, the crew must determine the exact location by safe and acceptable means under OSHA’s excavation requirements.
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Choose an exposure method for the actual conflict
The competent person, utility owner, and project team should select a method that matches the facility, soil, depth, weather, equipment, and local rules. Possible approaches include careful hand excavation, vacuum excavation, test holes, or a utility-owner-directed method. The plan should state who performs the exposure, how the facility will be identified, how spoil and water will be managed, and what distance or equipment restrictions apply while the facility is being approached.
Oklahoma’s guide advises careful hand digging near its stated tolerance zone and says crews must expose lines before crossing or working close with power equipment. Its tolerance-zone definition is Oklahoma guidance; do not apply its dimension to another state without checking that jurisdiction’s rule.
Expose before crossing or working close with powered equipment
Do not rely on a paint line while an excavator, trencher, auger, or drill is about to cross the estimated route. Expose the facility sufficiently to establish its path and depth, then reassess the method and clearance. A spotter should have a clear view of the excavation and equipment, with a defined authority to stop the operator.
Identify what has been exposed
Confirm the facility’s owner and type before proceeding. A duct bank, communications conduit, gas service, water line, electrical cable, or abandoned-looking pipe may require different controls. If the facility cannot be identified or its condition is uncertain, suspend conflicting work and obtain the owner’s direction.
Protect, support, or remove exposed installations
Plan supports before the excavation opens. Exposed pipes, conduits, cables, and ducts can be damaged by their own weight, loss of surrounding soil, equipment contact, vibration, water, or nearby spoil loads. Use a support arrangement approved for the facility and conditions; do not improvise a support that could crush, bend, or abrade it. Coordinate removal, relocation, isolation, or shutdown with the owner, and keep the excavation protected until the installation is safely restored or supported.
Step 5: Design the excavation controls before mobilization
Utility locating is only one part of excavation safety. OSHA and CDC/NIOSH planning guidance calls for a complete work method that addresses the trench, the surrounding site, and changing conditions.
Assess soil and select a protective system
Arrange for a competent person to evaluate soil and site conditions and to select, design, install, and maintain the required protective system. The plan should identify whether the work uses sloping, benching, shoring, or a trench shield, and how the system will be installed, moved, inspected, and removed. Account for surcharge loads from spoil, materials, traffic, adjacent excavations, foundations, and equipment.
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Set safe locations for spoil piles, materials, trucks, and equipment routes. Keep loads away from the edge as required by the protective-system design and applicable rules. Consider vibration from traffic, compaction, drilling, pile work, and demolition, especially near fragile utilities or structures.
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Protect nearby structures
Inspect foundations, walls, pavements, poles, retaining systems, and other structures that could be undermined. Obtain an engineered support or sequence when the excavation could reduce bearing, cause settlement, or destabilize a structure. Include monitoring points or hold points when movement is a credible hazard.
Plan traffic and public protection
Prepare traffic control for vehicles, pedestrians, cyclists, and site workers. Include lane-closure permits where required, barriers, signs, lighting, flaggers, equipment ingress and egress, and a protected route around open excavations. Coordinate the traffic plan with the utility exposure sequence so a required test hole does not unexpectedly occupy a live lane.
Provide access and egress
Place ladders, ramps, stairs, or other compliant access systems so workers do not climb on utilities, braces, or unstable soil. Keep access points clear of spoil, hoses, equipment, and traffic. Reassess access whenever the trench length, depth, support system, or work sequence changes.
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Control water accumulation
Plan drainage, pumping, diversion, and backup arrangements before water enters the excavation. Water can undermine soil, obscure marks and exposed facilities, increase slip hazards, and change the effectiveness of a protective system. Do not allow workers into an excavation with accumulating water unless the required precautions and competent-person evaluation are in place.
Evaluate atmospheric hazards
Consider oxygen deficiency, toxic or flammable gases, releases from damaged utilities, and atmospheres in deep or confined excavations. Specify testing, ventilation, calibration, attendant duties, evacuation criteria, and rescue arrangements where the assessment indicates a possible atmospheric hazard. Never use a worker to investigate an unknown atmosphere without the controls required for that hazard.
Set inspection triggers
The OSHA eTool calls for inspections before construction, daily before each shift, as needed during the shift, and after rainstorms or other events that increase hazards. Assign a competent person to inspect protective systems, soil, edges, access, water, atmospheres when applicable, utility supports, traffic controls, and nearby structures. Record deficiencies, the corrective action, and the authorization to resume work.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Step 6: Choose the least-exposing construction method
Open trenching is not automatically the best method. Compare feasible methods against the actual utility corridor and site constraints before finalizing the plan.
| Decision factor | Questions for the project team |
|---|---|
| Utility conflict exposure | Which method minimizes contact with existing facilities and allows conflicts to be verified? |
| Worker exposure | How much time will workers spend in an excavation or near exposed utilities? |
| Surface disruption | What roads, sidewalks, landscaping, buildings, or operating areas must remain available? |
| Traffic and access | Can the method be performed without unacceptable lane closures or blocked emergency access? |
| Soil and trench hazards | Does the method reduce open-trench length, shoring demand, water exposure, or spoil loading? |
| Permits and constraints | Which method-specific permits, easements, environmental controls, and owner approvals are required? |
CDC/NIOSH identifies directional boring, relining, pipe ramming, and utility tunneling or pipe jacking as alternatives to open trenching. These are options to evaluate, not universal recommendations. A trenchless method can still encounter unknown utilities, require launch and receiving pits, create drilling-fluid or spoil hazards, and demand precise verification of the route.
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Step 7: Build emergency and stop-work procedures
Define immediate actions for a utility strike
Write the response for each credible facility type and make it available to the crew. The procedure should identify who calls emergency services and the utility owner, how the area is isolated, where workers and the public must move, and who can authorize re-entry. Treat a damaged or exposed facility as energized, pressurized, contaminated, or otherwise hazardous until the owner confirms its condition.
Include trench and atmospheric emergencies
The emergency action plan should address cave-in, engulfment, flooding, equipment contact, fire, hazardous atmosphere, collapse of an adjacent structure, and a worker who cannot climb out. Specify alarm or communication methods, access for responders, first-aid resources, rescue limitations, and the prohibition on unplanned entry into a collapsed or unknown atmosphere.
Define stop-work triggers
- A required operator response or mark is missing, unclear, or outside the ticket scope.
- An exposed facility differs from the records or marks.
- Exact location cannot be established safely.
- Utility support, trench protection, access, traffic control, or atmospheric controls are not in place.
- Soil, water, weather, vibration, nearby structures, or traffic conditions change.
- The competent person cannot complete or accept the required inspection.
Make stop-work authority explicit for every worker, then provide a documented process for correction, reinspection, and restart.
Field-ready pre-start checklist
- Scope, drawings, work limits, method, depth, route, access, and start date are current.
- White pre-marking, if used, shows the proposed dig area and is not being mistaken for a utility mark.
- The correct one-call center was contacted within the local deadline.
- Every operator response is recorded as marked, meeting required, or no facility reported.
- Private and owner-specific facilities have been investigated.
- Ticket validity, retransmission, permit, and renewal requirements have been checked.
- Locating and exposure methods are defined for each expected conflict.
- Equipment restrictions, spotters, hand-dig or vacuum points, and hold points are assigned.
- Protective-system design, soil assessment, spoil placement, and inspection responsibility are documented.
- Traffic, pedestrian, access, egress, water, atmospheric, and nearby-structure controls are ready.
- Utility support or removal arrangements are agreed with the owner.
- Emergency contacts, evacuation routes, rescue limitations, and stop-work triggers are briefed.
- The competent person has authority to inspect, correct, and stop the work.
Jurisdiction and guidance boundaries
The legal requirements described above are from U.S. OSHA construction rules, and the 811 planning guidance is U.S.-specific. Confirm the rules where the project is actually located, including state one-call law, municipal permits, utility-owner procedures, excavation permits, marking colors, tolerance-zone dimensions, and ticket response rules.
Oklahoma’s three-business-day notice example, positive-response process, and tolerance-zone advice come from the OKIE811 Safe Digging Guide and apply to Oklahoma. They should not be presented as nationwide requirements.
The UK Health and Safety Executive’s HSG47 organizes safe underground-service work around planning, locating and identifying buried services, and safe excavation. It can be a useful planning framework, but it is UK guidance rather than U.S. law.
What to retain in the project record
Keep the approved scope and drawings, one-call ticket and responses, direct-owner correspondence, field meeting notes, photographs of marks and exposures, utility-owner instructions, soil and protective-system decisions, competent-person inspections, atmospheric tests where applicable, traffic permits, support details, change notices, and restart authorizations. A complete record lets the next shift understand what was located, what remains uncertain, and which controls must be maintained while the excavation is open.
Frequently Asked Questions
Does submitting an 811 ticket mean the crew can start digging?
No. The ticket starts the coordination process. Confirm that every affected operator has responded and that facilities are marked, a required meeting has occurred, or the operator has reported no facility in the work area. Then follow the local rule for exact-location verification and tolerance-zone work.
Are white paint marks the location of underground utilities?
No. White paint or flags can show locators the proposed excavation area. They do not identify buried services and do not replace an 811 request or utility-owner response.
Can Oklahoma’s three-business-day notice or tolerance-zone example be used on another project?
No. Those are Oklahoma-specific examples. Check the one-call deadline, ticket rules, and tolerance-zone procedure in the state and municipality where the work will occur.
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