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A soil laboratory report provides analytical information about the sample submitted for testing.
But the laboratory number is only the beginning of the decision.
Depending on the project, soil results may include:
Understanding the result requires considering:
PBR's decision framework specifically cautions that laboratory results apply to the submitted sample and that sampling design affects how confidently a result can represent a larger site.
A laboratory result tells you what was measured in the submitted sample using the applicable analytical method.
It does not automatically tell you what is happening across an entire:
That distinction matters.
A sample collected from one location at one depth represents that specific sample.
How confidently it represents a larger area depends on the sampling design.
Different soil tests answer different questions.
Hydrocarbon results can provide information about petroleum-related material measured in the submitted soil sample.
These results may support:
Related Service: Petroleum Hydrocarbon Testing in Soil →
Metals testing measures selected elemental concentrations.
A detection does not automatically establish contamination because some elements occur naturally in soil.
Interpretation may need to consider:
Related Service: Metals Testing in Soil →
pH indicates whether the submitted soil sample is acidic, neutral or alkaline under the applicable method.
It can influence:
Related Service: Soil Chemistry Testing →
Electrical conductivity provides information related to the soluble ionic content of the soil extract and is commonly used when evaluating salinity-related conditions.
It should not be interpreted as the same thing as sodicity.
Sodium adsorption ratio provides information about sodium relative to calcium and magnesium.
It can contribute to assessment of sodicity-related soil conditions.
PBR's documented environmental soil framework identifies nutrients among the parameters that may support land-use and reclamation decisions.
Nutrient results need to be interpreted according to:
A detection means the laboratory measured the target analyte in the submitted sample according to the applicable analytical method.
Detection does not automatically mean failure.
For example, detecting a metal does not necessarily establish that industrial contamination occurred.
The result may need to be considered against:
The important question is not simply:
“Was something detected?”
It is:
“What does the measured concentration mean for this site and this decision?”
A non-detect generally means the target was not detected above the applicable analytical reporting capability under the test conditions.
It should not automatically be interpreted as:
The entire site contains none of this contaminant.
PBR's framework specifically warns against treating a negative laboratory result as proof that an entire lot, system or site is contaminant-free.
A non-detect should therefore be considered together with:
An elevated result means the measured value is above the comparison value or criterion being used for the project.
It does not automatically determine:
The result should trigger a decision process.
Result
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Confirm applicable criteria
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Review sample location and depth
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Compare surrounding samples
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Review site history
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Determine whether additional investigation is needed
Related Resource: What to Do After an Elevated Soil Test Result →
A laboratory concentration is not meaningful in isolation.
The project team needs to understand what the result is being compared against.
Depending on the project, that may involve:
PBR's framework warns against using laboratory reports without considering the relevant specification, detection limit, uncertainty or decision rule.
PBR should provide analytical support without promising that a particular result guarantees regulatory compliance or site acceptance.
Consider two soil samples:
Even if they were analyzed for exactly the same parameters, the two results may answer very different environmental questions.
The meaning of a soil result therefore depends partly on:
Contamination may vary vertically.
A clean surface sample does not necessarily establish that deeper soil is unaffected.
Likewise, a deeper contaminated sample does not necessarily mean surface soil has the same concentration.
For environmental investigations, results should therefore be interpreted according to the specific location and depth represented by the sample.
Usually, one sample cannot confidently characterize a large or heterogeneous site.
PBR's framework identifies several sampling risks, including:
The appropriate number and distribution of samples depend on the investigation and decision being made.
A composite sample combines material from multiple increments or locations.
The reported result therefore represents the combined sample.
Composite sampling can reduce analytical cost, but PBR's framework specifically cautions that compositing can dilute localized contamination.
That makes the intended decision critical.
For example, a composite may be inappropriate when the objective is to locate a small contamination hotspot.
A petroleum hydrocarbon result should be evaluated with:
A hydrocarbon result does not by itself determine the complete extent of petroleum contamination.
Additional sampling may be needed to evaluate horizontal and vertical distribution.
Related Resource: Understanding Petroleum Hydrocarbon Results in Soil →
Metals require particular care because elements can occur naturally in soil.
Interpretation may need to consider:
measured concentration + site history + geology + background + applicable criteria
Detection alone should not be equated with industrial contamination.
These parameters describe different soil characteristics.
These values should not be treated as interchangeable.
Related Resource: Soil pH, Electrical Conductivity, Sodium Adsorption Ratio & Salinity Explained →
Comparing historical and current results can support:
But meaningful comparisons require context.
Consider whether the samples were collected using comparable:
A numerical difference does not necessarily prove a site-wide trend if the underlying samples are not comparable.
A lower result means the concentration measured in that follow-up sample is lower than the comparison result.
That may be useful evidence.
However, it does not automatically prove:
The broader sampling program remains important.
Before assuming the laboratory result is wrong, review:
PBR's framework identifies wrong matrix, inappropriate method, preservation, quantity, holding time and non-representative sampling among the major workflow risks that can weaken laboratory decision-making.
Additional testing may be appropriate when:
The next test should answer a specific question rather than simply repeat the original analysis.
Some environmental investigations require more than soil data.
If site conditions suggest contaminants may migrate to groundwater, the project team may need to consider:
PBR's environmental framework specifically identifies environmental water testing as supporting baseline assessment, impact monitoring, source investigation and remediation decisions.
This resource is particularly relevant for:
PBR Laboratories supports environmental and soil testing projects from Edmonton for clients throughout Alberta, Western Canada and Canada.
PBR's role is not simply to deliver analytical numbers.
The stronger decision framework is:
What was tested?
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Does the sample represent the question?
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What does the result mean?
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What criteria or context apply?
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What should happen next?
This follows PBR's core positioning as a laboratory that helps clients understand results and take action—not simply receive data.
Start by identifying the analyte, measured result, units, reporting or detection limit where applicable, and the criteria or reference being used. Then consider sample location, depth and site context.
Not automatically. The concentration needs to be evaluated against the appropriate criteria and project context.
It means the target was not detected above the applicable analytical reporting capability under the test conditions. It does not prove the target is absent everywhere on the site.
It means the measured value exceeds the comparison value being used. Additional investigation may be needed to determine source, distribution and significance.
Not necessarily. The confidence of a site-level conclusion depends on the sampling plan and site variability.
They can. PBR's decision framework specifically notes that compositing may dilute localized contamination.
Contaminant concentrations and soil chemistry can vary with depth. A result applies to the sampled interval.
Review the sample location, depth, sampling plan, method, previous results and site history before deciding whether additional sampling or analysis is needed.
Not automatically. It means the submitted follow-up sample had a lower measured concentration. Broader conclusions depend on the overall sampling and remediation program.
PBR can discuss the matrix, target analyte, available analytical testing and laboratory sample requirements. The broader site investigation and environmental conclusions remain project-specific.
When contacting PBR, have available where possible:
Contact PBR to discuss related testing after a positive, failed or unexpected result.