Everything contractors, engineers, and project managers need to know about utility potholing, soft dig excavation, 811, APWA color codes, SUE quality levels, and private utility locating in South Florida.
Utility potholing — also called daylighting — is the process of excavating a precise, controlled test hole using vacuum excavation (soft dig) to physically expose an underground utility. Once exposed, technicians measure and document the utility's exact depth, outside diameter, material, and condition.
Potholing is the only field method that provides Quality Level A (QL-A) utility data per ASCE 38-02 — the highest accuracy standard in Subsurface Utility Engineering. It is required on projects where utility depth must be verified before construction activities cross or run parallel to existing infrastructure.
In construction, potholing refers to excavating small test holes — typically 12"×12" to 24"×24" at the surface — at known or suspected utility locations before major construction activities begin. Construction potholing is used to verify utility depth at crossings, confirm clearances before drilling or boring, and identify utility conflicts that could cause project delays or safety hazards.
On South Florida construction projects, potholing is commonly specified at utility crossings for new pipelines, at directional bore entry and exit pits, at deep foundation locations near utilities, and at any point where design drawings show potential conflicts with existing utilities.
Soft dig is a non-destructive excavation method that uses compressed air (air excavation) or high-pressure water (hydrovac) to break up soil around buried utilities, then vacuums the loosened material away. This exposes utilities without mechanical contact — eliminating the risk of damage from conventional excavation equipment. Unlike traditional excavation methods that use mechanical equipment, vacuum excavation and hydro excavation expose the utilities without risk of accidental contact. High pressure water or compressed air breaks up soil, then a power vacuum removes it — making these potholing methods ideal for any construction project near buried utility lines.
We operate both vac trucks (for larger excavations) and portable barrel/air compressor units (for confined or access-restricted sites). Soft dig vacuum excavation is the method we use for all utility potholing in South Florida. See our vacuum excavation page for details on both methods.
811 (Sunshine State One Call) is Florida's mandatory notification system. Before you excavate, you call 811 and public utilities — electric, gas, water, sewer, telecom — send crews to mark their lines near your dig site. This is required by Florida law.
What 811 does not do: it does not cover privately owned utilities. Irrigation systems, site lighting, on-site electrical runs, private telecom, fire suppression, privately-maintained fiber, and similar utilities are not in the 811 system. These lines exist on virtually every commercial, industrial, and institutional property in South Florida — and they are your contractor's liability if struck.
Private utility locating uses electromagnetic (EM) and GPR technology to find everything 811 misses. It is not a replacement for calling 811 — it is a critical addition to 811 that provides complete protection.
The American Public Works Association (APWA) color code system is the national standard for marking underground utilities. All utility marks — whether from 811 or private locators — use these colors:
| Color | Utility Type |
|---|---|
| Red | Electric power lines, cables, conduit, and lighting cables |
| Yellow | Gas, oil, steam, petroleum, and gaseous materials |
| Orange | Telecommunications, cable TV, alarm, and signal lines |
| Blue | Potable water |
| Green | Sewers and drain lines |
| Purple | Reclaimed water, irrigation, and slurry lines |
| Pink | Temporary survey markings |
| White | Proposed excavation limits or route |
These colors apply to paint marks, flags, and stakes placed by 811 utilities and private locators. Understanding these codes helps your crew and project managers immediately identify what utilities have been located and marked on-site.
ASCE 38-02 defines four Quality Levels (QL) for subsurface utility data. Each level specifies the method used and the resulting accuracy and confidence:
Most South Florida projects require QL-B for the full corridor and QL-A at identified conflict points. See our utility mapping page for full SUE service details.
Subsurface Utility Engineering (SUE) is an engineering discipline that manages the risks associated with existing subsurface utilities during design and construction of new facilities. A SUE program systematically identifies, locates, and documents underground utilities using a defined quality level framework (ASCE 38-02) and delivers that information to engineering teams in a usable format — typically as a CAD layer integrated into project drawings.
SUE programs are required or recommended on most FDOT and county transportation projects in Florida, and are increasingly specified by private project owners and engineering firms across South Florida as a standard due-diligence measure.
Private utility locating costs vary based on site size, utility density, number of utility types present, and whether GPR is required in addition to EM locating. Most standard commercial or industrial locating projects in Broward, Miami-Dade, or Palm Beach County are priced as a flat project fee or per-acre rate.
We provide free quotes for every project. Contact us at (954) 849-2859 or submit a quote request with your project details for a specific price. We respond within 2 hours.
Potholing cost depends on number of test holes, excavation depth, soil conditions, surface type (pavement vs. unpaved), and site access. Most South Florida potholing projects are priced per test hole with a mobilization fee, or as a daily rate for larger programs.
Call us at (954) 849-2859 or request a quote with your hole count, depths, and project location for a fast price. We typically turn quotes around the same day.
We recommend scheduling at least 48–72 hours before your excavation date. For most South Florida projects in Broward, Miami-Dade, and Palm Beach County, we can mobilize within 24 hours of authorization. Emergency same-day response is available for urgent situations — call us directly at (954) 849-2859.
Yes — calling 811 is required by Florida law before any excavation, regardless of whether you also hire a private locator. Private utility locating supplements 811 by finding privately owned utilities that 811 does not cover. The two services work together, not as alternatives. We coordinate our field work alongside your 811 marks to ensure complete coverage of all utility types on your project site.
Utility potholing uses specialized equipment designed for non-destructive excavation. The two primary types are:
Both types of specialized equipment achieve the same goal — exposing utility lines without mechanical contact — while matching the equipment to site conditions.
Both hydro excavation and air excavation are vacuum excavation methods used for potholing. The difference is how soil is broken up before vacuuming:
We match the potholing method to your project conditions, utility type, and site access requirements.
A typical utility pothole in South Florida takes 30–90 minutes per test hole, depending on depth, soil conditions, surface type, and whether pavement cutting is required. Most construction projects require potholing at a handful of critical conflict points — a standard 5–10 hole potholing program can usually be completed in a single day mobilization.
Large-scale SUE Quality Level A programs with dozens of test holes across a corridor are scheduled as multi-day programs. We provide estimated hole counts and durations in every quote so your project team can plan accordingly.
Potholing for utilities is typically required or strongly recommended in these situations:
Our team answers questions from South Florida engineers and contractors every day. No sales pitch — straight answers.