Every summer I get the same call: a crew hit a gas line or fiber run mid-dig, work stops, the utility company is on site, and now there's a damage claim on top of a blown schedule. Almost every time, it traces back to the same gap — the NJ One Call requirements weren't followed to the letter, or someone assumed the markout from six weeks ago was still good. If your crews are opening ground anywhere in New Jersey, the One Call process isn't paperwork you can shortcut. It's state law, and it's also baked into your OSHA excavation obligations.
What the New Jersey One Call Law Actually Requires
New Jersey's Underground Facility Protection Act requires anyone planning to excavate — general contractors, utility contractors, and their subs — to call 811 or 1-800-272-1000 at least three full business days before breaking ground, excluding weekends and holidays. That call opens a ticket with the New Jersey One Call Center, which notifies every registered utility operator with facilities near your dig site. Each operator then has to mark, flag, or paint the location of their underground lines before you're clear to dig.
Two dates matter as much as the call itself. You can't start until the three-business-day window has passed, and once it has, you're required to start excavation within 10 business days of the original call — let that window close and you need a new ticket. Markouts themselves are valid for 45 business days from the date they're placed, not 45 days from your call. On a job that stalls for material delays or weather, track that expiration separately from your original call date.
OSHA's Utility Location Requirement Runs Parallel to This
Contractors sometimes treat One Call as a state utility formality separate from OSHA. It isn't. 29 CFR 1926.651(b) requires the employer to determine the estimated location of underground utility installations before opening an excavation, and to contact the utility companies or owners for markout when the excavation is in the vicinity of those installations. An OSHA compliance officer on an excavation site will ask for proof of your utility markout request as part of verifying your excavation safety requirements — no ticket number, no documentation, and you're looking at a citation even if nothing was struck.
Color Codes and the Two-Foot Tolerance Zone
Once utilities respond, markings follow the standard American Public Works Association color code: red for electric, yellow for gas/oil/steam and other hazardous liquids, orange for communications and CATV, blue for water, green for sewer, and white for the proposed excavation route your crew stakes out before calling. Inside two feet on either side of any marked facility — the tolerance zone — mechanized equipment is off the table. That ground gets hand-dug or hydro-excavated. This is where I see the most citations and the most utility strikes: a machine operator working a trench line who doesn't realize the marked utility crosses their excavation path, not just runs alongside it.
Here's what needs to be in place before your crew breaks ground on any NJ excavation:
- A documented 811/One Call ticket number for every dig, kept in the job file, not just a foreman's phone
- A tracked call date, clearance date, 10-business-day start deadline, and 45-business-day markout expiration for each ticket
- Photos of markout paint/flags before excavation begins, dated and tied to the ticket number
- A written excavation safety plan referencing 1926.651(b) utility location procedures, reviewed by your competent person
- Hand-digging or hydro-excavation procedures for all work inside the two-foot tolerance zone
- A protocol for what happens if a marked utility doesn't match field conditions, or an unmarked line is exposed
New York and Pennsylvania Contractors: Same Idea, Different Systems
If your crews cross state lines, don't assume NJ's timeline transfers. New York excavators use Dig Safely New York (and NYC has its own additional requirements through DOB), while Pennsylvania runs through the PA One Call System under the Underground Utility Line Protection Law. Notice windows and markout validity periods differ by state — build your pre-mobilization checklist around whichever state the job sits in, not the one your office is in.
Utility strikes are one of the more preventable incidents on a jobsite, and they're also one of the fastest ways to turn a routine excavation into a liability and OSHA problem at the same time. Blueprint Safety builds the written excavation programs, ticket-tracking procedures, and competent person documentation that hold up when an inspector or a utility company asks for proof — before the first bucket of dirt comes out.