10.3 Nevada One Call / USA North 811 & Underground Utility Damage Prevention

Nevada Underground Utility Damage Prevention Law (NRS Chapter 455 & NAC Chapter 455)

Striking an underground utility line during excavation poses immediate catastrophic risks to worker life, public safety, and critical municipal infrastructure. Severing a natural gas transmission main can level entire city blocks; puncturing a high-voltage electrical feeder causes fatal arc flashes; and cutting fiber-optic communication conduits can sever emergency 911 dispatch lines.

In Nevada, underground utility damage prevention is governed by NRS 455.080 to 455.180 and the Public Utilities Commission of Nevada (PUCN) regulations in NAC Chapter 455. The PUCN decides civil penalty cases.

The "Call Before You Dig" Statutory Mandate

Under NRS 455.110, a person may not begin an excavation or demolition in an area known, or that reasonably should be known, to contain a subsurface installation (other than its own) without first notifying the association for operators. The designated regional notification center for northern and southern Nevada is USA North 811 (Nevada One Call). This statutory mandate applies universally to:

• General building and engineering contractors
• Plumbing, electrical, and pipeline subcontractors
• Landscaping, fencing, and pool contractors
• Grading, boring, augering, ditching, and demolition operators

                          Nevada 811 Damage Prevention Workflow

   [1. Pre-Mark Dig Area]   ──► Excavator delineates boundary in WHITE paint/flags
              │
   [2. Call USA North 811]  ──► At least 2 working days, no more than 28 calendar days ahead
              │
   [3. Locator Markings]    ──► Utilities mark lines per APWA Uniform Color Code
              │
   [4. Positive Response]   ──► Excavator verifies all utilities have responded/cleared
              │
   [5. 24" Tolerance Zone]  ──► Hand-dig / Pothole ONLY until utility visually exposed
              │
   [6. Controlled Work]     ──► Mechanical equipment used with spotter once line located

White-Lining Pre-Marking (NRS 455.110 and NAC 455.115)

The excavator must make a reasonable effort to mark the proposed excavation area with white paint, flags, stakes, whiskers or another method agreed with the operator (NRS 455.110(1)(b)). Under NAC 455.115, the excavator marks the area before submitting the notification, and marks only the area that can reasonably be excavated within 14 calendar days after the notification. This is called "white-lining." White-lining eliminates ambiguity, ensuring utility locating technicians accurately identify and mark the exact path of the contractor's intended trenching or boring alignment without needlessly surveying unaffected acreage.

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Advance Notification Timelines, Ticket Life & Renewal Procedures

NRS Chapter 455 establishes precise, non-negotiable statutory timelines governing advance notification, ticket validity, and project continuation.

The Advance Notice Window

Under NRS 455.110(1)(a), the excavator notifies the association, in writing or by phone:

• Minimum: At least 2 working days before the excavation or demolition is scheduled to begin.
  • Working Day: Under NRS 455.105, a working day is 7 a.m. to 5 p.m. on every day except Saturday, Sunday and any federal or state holiday. A call at 8:00 a.m. Thursday uses the rest of Thursday and Friday, so digging may start at 8:00 a.m. Monday if no holiday intervenes.
• Maximum: Not more than 28 calendar days before the scheduled start.
• Contents: The responsible person's name, address and phone number; the start date; the anticipated duration and type of work; the specific area; and whether explosives will be used.
• Emergencies: Emergency excavation may proceed without advance notice if loss of life, health or property is substantially likely before compliance is possible. The operator must be notified as soon as practicable (NRS 455.110(2)).

Ticket Validity: 28 Calendar Days (NAC 455.165)

• Validity: A notification is valid for excavation for 28 calendar days after the date and time it was given.
• Extensions: The excavator may request an extension of 28 more calendar days, up to two extensions. After that, it must submit a new notification.
• Operator Response: Each operator must locate and mark its facilities, or report that none are affected, within 2 working days or a mutually agreed time (NRS 455.130).
• Lost or Doubtful Marks (NAC 455.135): The excavator must maintain the marks until the work is done. If marks are removed, covered or disturbed, or their accuracy is in doubt, the excavator must stop work in that area, re-mark it in white, and submit a new notification asking operators to mark or confirm. Operators respond within 2 working days.

Positive Response Verification

Before breaking ground, the excavator must verify that all underground facility owners have responded through USA North 811's electronic Positive Response System. Operators respond with specific status codes indicating:

1. Marked: Facilities are present and marked on the ground per APWA color codes.
2. Clear / No Conflict: The operator has no subsurface installations within the delineated white-lined boundary.
3. Delay: Facility owner requires additional time due to complex site conditions (excavator must wait until clearance is confirmed).

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APWA Uniform Color Code Standards for Subsurface Markings

NRS 455.133 requires operators to use the PUCN's identifying criteria and colors, which must follow nationally accepted standards. In practice this is the American Public Works Association (APWA) Uniform Color Code. Field markings are executed using surface spray paint, surveyor whiskers, plastic staking ribbons, or pin flags:

                             APWA Uniform Color Code Matrix

      [RED]      ──► Electric Power Lines, Conduit, High-Voltage Infrastructure
      [YELLOW]   ──► Gas, Oil, Petroleum, Steam, Flammable Materials
      [ORANGE]   ──► Communications, Fiber-Optics, Cable TV, Alarm Lines
      [BLUE]     ──► Potable Drinking Water
      [GREEN]    ──► Sanitary Sewers, Storm Sewers, Gravity Drains
      [PURPLE]   ──► Reclaimed Water, Irrigation, Non-Potable Slurry Lines
      [PINK]     ──► Temporary Survey Markings & Alignment Layout
      [WHITE]    ──► Proposed Excavation Limits (Contractor Pre-Marking)

Exam Trap: Marks sprayed on the pavement or soil represent the approximate horizontal location of the facility, but they never indicate burial depth. Changes in surface grade, soil erosion, backfill settling, or subsequent landscaping over decades mean a gas main or electrical conduit could be located just 12 inches below the surface or deeper than 6 feet. Never assume depth based on surface markings!

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The 24-Inch Approximate Location & Potholing (NRS 455.082 & 455.137)

One of the most heavily tested legal concepts on the Nevada General Contractor examination is the Tolerance Zone (statutorily defined in Nevada as the "Approximate Location").

Statutory Definition (NRS 455.082)

"Approximate location of a subsurface installation means a strip of land not more than 24 inches on either side of the exterior surface of a subsurface installation. The term does not include the depth of the subsurface installation."

This means the legal boundary of the Tolerance Zone is the actual physical width of the subsurface utility plus 24 inches on the left side and 24 inches on the right side.

                               The Nevada 24-Inch Tolerance Zone

   ◄──────────────────────── Total Protected Zone Width ────────────────────────►
   ┌──────────────────────┬──────────────────────┬──────────────────────┐
   │  24" Left Clearance  │  Utility Pipe/Duct   │ 24" Right Clearance  │
   │   (TOLERANCE ZONE)   │    Outside Diameter  │   (TOLERANCE ZONE)   │
   │                      │        Width (W)     │                      │
   │   HAND-DIG / VAC     │                      │   HAND-DIG / VAC     │
   │   EXCAVATION ONLY    │                      │   EXCAVATION ONLY    │
   └──────────────────────┴──────────────────────┴──────────────────────┘
   ◄──────── 24" ────────►◄───────── W ─────────►◄──────── 24" ────────►
                                    ▲
                         Marked Line Centerline

Calculation Example: If a natural gas transmission line is marked on the ground and has an outside pipe diameter of 12 inches (1 foot), what is the total width of the statutory tolerance zone? $\text{Total Width} = 24\text{ inches (left)} + 12\text{ inches (pipe)} + 24\text{ inches (right)} = 60\text{ inches (5.0 feet)}$ Within this entire 5-foot swath, mechanical digging is strictly prohibited by law until the pipe is exposed!

Locating Before Using Machines (NRS 455.137)

Before using any mechanical equipment, the person responsible must determine the exact location of each affected subsurface installation. It does so by excavating with non-mechanical equipment, or another method agreed with the operator, within the marked approximate location.

• Pavement: Mechanical equipment may be used to remove pavement if no installations are contained in the pavement.
• Cannot Find It: If the facility cannot be found with non-mechanical methods, the excavator asks the operator for more information, and the operator must provide what it has within 1 working day.

Mandatory Potholing Verification Methods

To locate and expose the utility safely within the 24-inch tolerance zone without puncturing it, contractors must utilize non-destructive excavation techniques, universally referred to as potholing:

1. Hand Digging: Using hand tools such as blunt, rounded shovels. Avoid picks, mattocks, pry bars and sharp spud bars, which can pierce plastic gas pipe or crack conduit.
2. Vacuum Excavation (Soft Digging): Utilizing high-pressure water (hydro-vacuum excavation) or compressed air (air-lance vacuum excavation) to break up the soil, which is then immediately extracted into a vacuum debris tank. Vacuum excavation is the industry gold standard because it safely exposes pipes without physical metal impact.
3. Mechanical Excavation Once Exposed: Only after the underground installation has been visually uncovered, positively identified, and verified in three dimensions may mechanical equipment be used in proximity to the facility—and even then, only under continuous guidance from an assigned ground spotter.

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Utility Strike Emergency Protocols, Prohibitions & Civil Penalties

Despite proper planning, utility strikes occur due to inaccurate legacy records, rogue lines, or equipment operator error. When an underground line is nicked, gouged, dented, or severed, strict statutory emergency protocols govern the response.

Strike Response: Statutory Duties and Recommended Steps

NRS 455.140 requires anyone whose excavation contacts, exposes or damages a subsurface installation to notify the operator and allow time for repairs before finishing work in that area. If the damage lets water, flammable, toxic or corrosive gas or liquid, or electricity escape, the excavator must notify the operator and minimize the hazard until the operator's crew arrives. Industry emergency guidance turns those duties into these steps:

[1. Cease Excavation]     ──► Immediately shut off all equipment engines (kill ignition)
           │
[2. Evacuate Area]        ──► Remove all workers & public upwind to a safe perimeter
           │
[3. Call 911]             ──► Immediate 911 notification if hazardous gas/liquid or power cut
           │
[4. Notify Utility Co.]   ──► Direct contact to facility owner/operator emergency dispatch
           │
[5. Report to 811]        ──► File official damage notification ticket with USA North 811

1. Cease Excavation Immediately: The machine operator must instantly stop digging and shut down the equipment engine. Equipment combustion engines, hot exhaust manifolds, and starter switches are potent ignition sources that will detonate leaking natural gas or volatile hydrocarbons.
2. Evacuate the Area: Immediately evacuate all personnel and surrounding members of the public to a safe distance upwind and uphill of the rupture site. Establish a perimeter and prevent any vehicles or individuals with open flames or cell phones from entering the hazard zone.
3. Call 911 Immediately: If the incident involves a release of flammable, toxic, or hazardous gas/liquids (such as natural gas, propane, or petroleum), or if high-voltage electrical lines are severed, the contractor must dial 911 immediately to summon fire department hazardous materials (HazMat) teams and law enforcement.
4. Notify the Utility Operator Directly: The contractor must contact the affected utility company's emergency dispatch center immediately, providing the exact street location, cross streets, pipeline size, and nature of damage.
5. Notify USA North 811: Log an official damage report through the One Call center to maintain an auditable public safety paper trail.

Strict Statutory Prohibition on Field Repairs & Crimping

One of the most dangerous and strictly prohibited actions on a construction site is for an excavator to attempt an amateur field repair on a damaged gas line:

CRITICAL SAFETY POINT — DO NOT CRIMP OR EXTINGUISH GAS LINES (utility and fire-service guidance):

• Do NOT attempt to crimp, bend, tape, or plug a damaged gas pipe. Escaping natural gas rushing through plastic polyethylene (PE) pipe creates intense static electrical friction on the pipe walls. Attempting to squeeze, bend, or crimp the pipe can generate a static electricity arc that instantly ignites the escaping gas, engulfing the worker in a fatal fireball.
• Do NOT attempt to extinguish a burning gas line fire. If a punctured gas line ignites, do not put out the fire with chemical extinguishers or dirt. Extinguishing the flame without shutting off the gas supply allows invisible, highly explosive gas to pool in surrounding trenches, basements, and sewer lines, creating a catastrophic vapor cloud explosion hazard upon encountering a secondary ignition source. Let the gas burn in a controlled jet until utility technicians isolate the main valve!

Civil Penalties (NRS 455.170)

The Attorney General, a district attorney, PUCN staff, the permitting agency, an operator or an excavator may bring a penalty action before the PUCN:

• Willful or Repeated Violations: Up to $2,500 per day for each violation, and up to $250,000 for any related series of violations within a calendar year.
• Negligent Violations: Up to $1,000 per day for each violation, and up to $50,000 for a related series within a calendar year.
• High-Consequence Lines: The maximums may be tripled for a violation that involves contact with, or occurs less than 24 horizontal inches from, a high-consequence subsurface installation.
• Factors: The PUCN weighs gravity, good faith, prior violations, willfulness or negligence, timely self-reporting, cooperation, and whether service was interrupted.
• Other Remedies: Ordinary civil claims for damage remain available (NRS 455.180), and willful disregard of state safety laws is a ground for NSCB discipline (NRS 624.3011(1)(b)(2)).