Injection Well Treatment

Explore targeted treatment options for contaminated groundwater with site-specific planning, practical implementation and ongoing monitoring.

Nexus Environmental Services Ltd. provides injection well treatment and well-based remediation support for contaminated commercial and industrial properties throughout Alberta.

Whether groundwater contamination remains after excavation, access limits further removal or you are evaluating treatment options for an existing site, we help determine whether a well-based approach is suitable.

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✓ Site-specific assessment of treatment suitability
✓ Treatment installation, servicing and contractor coordination
✓ Groundwater monitoring to evaluate treatment performance

Targeted Treatment for Contaminated Properties

Addressing Residual Contamination

Evaluate treatment options for groundwater impacts remaining after source removal or soil remediation.

Working Around Site Constraints

Consider well-based treatment where buildings, utilities, property boundaries or operating facilities limit excavation.

Supporting a Remediation Program

Use treatment alongside investigation, source control and monitoring as part of a coordinated cleanup strategy.

What Is Injection Well Treatment?

Injection well treatment is a form of in-situ remediation, meaning treatment takes place below ground without excavating all of the affected material.

Treatment wells provide access to selected subsurface areas. Depending on the approach, treatment materials may be introduced into the formation or installed within wells to support contaminant breakdown.

For some petroleum-contaminated sites, oxygen-releasing products can help support naturally occurring microorganisms that break down suitable contaminants. Other sites may require different treatment methods or a combination of approaches.

The treatment must be selected for the contaminants and groundwater conditions. A product that is suitable for one property may be ineffective or inappropriate at another.

Nexus evaluates the available information and coordinates an appropriate treatment scope, including specialist design or contractor support where required.

A Treatment Program May Include:

✓ Review of previous environmental investigations
✓ Assessment of contamination sources and affected areas
✓ Evaluation of groundwater and subsurface conditions
✓ Selection of an appropriate treatment approach
✓ Treatment-well installation or review of existing wells
✓ Installation or application of selected treatment products
✓ Periodic inspection, servicing or replenishment
✓ Groundwater sampling and laboratory analysis
✓ Evaluation of treatment performance
✓ Reporting and recommendations

Important: Treatment effectiveness depends on reaching the affected area and creating suitable conditions for the selected process. Multiple treatment events and ongoing monitoring may be required.

What Does Injection Well Treatment Include?

Review of Site Conditions

We review previous soil and groundwater investigations, laboratory results, well records and remediation history.

This helps establish whether sufficient information is available to evaluate treatment suitability or whether additional investigation is needed.

Treatment Feasibility

The proposed approach is assessed against the contaminants, their concentrations, groundwater conditions and the physical characteristics of the subsurface.

Relevant considerations include whether treatment can reach the contamination and whether an ongoing source could limit progress.

Treatment Planning

The plan identifies the target area, proposed delivery method, treatment objectives and monitoring requirements.

Depending on the project, pilot testing or specialist input may be recommended before a larger program proceeds.

Well Installation and Treatment Delivery

Suitable treatment wells may be installed, or existing wells may be assessed for the proposed use.

Treatment products are installed or applied according to the selected approach, product requirements and site-specific plan.

Servicing and Follow-Up

Some systems require periodic inspection, replacement of treatment products or additional applications.

Follow-up work is planned around the treatment method and observed site response.

Monitoring and Reporting

Groundwater measurements, laboratory results and relevant field parameters are evaluated to assess treatment performance.

Reports document the work completed, changes in conditions, limitations and recommended next steps.

When Should You Consider Injection Well Treatment?

Well-based treatment may be worth evaluating when:

Groundwater contamination has been identified through a Phase II ESA
Residual petroleum impacts remain after contaminated soil removal
Contamination extends into areas that are difficult to excavate
Buildings or underground infrastructure constrain removal
An existing remediation program requires additional treatment
Site conditions may support enhanced biodegradation
A treatment approach could complement source removal
Ongoing groundwater monitoring indicates that further action is warranted

It is not suitable for every contaminated property. Additional delineation, source removal or another remediation method may be more appropriate.

Evaluating Your Next Remediation Step?

Send us the property address, available environmental reports, groundwater results and information about existing monitoring or treatment wells.

We will review the available information and outline the work needed to assess treatment suitability, develop a scope and establish monitoring requirements.

If you are working toward a transaction or development deadline, include the required completion date.

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Environmental Concerns Well-Based Treatment Can Address

Depending on the selected technology and site conditions, treatment may address groundwater impacts associated with:

Historical fuel spills
Leaking underground or aboveground storage tanks
Former gas stations
Bulk fuel storage and dispensing
Automotive repair and equipment-maintenance operations
Residual petroleum contamination following excavation
Dissolved contaminants released from affected soil

Petroleum-related contaminants may include benzene, toluene, ethylbenzene, xylenes and certain petroleum hydrocarbon fractions.

Other contaminants, including some solvents, require different treatment chemistry and specialist evaluation. A petroleum-focused treatment product should not be assumed suitable for these substances.

How Do Oxygen-Releasing Treatment Products Work?

Some well-based systems use products that gradually release oxygen into groundwater.

Where oxygen availability limits biodegradation, this can help support microorganisms capable of breaking down suitable petroleum contaminants.

Treatment performance also depends on contaminant availability, groundwater chemistry, temperature, subsurface conditions and contact between the treatment zone and affected groundwater.

These products are not simply filters that collect all contamination passing through a well. Their purpose is to support a treatment process, and monitoring is needed to evaluate the response.

Can Injection Well Treatment Replace Excavation?

Sometimes it can form part of an alternative approach, but it does not automatically replace source removal.

Leaking equipment, heavily contaminated soil or separate-phase petroleum product may require other measures before well-based treatment can be effective.

Some sites benefit from a combined approach: removing an accessible source, treating residual groundwater impacts and monitoring the results.

Nexus explains the role of the proposed treatment within the overall remediation strategy.

Why Choose Nexus Environmental?

Nexus Environmental Services Ltd. is an Alberta-based environmental consulting company providing contaminated-site investigation, remediation and groundwater monitoring support.

Practical Remediation Experience

Our work combines subsurface investigation, remediation oversight and groundwater assessment to support practical treatment decisions.

Site-Specific Evaluation

Treatment recommendations consider the identified contaminants, groundwater conditions and physical constraints of the property.

Clear Communication

You communicate directly with the environmental professional managing your project. We explain the proposed treatment, expected monitoring and remaining uncertainties.

Coordinated Implementation

We coordinate treatment installation, servicing, laboratory testing and specialist contractor involvement where required.

Documented Performance

Monitoring and reporting help establish how the site is responding and whether the program should continue, change or be supplemented.

Complete Environmental Support

Nexus also provides Phase I and Phase II Environmental Site Assessments, contamination delineation, soil remediation, groundwater monitoring, risk assessment and vapour intrusion assessments.

Injection Well Treatment Services Across Alberta

Nexus Environmental Services Ltd. provides injection well treatment and well-based remediation support throughout Alberta.

Based in Lethbridge, we serve clients in Calgary, Edmonton, Red Deer, Medicine Hat, Brooks, Taber, Fort Macleod, Claresholm, Pincher Creek, Crowsnest Pass and communities across the province.

We assist property owners, developers and project teams with evaluating and implementing treatment for contaminated sites in urban and rural Alberta.

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Frequently Asked Questions

Is Injection Well Treatment Suitable for Every Contaminated Site?

No. Suitability depends on the contaminants, their distribution, subsurface conditions, groundwater chemistry and the ability to deliver treatment to the affected area.

A feasibility review is needed before selecting a product or committing to a treatment program.

Can Existing Monitoring Wells Be Used for Treatment?

Potentially, but monitoring wells are not automatically suitable treatment wells.

Their construction, screened interval, condition and location must be reviewed. Treatment can also affect nearby monitoring results, so a suitable performance-monitoring network is important.

Do Oxygen-Releasing Products Work for All Contaminants?

No. They are intended to support suitable treatment processes, such as aerobic biodegradation of certain petroleum contaminants.

Some substances require different conditions or technologies. Product selection must be based on the contaminants and site chemistry.

Will Treatment Work in Clay?

Fine-grained soils can make treatment distribution difficult. Groundwater movement and contact with contaminants may be limited or uneven.

A well-based approach may still be considered in some settings, but suitability requires evaluation and may need pilot testing.

How Long Does Treatment Take?

There is no standard completion time.

The duration depends on the contamination source, treatment method, subsurface conditions and observed response. Programs may require repeated servicing or applications over an extended period.

How Do You Know Whether Treatment Is Working?

Performance is evaluated using an appropriate combination of groundwater sampling, laboratory results, field measurements and historical trends.

A short-term decrease in concentration does not necessarily establish that remediation objectives have been achieved.

Can Contaminant Concentrations Increase Again After Treatment?

Yes. Concentrations may rebound as contamination remaining in soil or less-accessible areas continues to enter groundwater.

Follow-up monitoring helps determine whether improvements are sustained and whether further work is needed.

Does Treatment Remove the Need for Groundwater Monitoring?

No. Monitoring is an important part of evaluating treatment performance and identifying any remaining concerns.

The sampling schedule and analytical scope depend on the treatment objectives and site conditions.

Are Approvals or Notifications Required?

Requirements depend on the proposed treatment, materials used, site circumstances and applicable regulatory framework.

These requirements should be assessed during planning before treatment begins.

Does Treatment Guarantee Regulatory Closure or Lender Acceptance?

No. Treatment results must be evaluated against the project objectives and applicable requirements.

A completed treatment event does not itself establish regulatory closure, and lenders may require further monitoring or documentation.

How Much Does Injection Well Treatment Cost?

Costs depend on the treatment area, well requirements, selected products, delivery method, contractor involvement, servicing schedule and monitoring program.

Existing investigation reports are generally needed to develop a meaningful proposal.

What Information Is Needed for a Quote?

Provide the property address, previous environmental reports, recent groundwater results, monitoring-well records and information about past remediation.

Include known site constraints, your project objectives and any transaction or development deadline.

Explore a Practical Treatment Approach

Whether you are addressing residual petroleum contamination or evaluating alternatives to further excavation, Nexus Environmental Services Ltd. can help determine whether well-based treatment is appropriate for your property.

Send us the property address, available environmental reports and your project objectives to discuss the next steps.