For most construction projects that could disturb archaeological resources, start with a Phase I archaeological survey before earthwork. Phase I combines records research and systematic fieldwork to locate sites, estimate their boundaries, and recommend avoidance or additional work. It can include limited shovel tests, probes, augers, cores, or remote sensing; it is not the same as a large excavation.
Move to Phase II evaluation when Phase I finds a site that may be significant and requires a defensible National Register of Historic Places eligibility decision. Use Phase III data-recovery excavation only when an eligible site will be adversely affected, cannot be avoided or preserved, and the reviewing agency approves mitigation. The required scope depends on the project’s Area of Potential Effects (APE), land ownership, excavation depth, federal connections, and applicable state, tribal, and local standards.
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The decision in one table
| Project situation | Usually appropriate scope | Why |
|---|---|---|
| Archaeological sensitivity is possible, but no site information is available | Phase I identification survey | Locates sites, estimates boundaries, and supports initial eligibility and avoidance recommendations. |
| Phase I finds artifacts, features, or an intact deposit that may be significant | Phase II evaluation and testing | Uses closer-interval testing and controlled units to determine integrity and National Register eligibility. |
| An eligible site would be affected and avoidance or preservation is infeasible | Phase III data recovery and mitigation | Excavates under an approved research design to recover information before construction damages or destroys the site. |
| A known sensitive location or cemetery must be watched during earthmoving | Archaeological monitoring with an agency-approved strategy | Allows real-time observation and work stoppage if a feature or deposit appears; it is not a universal substitute for survey. |
| Federal land, funding, license, permit, or approval is involved | Section 106 review and possibly ARPA or other permits | The federal agency leads consultation and determines identification, evaluation, and treatment requirements. |
Survey and excavation are not interchangeable
What an archaeological survey does
A survey is an identification exercise. The archaeologist assembles existing information, examines the project area, and samples the ground in a systematic way. The result is a map and assessment of archaeological resources within the APE, along with recommendations such as no further work, avoidance, Phase II testing, monitoring, or another treatment.
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What excavation does
Excavation removes soil and archaeological deposits to expose and record stratigraphy, features, and artifacts. It is a method used at several stages, not a synonym for the entire compliance process. A few shovel-test probes may be part of Phase I. Larger, controlled units are typical of Phase II. Phase III is a treatment project designed to recover data from an eligible site that cannot be protected in place.
Because excavation removes context, it is not automatically a better survey. The least destructive method that answers the agency’s question is normally preferred. A construction manager should not decide sampling density or excavation depth without the project archaeologist and reviewing agency.
Phase I: the normal starting point
Records and background research
A Phase I scope normally begins with records and archival research. The archaeologist checks previously recorded sites, archaeological surveys, historic maps, deeds where relevant, historic building or cemetery information, and environmental and geomorphological context. Soil formation, slope, flood history, landforms, erosion, fill, and prior disturbance help determine where buried deposits could survive.
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Field inspection and subsurface sampling
The field portion usually combines a pedestrian walkover with systematic subsurface testing suited to vegetation, soils, terrain, fill, disturbance, and the depth of proposed construction. Possible methods include:
- Pedestrian transects and visual inspection of exposed ground.
- Shovel tests or other hand probes.
- Augers, soil probes, and cores where deeper or compact deposits are expected.
- Remote sensing when buried features or site conditions make it useful.
- Mechanical trenching in limited circumstances, with appropriate controls and agency approval.
Louisiana’s published example standard illustrates why spacing is jurisdiction-specific: it uses 30-meter transects and shovel-test intervals in high-probability areas and 50-meter intervals in low-probability areas, while still requiring low-probability areas to be examined. Tests should reach subsoil or 50 centimeters where applicable, and deeper testing should be considered when buried deposits are possible or the project will disturb deeper soils. Those figures are an example of one state’s standard, not a nationwide rule.
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What the Phase I report should answer
A defensible report explains the methods, coverage, environmental reasoning, field limitations, finds, site boundaries, and recommendations. It should make clear where visibility was poor, where fill or steep terrain limited testing, and whether the planned disturbance extends below the depth examined. Louisiana guidance, for example, requires the investigator to explain professional judgments and field limitations rather than simply listing test locations.
Phase II: proving significance and eligibility
When Phase II is triggered
Phase II follows a Phase I indication that a site may contain significant, intact, or otherwise important information. The key question is not merely whether artifacts are present; it is whether the site has the integrity and characteristics needed for a defensible National Register of Historic Places eligibility determination.
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Phase II uses closer-interval testing and larger, more controlled formal units than Phase I. The archaeologist documents horizontal limits, soil layers, features, artifact patterns, disturbance, and integrity. Testing is designed around explicit eligibility criteria and research questions, not a generic promise to “dig more.”
North Carolina guidance describes Phase I as identifying sites and making eligibility assessments where possible, while Phase II’s primary goal is a definitive eligibility determination. The agency, State Historic Preservation Office (SHPO), Tribal Historic Preservation Office (THPO), or other reviewing authority may require a particular unit layout, sample size, laboratory procedure, or report format.
Does a shovel test automatically become a full excavation?
No. A positive shovel test normally prompts a decision about Phase II evaluation, site avoidance, or a focused treatment. Phase II may use additional shovel tests, test units, trenches, or other controlled methods. Full-scale data recovery is a separate Phase III decision made only after eligibility and effects are established.
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Phase III: data recovery when avoidance fails
The legal and practical threshold
Phase III is mitigation for an eligible site after a finding of adverse effect, when redesign, avoidance, or preservation in place cannot protect the resource. It is not a precautionary upgrade to every survey and not a way to accelerate construction without consultation.
What must be approved
The work follows a research design and an agency-approved treatment plan. Under Section 106, a Memorandum of Agreement may be required to document the adverse effect and mitigation. The plan should identify research questions, excavation and sampling methods, artifact and environmental analyses, reporting, curation, public involvement where required, and procedures for discoveries made during the work.
Excavation changes the site’s integrity permanently. For that reason, the research design must show what information the recovery will produce and why the proposed sample is sufficient. Construction should not begin on the affected portion until the treatment, agreement, permits, and curation arrangements are in place.
When monitoring is appropriate—and when it is not
Good uses of monitoring
Monitoring can be appropriate for a known sensitive location, cemetery, or narrowly defined risk area where earthmoving can be observed continuously. The archaeologist must be positioned to see the work, communicate with operators, and stop or redirect activity if a suspected feature or deposit appears.
Why monitoring cannot replace every survey
Monitoring observes ground disturbance as it happens; it does not provide the same coverage as pre-construction identification. A buried site can be missed between equipment passes, destroyed before the monitor can recognize it, or lie outside the monitored area. North Carolina guidance cautions that monitoring is not a primary survey strategy and recommends consultation before selecting it.
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If monitoring is chosen, the plan should define the monitored limits, equipment and activities covered, archaeologist authority to pause work, notification contacts, documentation standards, and the response to artifacts, features, or human remains.
Federal triggers, Section 106, and permits
When Section 106 applies
The Advisory Council on Historic Preservation explains that Section 106 responsibilities extend to construction and land or resource planning on federal lands, and to actions on non-federal lands when a federal agency provides funding or issues a license, permit, or approval. The federal agency—not the contractor—leads the consultation and determines the identification, evaluation, and treatment requirements.
Federal involvement does not automatically dictate one national shovel-test interval. The lead agency consults with the SHPO, THPO, tribes, and other parties and applies the standards appropriate to the undertaking and its APE.
Archaeological Resources Protection Act permits
On federal or Indian lands, 16 U.S.C. § 470cc requires an application for a permit to excavate or remove archaeological resources. The federal land manager specifies the required information and conditions. National Park Service guidance explains that investigations on federal lands proceed under an ARPA permit stating the authorized research, methods, curation, and suspension conditions.
Permit needs vary with land ownership and the action proposed. A Phase I walkover on private land may not require an ARPA permit, while excavation or removal on federal or Indian land can require one even when the project is privately funded. Confirm the rule with the land manager and lead agency before fieldwork.
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How to procure the right archaeological scope
- Map every disturbance. Provide the archaeologist with the building footprint, grading limits, utilities, access roads, borrow pits, staging, stormwater work, temporary workspaces, and expected depths.
- Document jurisdiction. Identify ownership and every federal funding, license, permit, or approval connection. List tribal interests and local requirements known to the project team.
- Confirm the governing standard. Ask the SHPO, THPO, or lead federal agency which survey standard, report format, consultation path, and review schedule apply.
- Hire qualified expertise. Use a cultural-resource-management firm or archaeologist who can document Secretary of the Interior professional qualifications, has regional and site-type experience, and can manage consultation, reporting, laboratory work, curation, and agency review.
- Commission Phase I first. Require a written recommendation for no further work, avoidance, Phase II, monitoring, or another treatment. Tie the recommendation to the actual APE and disturbance depth.
- Specify Phase II deliverables if needed. Require a research design, unit layout, eligibility criteria, laboratory and curation plan, analytical methods, and schedule before field mobilization.
- Complete Phase III approvals before earthwork. Obtain the treatment plan, agreement or permit, research questions, data-recovery methods, artifact curation plan, and discovery protocols before construction can affect the site.
- Put procedures in the contract. Include stop-work authority, notification contacts, human-remains procedures, confidentiality requirements, archaeologist access, and agency communication in the construction documents.
What to do if construction finds artifacts
Stop, protect, and notify
The contract should require the operator to stop work in the immediate discovery area, protect the location from traffic and unauthorized collection, and notify the designated archaeologist and project manager. Do not move artifacts, widen the excavation, or resume work because the material appears ordinary.
Follow the jurisdiction-specific discovery plan
On federal or tribal lands, regulations and permits may require immediate protection and agency notification. Human remains, funerary objects, and cemeteries can trigger additional legal procedures and must be addressed in a separate written protocol. The archaeologist and responsible agency determine whether the find is isolated, part of a site, eligible, or subject to a treatment plan.
The plan should state who can release the stop-work order, who contacts the agency and tribe, how the area is secured, what documentation is required, and how schedule decisions are made. A generic “call an archaeologist” clause is not enough for a large project with multiple contractors.
Schedule and cost: why there is no universal number
Official guidance does not establish a single national Phase I price or duration. A defensible estimate depends on the APE size and shape, terrain and vegetation, access, landowner permissions, records complexity, expected testing density and depth, buried-site potential, laboratory work, agency review, tribal consultation, report requirements, and whether Phase II or mitigation follows.
Build the work into the critical path rather than treating it as a last-minute inspection. Allow time for records research, fieldwork, laboratory processing, report preparation, SHPO or THPO and agency review, consultation responses, redesign or avoidance, and any permit or agreement. Ask firms to separate these tasks and assumptions in their proposals so a low field price does not conceal missing reporting or curation work.
Ground disturbance depth is a major schedule variable. A shallow utility trench in previously disturbed fill may need a different approach from deep grading on an undisturbed floodplain. The archaeologist should compare the planned excavation depth with the tested soil profile and identify where deeper testing or redesign is prudent.
Common project mistakes
- Starting fieldwork after clearing. Clearing can destroy surface evidence and make the survey less reliable. Survey before disturbance whenever practicable.
- Surveying only the building pad. Utilities, roads, detention areas, borrow sources, and staging can have the same archaeological effect as the structure.
- Applying one state’s spacing everywhere. Intervals such as Louisiana’s 30-meter and 50-meter examples are not a nationwide rule. Follow the jurisdiction and site conditions that govern the project.
- Assuming a negative walkover proves absence. Vegetation, erosion, fill, and buried deposits can hide sites; systematic subsurface testing may still be required.
- Using monitoring as a universal shortcut. Monitoring manages a defined risk but does not replace identification where the agency expects a Phase I survey.
- Letting equipment operators choose archaeological depth. Sampling and excavation decisions belong to the qualified archaeologist and reviewing authority.
- Ignoring curation and reporting. Artifacts recovered under an approved project may need laboratory treatment, cataloging, permanent curation, and a specific report before the work is accepted.
- Mobilizing Phase III without an agreement. Data recovery on an eligible site requires an approved treatment, and often a Section 106 agreement and permit, before adverse effects occur.
A practical decision workflow for construction managers
- Define the undertaking and APE. Include all direct and indirect ground-disturbance areas and the deepest planned excavation.
- Check jurisdiction and federal nexus. Confirm ownership, funding, permits, licenses, approvals, tribal interests, and local standards.
- Consult the lead authority. Obtain the applicable survey standard, consultation path, report format, and contact list.
- Complete Phase I. Use records research, field inspection, and systematic testing appropriate to soils, landforms, disturbance, and construction depth.
- Act on the recommendation. Avoid the site where possible; otherwise undertake Phase II evaluation, monitoring, or another agency-approved strategy.
- Resolve eligibility and effects. If the site is eligible and construction will affect it, negotiate the treatment and mitigation required by the reviewing authority.
- Only then authorize affected earthwork. Confirm permits, agreements, discovery procedures, curation, and stop-work responsibilities are active in the construction documents.
Bottom line for the project team
A Phase I survey is the usual first step when construction may affect archaeological resources. It identifies and bounds sites with the least destructive methods that can answer the agency’s questions. Phase II is targeted testing to establish significance and National Register eligibility. Phase III is approved data recovery for an eligible site that cannot be avoided. Monitoring can protect a defined sensitive area during earthmoving, but it is not an automatic substitute for pre-construction survey. Start with the APE, jurisdiction, and ground-disturbance depth, then obtain a written scope from a Secretary of the Interior-qualified archaeological professional before the schedule is fixed.
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