Client: Department of National Defence / Defence Construction Canada
Location: Happy Valley–Goose Bay, Newfoundland & Labrador
Industry: Military

Project Overview

Defence Construction Canada engaged AAndebert Wald & Co Services to execute a multi-year monitor‑well decommissioning program across 5 Wing Goose Bay and nearby community properties. The aim was to eliminate legacy wells that could allow surface‑water infiltration or vertical contaminant migration, and to remove physical hazards – key steps in safeguarding local aquifers and supporting ongoing environmental remediation of the former air base.

Key Challenges

• Well variability: Diameters from 1 in. to 10 in.; metal and PVC construction; some under artesian pressure.
• Site logistics: Wells spanned active and non‑active airfield zones (A, B, C) with strict security protocols.
• Legacy infrastructure: Several wells were buried in 4 ft vaults or tied to obsolete product‑recovery systems.
• Locational uncertainty: Many wells on private land were missing, destroyed, or inaccessible.

Technical Execution

AAndebert Wald provided trained well technicians and professional geoscientists for all three phases (2022–2023):

1. Field Decommissioning – Employed site‑specific sealing methods based on casing type and groundwater depth.
2. Comprehensive Documentation – Logged each well, produced decommissioning records, and submitted final reports to DCC.
3. Survey‑Assisted Searches – In Phase 3, partnered with a licensed surveyor to pinpoint wells previously unlocated on private properties.
4. Adaptive Problem‑Solving – Developed on‑the‑spot solutions for wells under pressure, inside vaults, or damaged beyond access.

Results

Phase 1–2 (May–Oct 2022)
• Wells targeted: ≈ 220
• Wells decommissioned: 85 %
• Program length: 6 months

Phase 3 (Jun–Oct 2023)
• Wells targeted: ≈ 60
• Wells decommissioned: 89 %
• Program length: 5 months

– 90 % of “missing” private‑property wells were found and sealed after survey support.
– Remaining wells were either confirmed destroyed, permanently inaccessible, or already absent.

Conclusion

AAndebert Wald & Co Services successfully decommissioned the majority of legacy monitoring wells at 5 Wing Goose Bay, limiting pathways for contaminant migration and protecting local groundwater. The project showcases AAndebert Wald’s capability to deliver large‑scale well‑abandonment programs under complex military site constraints – providing e

Client: Engineering Firm
Location: New Brunswick
Industry: Oil & Gas

Project Overview

AAndebert Wald & Co Services was tasked with designing a chemical injection program to reduce benzene, toluene, ethylbenzene, and xylene (BTEX) impacts in groundwater at a decommissioned gas station site. The primary goal was to mitigate off-site migration southwest of the property boundary. To achieve this, AAndebert Wald introduced Intrasorp® Colloidal Activated Carbon (CAC) for the installation of a permeable reactive barrier (PRB)—a first-ever application of Intrasorp in Canada. The material’s superior subsurface mobility and adsorption capacity made it ideal for establishing an effective reactive zone.

Key Challenges

• BTEX Contamination: Groundwater impacted by multiple contaminants (BTEX) required a targeted, in-situ solution.
• Off-Site Migration Risk: The remediation design needed to prevent contaminants from moving beyond the property boundary.
• Budget Constraints: A multi-year, phased approach was necessary to meet the client’s financial parameters while ensuring thorough remediation.

Technical Execution

AAndebert Wald developed a three-phase chemical injection program:

1. Adsorptive/Reactive Zone: Forming a zone to trap and degrade contaminants.
2. Subsequent Degradation: Introducing chemical or biological amendments for ongoing treatment.
3. Phased Implementation: Allowing for adjustments based on site monitoring results over three years.

• Phase 1: Intrasorp CAC was injected between 1.0 to 6.0 mbgs across approximately 600 m², using 15 injection locations. After confirming the radius of influence, additional points were selected to form a two-row PRB.

Results

By tailoring a multi-year strategy, AAndebert Wald enabled the client to proceed with a cost-effective, adaptive solution. The phased approach provides flexibility for ongoing monitoring and refinement, ensuring long-term success in reducing BTEX concentrations and preventing further off-site migration.

Conclusion

This project exemplifies AAndebert Wald & Co Services’ innovative approach to environmental remediation, employing cutting-edge in-situ technologies like Intrasorp® CAC to address complex contamination challenges. Through a carefully planned, phased program, AAndebert Wald delivered a sustainable, budget-conscious solution that safeguards surrounding areas and supports future site management.

Client: Government of Canada
Location: Yellowknife, Northwest Territories
Industry: Mining

Project Overview:
AAndebert Wald & Co Services was contracted by a large engineering firm to support the cleanup of an abandoned open pit goldmine near Yellowknife, Northwest Territories. Closed in 1997 and now managed by the Government of Canada, the site required extensive remediation efforts to address hydrocarbon soil contamination, including the restoration of the Steeve’s Lake shoreline.

Key Challenges:

• Hydrocarbon Contamination: Significant free product contamination required focused extraction and monitoring efforts.
• Complex Site Dynamics: As an abandoned operation, the site presented unique logistical and environmental challenges, including the need to address contamination across multiple wells.

Technical Execution: AAndebert Wald carried out a comprehensive remediation program between 2012 and 2013, which included:

• Groundwater Monitoring: Regular monitoring of groundwater conditions to identify contamination levels and ensure effective remediation.
• Free Product Recovery: Employed an EFR (Enhanced Fluid Recovery) unit to recover free product from targeted wells.
• Soil Remediation: Addressed hydrocarbon-contaminated soils, including restoring the Steeve’s Lake shoreline and treating recovered soil.
• Data Reporting: Provided detailed reports documenting extraction efforts and cumulative recovery volumes for stakeholder review.

Extraction Results:

• In 2012, approximately 10.7 liters of free product were recovered from seven wells.
• In 2013, recovery efforts expanded to 22 wells, yielding approximately 46 liters of free product.

Outcome: AAndebert Wald successfully completed the hydrocarbon soil and water remediation efforts, supporting the site’s cleanup goals and contributing to its potential future viability. The project laid the groundwork for possible reopening of mining operations, contingent on economic conditions and the receipt of required permits.

Conclusion: This project demonstrates AAndebert Wald & Co Services’ capability to deliver tailored solutions for complex mining industry challenges. The remediation of hydrocarbon-contaminated soils and groundwater at the Yellowknife site underscores AAndebert Wald’s expertise in supporting large-scale environmental cleanups, ensuring both compliance and the preservation of natural resources.

Client: Well-established International Consultant
Location: Brevoort Island, Nunavut
Industry: Military

Project Overview:
AAndebert Wald & Co Services was engaged by a long-time client to support the clean-up of a fuel oil spill at a remote radar site on Brevoort Island, located in the Davis Strait off the eastern coast of Baffin Island. The project required the implementation of an effective water treatment system to ensure the successful completion of the clean-up effort.

Key Challenges:

• Logistical Difficulties: The remote location necessitated the transportation of all equipment, supplies, and personnel by helicopter.
• Cold Temperatures: The system had to be robust enough to maintain efficiency in cold environmental conditions.

Technical Execution: AAndebert Wald designed and deployed a comprehensive water treatment system, which included:

• Equipment Transport and Setup: All necessary components, including a feed pump, settling tank, transfer pump, sediment filters, carbon drums, and a vac system for drum cleaning and carbon replacement, were transported to the site by helicopter.
• System Operation: A technician was also flown in to operate the system, ensuring smooth and efficient functioning.

Results:

• Successful Implementation: The water treatment system operated effectively in the harsh, cold conditions of Brevoort Island.
• Project Completion: The clean-up was successfully completed within two weeks, staying on budget and meeting the project objectives.

Conclusion: This project underscores AAndebert Wald & Co Services’ ability to deliver effective and reliable solutions in challenging and remote environments. The successful deployment and operation of the water treatment system at the remote radar site on Brevoort Island demonstrate AAndebert Wald’s expertise in managing complex military environmental remediation projects.

Emergency Fuel Recovery and Water Treatment

Client: Unspecified
Location: Wallgrass, Maine
Industry: Transportation

Project Overview:
AAndebert Wald & Co Services responded to an emergency fuel spill incident on a Maine highway near the Canadian border. A fuel truck carrying 9,000 US gallons of gasoline overturned, causing a significant release of gasoline into a ditch. The spilled gasoline infiltrated a bedrock aquifer, resulting in contaminated groundwater surfacing in roadside ditches downstream from the accident site.

Key Challenges:

• Rapid Contamination Spread: The gasoline and impacted groundwater were actively spreading, necessitating immediate and effective containment and treatment.
• Sensitive Environmental Receptor: The effluent discharge criteria were extremely stringent due to the proximity to a freshwater stream.

Technical Execution: AAndebert Wald designed and implemented a comprehensive gas and groundwater recovery and water treatment system, which included:

• High-Capacity Recovery System: Engineered a system with two discharge streams, each capable of handling 75 US gallons per minute, achieving a total flow rate of 150 US gallons per minute (568 liters per minute).
• Advanced Water Treatment: Developed a treatment system to separate gasoline from water, addressing dissolved phase hydrocarbons, suspended solids, and metals to meet the direct discharge requirements into the freshwater receptor.
• Stringent Compliance: Ensured the effluent discharge met the stringent environmental criteria due to the sensitive nature of the receiving water body.

Results:

• Operational Efficiency: The recovery and water treatment system, operated by trained AAndebert Wald personnel, achieved over 95% operational efficiency.
• Environmental Compliance: The system consistently met the strict freshwater aquatic criteria, ensuring no exceedances and safeguarding the sensitive receptor.
• Rapid Response and Completion: AAndebert Wald built and deployed the system within two weeks, successfully completing the remediation and water treatment program in three months.

Conclusion: This emergency response project highlights AAndebert Wald & Co Services’ capability to quickly design, build, and operate effective remediation systems in urgent situations. The successful containment and treatment of the gasoline spill ensured environmental protection and demonstrated AAndebert Wald’s expertise in handling complex transportation-related incidents.