# Subsurface Utility GIS from ASCE 38-22 Investigation to Design Handoff

**Title tag:** Subsurface Utility GIS: ASCE 38-22 Workflow 2026  
**Meta description:** Subsurface utility GIS applies ASCE 38-22 quality levels, source lineage, geophysics, test-hole evidence, uncertainty, QA/QC, and design-ready handoffs.  
**Author:** Ashish Kumar Meena  
**Published:** September 19, 2026  
**Last updated:** September 19, 2026  
**Category:** GIS/CAD & Mapping  
**URL:** https://draftech.com/blog/subsurface-utility-gis  
**Primary keyword:** subsurface utility GIS  
**Word count:** 2524  
**Read time:** 10 minutes

![GNSS survey equipment positioned at an urban intersection with closed utility covers and pavement markings.](../../blog/img_subsurface_utility_gis.webp)

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A utility line in GIS can mean a record trace, a surface-geophysics result, a surveyed appurtenance or an exposed point. Those are not interchangeable facts. When the map stores only geometry and a generic source note, designers cannot tell whether the line can support route screening, conflict analysis or excavation planning.

This guide treats subsurface utility data as an investigation record under ASCE/UESI/CI 38-22. We organize and evaluate supplied records, survey and specialty investigation results in GIS. We do not claim to self-perform geophysical locating or test-hole excavation.

## Spend subsurface utility GIS effort where a wrong position matters

subsurface utility GIS organizes the 4 ASCE 38-22 quality levels, source lineage, uncertainty and utility identity so designers can use underground evidence at the correct risk level. ASCE/UESI/CI 38-22 is the current standard guideline for investigating and documenting existing utilities, and FHWA emphasizes that SUE is a process, not one technology.

Planning begins with a consequence-zone matrix pairing each route decision with the utility evidence it needs. Broad screening, bore profile, structure placement and excavation clearance do not receive the same investigation budget. Records may support one choice while an exposed point is justified at another. Quality is assigned to supported features or extents. It is not advertised as one corridor-wide grade.

The investigation starts with the decision and the consequence of being wrong. Broad route screening may use records and visible features differently from a congested crossing where excavation or structure placement is already being fixed in the design. We divide the project into utility-risk zones and identify the quality of evidence needed for each decision. One quality level across an entire corridor is usually too blunt.

### Select evidence depth by consequence

A request to map all utilities accurately sounds rigorous but does not define an investigation, because accuracy still depends on source, method, survey basis and utility condition. Accuracy depends on the source, method, survey basis and utility condition. We ask which conflict or design choice the data must support. The answer determines where records are enough for screening and where geophysics or exposure evidence is justified.

FHWA's current Subsurface Utility Engineering overview identifies ASCE/UESI/CI 38-22 and states that SUE is a process, not a technology. ASCE describes the standard as guidance for utility investigations during project development. Our [utility GIS mapping service](/services/gis-mapping-services/) carries that process into a feature-level evidence and handoff record. The utility engineering lead proposes the needed evidence, the buyer approves investigation effort and specialty providers own their methods. We show the consequence of each choice. We do not label a weak source accurate because schedule or budget favors it.

An unresolved conflict can move the design, trigger geophysics, require exposure or remain a documented risk where the intended use permits. That menu is the investigation plan. It is not a promise that every utility in the corridor will receive the same quality. Spending test-hole budget on a low-consequence screening reach while a bore launch sits on records-only geometry is how projects buy the wrong certainty at the exact place where being wrong is expensive.

We write that choice down before anyone mobilizes a specialty crew. The zone list names the decision, the evidence currently in hand and the next method that would actually change the answer. A designer can then spend money where a wrong position would move a pit or a structure. Screening reaches stay on records until they earn more. That is investigation, not a uniform mapping campaign.

We also refuse a corridor-wide quality slogan as a substitute for that list. A contractor can ask for Quality Level B everywhere and still miss the one crossing that needed exposure. The investigation budget should follow consequence. If the structure location is already fixed, records-only geometry at that point is not conservative. It is a deferred conflict. Put the money there first. Do not average the corridor.

## Preserve contradictory records as a design warning

Records from owners, as-builts, maps, one-call responses and prior surveys are indexed before they are reconciled. Conflicting lines remain visible with source dates and identifiers. We do not average them. Surface features and site reconnaissance can add context, but the resulting quality level reflects the investigation performed, not the neatness of the GIS geometry.

### Preserve disagreement between owners and files

**Table: ASCE 38-22 quality framework in a GIS handoff**

| Quality level | Evidence character | GIS control |
| --- | --- | --- |
| D | Records or oral information | Preserve source and date |
| C | Surveyed visible features correlated with records | Store correlation and discrepancy |
| B | Appropriate surface-geophysical designation | Attach method and limitations |
| A | Precise position at an exposed point | Bind test-hole and survey record |
| Mixed extent | Quality changes along the utility | Segment attributes at evidence boundaries |

Compilation is performed in a contradiction map that overlays owner records, one-call responses, prior plans, visible appurtenances and survey control without averaging those sources into a synthetic centerline that looks cleaner than the evidence. Original geometry remains available. Any interpreted connection becomes a derived feature with method and reviewer, allowing designers to see whether apparent continuity came from evidence or analysis.

ASCE's 2022 release notice explains that ASCE 38-22 updates and renames the former ASCE 38-02 standard, adding definitions, commentary, examples and provisions from 20 years of use. The [CAD/GIS documentation standards guide](/blog/cad-gis-documentation-standards-osp-fiber-networks) supplies the lifecycle controls needed to keep those sources distinct after import.

The GIS steward accepts source custody and derived geometry. The utility engineer determines fitness for a design use. A large discrepancy near a bore can trigger more investigation while the same discrepancy outside the project influence remains informational. By localizing the consequence, we avoid both false confidence and a blanket hold over miles of unrelated route. Snapping a record line to a visible valve may create a plausible connection that the source never established. We preserve the original record and store any interpreted geometry as a separate derived feature. The map can support screening. It can still show where the line remains inferred. That honesty is the deliverable the designer can actually use on the next conflict, not later.

## Map designation limits beside the interpreted alignment

Appropriate surface-geophysical methods can support horizontal designation where conditions allow, but results depend on material, access, interference and connection opportunities. The specialty provider records method, markings, limitations and confidence. We receive that package and link it to surveyed or mapped features without claiming the instrument response proves utility ownership, depth or facility condition.

Designation results enter a method-limit layer containing provider, equipment or technique notes, marks, survey capture, interference, access limits and unresolved anomalies. Draftech does not self-perform the locating. Our in-house team integrates the qualified provider's evidence and keeps observed, designated and interpreted geometry separable, even when a continuous cartographic line is convenient for analysis.

### Keep designation method and limitations attached

Our own GIS can make a designated line look more continuous than the field evidence. That visual smoothness is a limitation, not a quality upgrade. Interpolation between marks may be useful for analysis, but it must remain identified as interpretation. We preserve observed points or segments, derived connections and gaps separately so a designer can see where confidence changes along the same apparent utility.

> A designation segment is usable only for the decision and spatial extent supported by the provider record. A signal gap stays a gap. An inferred connection receives a different status. If the proposed structure lands where limitations could change the conflict, the investigation returns to the provider or advances to another method.

FHWA's SUE material describes Quality Level B as information obtained through appropriate surface-geophysical methods to determine existence and approximate horizontal position. ASCE 38-22 governs the broader investigation and documentation process. We do not self-perform locating. Qualified specialty providers produce the evidence that our in-house team integrates and evaluates. Map neatness never determines utility identity, depth or condition.

## Confine exposed-point quality to its supported extent

A test hole can establish precise horizontal and vertical position at an exposed point when performed and documented appropriately. It does not prove the entire alignment or condition of the facility. The record ties the exposure to survey control, utility identity, material, size, top elevation and method, then shows how far the design may reasonably use that point.

### Bind exposed points to survey and utility identity

A precise point can dominate a map because it looks more authoritative than surrounding evidence. We use it as a high-quality point. We do not stretch that quality along an unsupported alignment. If the design needs the line between exposures, the investigation plan must address that interval rather than borrowing confidence from the endpoints.

Exposed locations are managed as survey-tied point dossiers with test-hole report, utility identification, material, dimensions, elevation, photographs, restoration and custody. The exact point can control clearance at that crossing. It does not automatically improve intervening linework. Design references show the supported point and any separate assumptions used between exposures.

At an exposed point, ASCE/UESI/CI 38-22 provides the current investigation and documentation basis. The test-hole record still needs survey control, utility identity, material and dimensions appropriate to the assignment. We apply the resulting quality only to the supported point or extent. The label does not leap across an unexposed segment because the map line is continuous.

Consider a proposed bore crossing a corridor where two owner maps disagree and one designated segment ends before the launch pit. The contradiction map preserves both records, while the method-limit layer shows exactly where surface evidence exists. The design team can move the pit, request extended designation or target exposure at the conflict. Simply drawing a continuous centerline would remove those choices by hiding the evidence break that made investigation valuable.

> Quality review should sample boundaries, not only high-quality points. At an exposed point, confirm survey control, utility identity and supported use. Move along the mapped facility until the evidence changes, then verify that the GIS changes its quality or method attributes at the same place. If Quality Level A continues past the documented exposure without support, the feature segmentation is wrong even though the point itself is accurate.

The utility engineer accepts the exposed point for a specified conflict only after survey and identity records agree. A wrong or uncertain utility identification reopens the point even if coordinates are precise. Alternative interpretations are retained when they affect the selected design, not as a generic history attached to every test hole. Precision without identity is still a risk.

## Choose subsurface utility GIS depth by the decision it must protect

The final GIS should tell a designer what action follows from uncertainty. A feature carries its source, quality basis, method, supported extent and limitation, but those attributes matter only when they change a route, structure or investigation decision. We organize the handoff around consequence zones instead of pretending every utility line deserves equal confidence. Each zone also names who can request more field evidence and which design commitment must wait, turning uncertainty into a traceable assignment rather than a generic caution.

- **Route planners:** use records and visible evidence only for early screening, and treat unresolved owner conflicts as hold points rather than as a cleaned centerline.
- **Design engineers:** spend designation or exposure budget on the crossing or structure whose wrong position would change the issued design, then leave intervening quality visible.

The [GIS data conversion guide](/blog/gis-data-conversion-telecom) explains how lineage survives schema mapping. Draftech's [in-house engineers and GIS team](/about) manage that integration, while specialty locating, geophysics and test-hole providers remain responsible for the methods and evidence within their own scopes. We keep those roles labeled in the handoff.

We do not claim to self-perform those specialty investigations. We accept supplied results only for the documented use and spatial extent, then connect them to the design question they can answer. A precise point may control a bore profile without proving the alignment on either side. The remaining uncertainty stays visible instead of being averaged away.

> If full turnkey construction is separately procured, the [managed crew framework](/vendors) operates under Draftech QA/QC and safety controls. The [fiber construction package guide](/blog/fiber-construction-package-deliverables-guide) shows how those discoveries return to controlled delivery records. Crew observations do not certify SUE quality or silently extend an existing designation.

Mark the conflict where source quality changes the route. [Give Draftech that consequence zone](mailto:info@draftech.com?subject=Subsurface%20utility%20GIS%20evidence) with the owner records and specialty reports that actually reach it. Transfer is complete when a designer can identify the next risk-reduction action and explain why it is warranted. A tidy inventory is not that test.


Consequence zones are easiest to test on a segment that is about to be designed. Draftech's [no-cost permitted design of the first 20,000 linear feet](/free-design) includes the field survey and construction drawings that give a SUE handoff something to protect, and the client keeps every file that results.

## Frequently Asked Questions

### What are the ASCE 38-22 utility quality levels?

The framework uses 4 quality levels commonly identified as D, C, B and A. They represent different investigation evidence, from records through visible-feature correlation and geophysical designation to precise position at an exposed point. Apply them through the ASCE 38-22 process and record method, source, limitations and supported extent in the GIS. Quality belongs to the supported evidence extent, not automatically to an entire feature.

### Is subsurface utility GIS the same as a one-call ticket?

No. A one-call response is one input and serves the applicable damage-prevention process. It is not a complete utility engineering investigation for design. We may integrate records, visible features, geophysics, survey and test-hole evidence under ASCE 38-22. Keep a source record for each input and do not promote it beyond its supported use. A ticket response should remain identifiable by provider, date and intended purpose.

### Does Draftech self-perform utility locating or test holes?

No self-perform claim is made. Qualified specialty providers perform the required geophysical locating or test-hole field work within their scope. Our in-house engineers and GIS team integrate, evaluate and document the supplied evidence. We keep two responsibilities explicit: the specialty provider owns its field method and report, while Draftech owns the engineering integration deliverable. Those reports must stay separately attributable.

### Can Quality Level A be assigned to an entire utility line?

A precise exposed point does not automatically establish the entire alignment. Record the surveyed test-hole position and the spatial extent its evidence supports, then use other investigation methods for intervening segments. One high-quality point can constrain design at that location. Stretching its quality along an unsupported line would misstate the ASCE 38-22 evidence. Designers should see exactly where quality changes along the interpreted utility.

### What should a subsurface utility GIS deliverable contain?

Include utility features with quality, source, method, date and uncertainty; survey basis; discrepancy records; specialty reports; test-hole records; conflict references; and intended-use notes. Use 1 stable utility or feature identifier across files. The handoff should let a designer move from a mapped feature to the underlying investigation evidence without relying on color or memory. Every mapped conflict should identify the next investigation action if risk is unacceptable.

## Related Resources

- [Broadband Network GIS Mapping: A Governed Release Guide](/blog/broadband-network-gis-mapping) - GIS/CAD & Mapping
- [State DOT Permit Process for Fiber Deployment](/blog/state-dot-permit-process-for-fiber-deployment) - Permitting & ROW
- [Utility Coordination for Fiber Construction](/blog/utility-coordination-fiber-construction-process) - Permitting & Construction
- [Fiber Route Analysis in 2026](/blog/fiber-route-analysis) - FTTH & Fiber Network Design
- [Underground Fiber Permit Submission Guide](/blog/underground-fiber-permit-submission-guide) - Permitting & ROW
- [HDD Boring Fiber Installation in 2026](/blog/hdd-boring-fiber-installation) - Construction Management

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**About Ashish Kumar Meena:** Leads BEAD engineering, GIS documentation, HLD deliverables, and broadband compliance programs. [info@draftech.com](mailto:info@draftech.com)