Solutions
Solutions focus on how the problem can be solved for our clients. Each solution describes a defined outcome—such as cutoff walls, in situ treatment, bearing capacity improvement, slope stability, or habitat restoration—rather than a single construction method.
Cutoff Walls
Cutoff walls are low permeability vertical elements installed in the subsurface to control horizontal groundwater flow and limit contaminant migration. Common technologies for installing cutoff walls include slurry trenching and soil mixing.
Stabilization / Solidification
Stabilization and solidification refer to methods of reducing contaminant immobility by either chemically binding the contaminant or by locking the contaminant in a low-permeability monolith. In environmental remediation, this is often accomplished in-place via soil mixing and referred to as in situ stabilization / solidification (ISS).
Bearing Capacity Improvement
Bearing capacity improvement refers to methods used to increase the load‑carrying capacity of weak soils. Soil mixing and rigid inclusions are commonly used to improve bearing performance and reduce settlement.
Slope stability (Shear Walls)
Slope stability refers to methods used to resist lateral movement of slopes during loading or unloading, above and below the slope respectively. Shear walls installed via soil mixing are a common ground improvement system used for slope stabilization.
Excavation & Removal
Remedial excavation refers to the targeted removal of contaminated or unsuitable soils. Excavation can be performed using conventional excavators or using large diameter augers (LDA).
Steam Enhanced extraction
Steam enhanced extraction refers to thermal treatment methods used to remove volatile and semi‑volatile contaminants from soil. Steam injection through a soil mixing tool combined with vapor extraction makes for a very effective steam enhanced extraction technique that is less sensitive to soil type than other approaches.
in-situ treatment
In situ treatment refers to methods that treat contaminated soils directly in place without excavation or stabilization / solidification. Soil mixing performed with oxidants (ISCO) or reducing agents (ISCR) are common forms of in situ treatment.
Habitat Resoration
Habitat restoration refers to a variety of method to re-establish habitats damaged by contamination or other human impacts. Targeted dredging can help re-shape marine environments, wetland creation can re-establish natural filters, and in-water capping can protect aquatic environments from continued impacts due to contamination.
Deep Drains
Deep drains refer to high‑permeability subsurface systems used to control lateral groundwater flow. Polymer slurry trenching is a common method of installing deep drains that can include horizontal piping systems or just be trenches filled with permeable media.
Rigid Inclusions
Rigid inclusions are ground improvement elements that rely on an interaction with surrounding soils to create a soil-element composite that can support structural loads. Auger cast piles, soil mixed elements, or jet grouted elements could all serve as rigid inclusions if designed properly.
Demolition
Demolition refers to the controlled removal of structures to support remediation or redevelopment. Mechanical demolition and selective dismantling are commonly used demolition methods.
Funnel and Gate
Funnel and gate systems refer to groundwater control methods that combine low‑permeability cutoff walls with permeable reactive barriers (PRBs). The cutoff wall funnels can be installed using soil mixing or slurry trenching and the permeable reactive gates can be installed using polymer slurry trenching or chain mixing.
Permeable Reactive Barriers
Permeable reactive barriers are high permeability passive groundwater treatment systems that allow groundwater flow through the barrier where the groundwater interacts with reactive media in the barrier. Permeable reactive barriers can be installed via polymer slurry trenching or with a chain trencher.
Earth Retention
Earth retention refers to systems used to support soil and groundwater during excavations or grade changes. Sheet piling and soldier pile walls are common earth retention solutions.
Wetland Remediation
Wetland remediation refers to methods used to re-establish the sensitive ecosystems of wetlands. Wetland remediation can refer to establishing new wetlands where old wetlands used to be or rehabilitating wetlands damaged by human interactions.
Bench Scale Studies
Bench scale studies refer to laboratory testing programs used to evaluate soil behavior and treatment effectiveness. Mix design studies for soil mixing, slurry trenching, and jet grouting are common bench scale study types.
Consulting
Consulting refers to technical services that support planning, design coordination, and construction execution. Constructability reviews and technical evaluations are commonly provided consulting services.
Dam Grouting
Dam grouting refers to grouting of soil or rock used to control seepage and improve dam foundations. Pressure grouting is a common approach for dam grouting where the final product is often referred to as a grout curtain.
Design-Build
Design‑build refers to a project delivery approach that integrates engineering and construction under a single contract. Integrated design development and construction sequencing are central to design‑build delivery.
Pipe Grouting
Pipe grouting refers to methods used to abandon, seal, or stabilize buried pipelines and conduits. Pressure grouting is a common pipe grouting approach with the key being to develop a grout that can travel the length of the pipe while completely filling the void.