TWS employs non-destructive methods utilizing state-of-the-art electromagnetic induction (EMI) and ground penetrating radar (GPR) equipment to locate utilities and identify subsurface hazards and obstructions.  Our goal is to identify both the type and location of underground utilities in order to prevent damage to them and the surrounding environment as well as protect you and your workers on the job site.    Contact us to learn more or obtain a quote. 



TWS provides mat placement services in work zones (e.g. wetlands) where access by equipment, both small and large, would otherwise be restricted due to challenging and/or unstable ground conditions.  Mats are placed to create access roadways, staging areas, work platforms, protect prepared subgrades, and to provide equipment stability on soft or sensitive surfaces.  TWS has designed and fabricated special tooling specifically for this service to create efficiencies and reduce overall project costs.   Contact us to learn more or obtain a quote. 


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TWS is a full service environmental company offering turnkey project management and support focused on a collaborative and integrated team approach for a full array of services.  Our personnel offer more than 40 years of experience in the environmental industry.   We strive to ensure project and safety objectives are met every day, on every site.  Contact us to learn more or obtain a quote. 


Services supported include...

  • Sonic

  • Air Rotary

  • Hollow Stem Auger

  • Direct Push

  • Cone Penetrometer Testing

  • Sampling

  • Well Installation

  • Air Knife Potholing and Sampling

  • ASTM Sample Collection

  • Angle Drilling

  • Barge Drilling

  • Bedrock Coring

  • Construction Site Dewatering

  • Geotechnical Sampling

  • Packer Testing

  • Permeability Testing

  • Pump Services

  • Soil Coring

  • Subsurface Investigations

  • Vacuum Hole Clearing

  • Vertical Aquifer Profiling

  • Well Development

  • Well Rehabilitation

  • Investigation Derived Waste Management

  • Membrane Interface Probe

  • Hydraulic Profiling Tool

  • High Resolution Injection Tool

  • Electrical Conductivity

  • Ultra-Violet Optical Screening Tool

  • Waterloo Vertical Aquifer Profiling

  • 3D Data Imaging, Interpolation & Visualization​

  • Collaborative Remediation Design

  • Design Optimization Testing

  • In-Situ Bioremediation

  • In-Situ Chemical Oxidation

  • In-Situ Chemical Reduction

  • In-Situ Chemical Desorption

  • Pneumatic & Hydraulic Emplacement

  • Thermal Remediation

  • Steam Enhanced Remediation

  • Investigation Derived Waste Disposal

  • Permeable Reactive Barriers

  • Traffic Control

  • Excavation Support

  • Site Security

  • Utility Locating (GPR)

  • Laboratory Analysis

  • Concrete Coring

  • Portable Restrooms



Passive soil gas surveys utilize adsorbent samplers that are emplaced subsurface to adsorb volatile and semivolatile organic compounds (VOCs and SVOCs) in soil gas without forcing the flow rate of gas, yielding a more representative sample than active soil gas methods. Samplers are typically placed in a grid pattern to simultaneously sample trace levels of compounds in soil gas that originate from contamination in soil or groundwater. By sampling all locations at the same time, the temporal variations in soil-gas concentrations that are known to occur daily and even hourly are normalized. Lower sampling and analytical costs of the method allow for more locations to be sampled than normally would be with a fixed budget.  Contact us to learn more or obtain a quote. 

Compaction testing serves as a method of measuring soil compaction and the bearing capacity of the ground, and can also be used to estimate soil properties, conditions and determine the types of materials.  Soil density measurements/data is recorded at incremental depths to evaluate the degree, thickness and depth of compacted layers.  Applications include artificial soil compaction testing, investigating the stability of untreated surfaces, confirming the suitability of unpaved roads to support heavy equipment, assessing job site terrains, providing basic advise for the foundations of small buildings and pedestrian bridges, and pinpointing compaction problems that may require more extensive soil testing.  It’s also useful for researching the variability or tracking the changes in soil strength caused by equipment, vehicles, and foot traffic.  Contact us to learn more or obtain a quote.