Locating on multi-utility sites
A first advanced lesson for the team about to scope work on campuses, hospitals, or industrial facilities — anywhere private utilities dominate and 811 coverage stops at the meter. The lessons here assume you have the locating fundamentals from the NULCA practice assessment already in hand.
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Why this lesson exists
Multi-utility sites break the assumptions 811 coverage was built around. The public ticket covers the right-of-way up to the meter; everything site-side of that line — building entries, fire-service laterals, irrigation, communications, low-voltage runs — belongs to the private locator, and the geometry is rarely documented anywhere you can rely on.
- Intermediate-level field technicians moving from right-of-way work to multi- utility footprints.
- Junior project managers and owner-side oversight staff who need to know what to ask a private locator to deliver.
- Designers and engineers about to scope excavation, grading, or utility work on a campus, hospital, or industrial facility.
By the end of the lesson you should be able to do the following without reaching for a checklist.
- 01Recognise the 811 / private demarcation gap on a multi-utility footprint before mobilisation.
- 02Plan a sweep-grid transect pattern that catches laterals running in any direction.
- 03Select complementary geophysical methods by site material and access constraint.
- 04Map field findings to ASCE 38 quality levels and report in the project datum.
- 05Hand off a closeout package the project team can act on without surprises.
The 811 / private demarcation gap
Right-of-way work assumes the public ticket covers everything in the corridor. Multi-utility work explicitly does not — the property line, the meter, and the service stub all introduce a private-side band that 811 does not reach.
On campuses, hospital networks, and industrial parks, the utility footprint behaves like a small city wrapped around bounded buildings: service laterals running in many directions, abandonment seams from decades of capital work, and a facilities team that often holds the only authoritative map.
The risk on these sites is structural, not technique. A right-of-way sweep relies on parallel public laterals; a multi-utility sweep has to assume crossing laterals in every direction, occasional non-metallic runs, and at least one undocumented utility the GIS does not know about. The lesson that follows treats each of those as the default, not the exception.
Typical boundaries: the property line, the meter, the building entry, or the first valve. Anything on the property-side of that point — including fire-service laterals, irrigation, communications, site lighting, and low-voltage runs — is private coverage. The public ticket does not relieve the private locator of responsibility for the private side.
A field-ready sweep pattern
The lesson mirrors the SureTrace engagement phases — pre-field intel, field detection sweep, verification & closeout — so vocabulary on site matches what the firm quotes, and the deliverable matches what the project team expects to receive.
- Pull as-built records, prior locating reports, and any private utility documentation already on file.
- Reconcile the facilities-team GIS against as-builts — segments, lateral taps, and abandoned runs almost always drift.
- Interview site contacts (facilities, prior contractors, security) about known and unknown private assets.
- Pre-screen with magnetometry and ground-penetrating radar where the surface allows; flag high-risk zones for closer sweeps.
- Select equipment by material — multi-frequency EMI sweeps for mixed metallic laterals, GPR for non-metallic runs and unknowns.
- Sweep on a transect grid (1–1.5 m) crossing the suspected corridor, with a perpendicular tie-line every fourth pass.
- Use sondes, vacuum-excavation entry points, and tracer hookups to confirm laterals at every building penetration.
- Hand-dig (or pot-hole) around any utility crossing inside the work zone before excavation machinery arrives.
- Assign each segment a quality level (A–D) based on the method that confirmed it: potholed for A, multi-method confirmation for B, records + one method for C, records only for D.
- Surface-mark with APWA color code and survey to project datum using handheld GPS or RTK where accuracy matters.
- Document depth estimates, signal confidence, and assumptions for every point — including what was NOT found and why.
- Hand off the field report, findings map, and recommendations memo alongside a live closeout briefing with the project team.
A 1–1.5 m transect grid with a perpendicular tie-line every fourth pass closes the sweep against laterals running parallel to the dominant corridor. This is the same geometry a SureTrace engagement quotes on a multi-utility site; pinning it here keeps field and PM on the same page before mobilisation.
Phase 1 — pre-field intelligence — is the SCOPE precondition. Phase 2 — field detection sweep — produces the field markings, findings map, and field report that DELIVERABLES names. Phase 3 — verification & closeout — is the recommendations memo and closeout briefing the framework promises.
Open the engagement frameworkSix mistakes that show up on every multi-utility engagement
The lesson collects the calls we have flagged in post-field debriefs across campuses, hospitals, and industrial facilities. Each one has a clear signal in the field and a corrective move the team can run before closeout.
Mark-out matches the GIS but the field shows abandoned runs, missing stubs, and post-construction additions.
Reconcile the GIS against as-builts and a facilities-team interview before the sweep; flag every segment the GIS labels but the ground does not back.
Strong signal on metallic runs, blank responses on the parallel PVC storm lateral a metre away.
Switch to multi-frequency EMI plus GPR; alternate methods rather than re-driving the same frequency until something shows up.
Open lids everywhere have stuck sediment covering the conduit; the lid magnetometer pass comes back clean.
Sweep every surface asset that can carry a signal — lids, handholes, valve boxes, cleanouts — before the area is closed to traffic.
Strong, uninterrupted signal from the meter to a stub-out; the host pipe shows a repair splice a metre upstream.
Report the conductor as traced (C-quality), pothole before any excavation crosses the line, and never substitute wire continuity for host-pipe confidence.
Project asks for an 811 ticket and waits — meanwhile private fire-service laterals run under the proposed trench.
Confirm the 811 / private boundary at kick-off; private-side coverage belongs to the private locator from the meter or service stub inward.
Field tablet reports a sub-meter coordinate; the project base map snaps it to the wrong segment after overlay.
Deliver in the project datum with the control monuments and published accuracy class on every segment so the consumer never has to infer.
Self-check — four questions, reveal as you go
A short authored self-check covering the framing decisions that show up on day one of an engagement. Reveal an answer to read the rationale; reset between engagements with Hide all.
This is a self-check, not a graded exam. Pick a question, reveal the answer, and use the rationale to decide whether the topic earns another pass before closeout.
0 of 4 answers revealed. State is kept on this device only.
- 01
A campus facilities manager hands you a polished GIS layer with every building, light pole, and known water line. What is your first move before sweeping the field?
- 02
You arrive at an industrial facility. The 811 ticket you pulled shows the public utilities only. Where on the property do you start the sweep and how wide do you set the transect spacing?
- 03
A tracer wire shows continuous signal along what the GIS labels as a 6-inch fire-service lateral. What level of confidence do you report?
- 04
You finish a sweep on a 4-acre hospital campus and have 240 line segments to deliver. The project datum is local, not state-plane. How do you present the coordinates on the findings map?
Coming in the advanced track
Module 02 is live now — the rest of the advanced track extends into SUE quality levels, records reconciliation at scale, and induced-signal environments. Each module ships as a standalone lesson when the curriculum is ready.
Each advanced module ships with its own lesson page, knowledge check, and a stand-alone diagram set so the track stays useful even if you arrive mid-sequence.