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A petroleum hydrocarbon result tells you the concentration measured in the submitted soil sample under the applicable analytical method.
It does not automatically tell you:
A useful interpretation follows this sequence:
PBR Laboratories supports petroleum hydrocarbon soil testing for environmental, industrial and remediation projects across Alberta, Western Canada and Canada.
A laboratory result represents the concentration measured in the soil sample submitted for testing.
Its significance depends on:
A number without this context has limited decision value.
The important question is not simply:
“Were petroleum hydrocarbons detected?”
It is:
“What does this concentration mean for this location and this environmental investigation?”
A detection means the analytical method measured petroleum-related hydrocarbons in the submitted sample above the applicable reporting capability.
Detection does not automatically mean:
The result must be interpreted against the project criteria and site context.
A non-detect generally means the target was not detected above the applicable analytical reporting capability in the submitted sample.
It does not mean the entire site contains no petroleum hydrocarbons.
A non-detect must still be considered with:
A clean sample collected far from a suspected source may answer a very different question from a clean sample collected directly within the source area.
An elevated result means the measured concentration is above the comparison value or criterion being used for the project.
That may indicate a need for additional environmental review.
However, it does not by itself determine:
A practical next-step framework is:
Elevated result
↓
Confirm units and applicable criteria
↓
Review sample location and depth
↓
Review suspected source and site history
↓
Compare nearby samples
↓
Determine whether additional horizontal or vertical sampling is needed
↓
Consider groundwater where relevant
Not necessarily.
Potential petroleum sources can include:
A laboratory result provides chemical information about the submitted sample. Source attribution usually requires the broader site investigation and other lines of evidence.
Petroleum contamination is often spatially variable.
For example:
may produce very different results.
A high result at one location does not establish that every part of the property has the same concentration.
Likewise, a clean result from one location does not prove that another area is unaffected.
Petroleum hydrocarbons can occur at different depths depending on:
A shallow sample may not represent deeper impacts.
A deeper elevated result does not automatically mean surface soil has the same concentration.
Each result should be tied to its exact sampling interval.
Laboratory testing alone does not define the entire contaminated area.
Extent is generally evaluated through additional sampling.
Samples are collected laterally around an affected area to help determine how far impacts extend.
Samples are collected at different depths to help understand how deeply the impact extends.
The laboratory provides the analytical concentrations. The site investigation determines the sampling pattern and how those data define the affected area.
Potentially.
Groundwater may be relevant where:
Soil and groundwater answer different questions.
Soil chemistry may provide useful context in some investigations.
Relevant parameters can include:
These parameters do not replace hydrocarbon testing, but they can contribute to broader site characterization.
Where bioremediation or biological degradation is being considered, microbiological testing may provide complementary information.
PBR’s environmental microbiology capabilities include hydrocarbon-utilizing bacteria for applicable environmental matrices.
Detection of hydrocarbon-utilizing bacteria may indicate that relevant organisms are present under the laboratory test conditions.
It does not prove that remediation is occurring fast enough in the field.
Chemical hydrocarbon data remain essential for monitoring contaminant concentrations.
A lower result means that the follow-up sample had a lower measured hydrocarbon concentration than the comparison sample.
That may be useful evidence of change.
It does not automatically prove:
The result should be interpreted within the broader remediation and sampling program.
An elevated follow-up result may require review of:
The next step should answer a defined question rather than simply repeating the same test.
They can.
Composite samples combine material from multiple locations.
This may provide an average concentration, but it can also dilute a localized high-concentration area when mixed with lower-concentration material.
For source investigation or delineation, grab samples may preserve more useful spatial information.
Composite sampling should be selected according to the investigation objective.
When comparing hydrocarbon data from different sampling events, check whether the results are genuinely comparable.
Consider:
A change in concentration can be difficult to interpret if multiple sampling or analytical factors changed at the same time.
Use this sequence:
This converts the result from a number into a project decision.
Additional testing may be useful when:
The next test should answer a specific environmental question.
PBR Laboratories supports petroleum hydrocarbon soil testing from Edmonton for projects throughout Alberta, Western Canada and Canada.
This is particularly relevant to:
PBR’s role is to help clients understand the analytical result in relation to the sample and the next testing decision—not simply provide a concentration.
It tells you the concentration measured in the submitted soil sample under the applicable analytical method. Interpretation depends on sample location, depth, site history and project criteria.
It means petroleum hydrocarbons were not detected above the applicable reporting capability in that submitted sample. It does not prove the entire site is unaffected.
It means the concentration exceeds the comparison value being used for the project. Additional investigation may be required to understand source and extent.
No. One result applies to one submitted sample. Additional sampling may be needed to determine the broader distribution.
No. Site-wide conclusions depend on the sampling locations, depths and broader investigation design.
Additional horizontal and vertical samples are typically used to evaluate the distribution around the identified impact.
Potentially, where site conditions suggest migration to groundwater is plausible.
It can provide complementary information where biological degradation or bioremediation is relevant, but it does not replace chemical hydrocarbon testing.
Not automatically. It shows a lower concentration in the submitted follow-up sample. Broader conclusions depend on the overall sampling and remediation program.
Yes. Composite samples can average high and low concentrations, which may reduce visibility of localized contamination.
When contacting PBR, provide where possible:
PBR can discuss related analytical testing and laboratory sample requirements for the next step.