Horsley Witten Group provides environmental consulting services to a variety of clients including municipalities, developers, law firms, utilities, and commercial and
industrial property owners.

Environmental Due Diligence

We offer a wide range of Environmental Due Diligence services to help our clients make informed property acquisition decisions. Services include the preparation of ASTM International Phase I Environmental Site Assessments, Transaction Screens, Vapor Encroachment Screening, Phase II Subsurface Investigations, and peer review.
We have completed hundreds of Environmental Due Diligence Assessments on properties including large tracts of undeveloped land, multi-family residential properties, commercial properties, gasoline stations, dry cleaners, power plants, and industrial facilities throughout the United States and Mexico.

Site Assessment and Remediation

Our site assessment and remediation experts use the most cost effective and innovative technologies available. Experience includes preliminary and comprehensive site assessments, underground storage tank removal, hazardous materials surveys, abatement management (i.e., PCBs in caulk, asbestos, and lead based paint), subsurface investigations, and data collection through the installation of soil borings, groundwater monitoring wells, test pits, and soil-gas vapor probes.

Services provided are consistent with ASTM International, state, and federal regulations and include the following;

  • Environmental Due Diligence services
  • Assessment of soil, groundwater, surface water, sediment, air, and soil vapor for oil and/or hazardous materials (OHM)
  • Completion of risk assessments
  • Remediation design and oversight
  • Underground storage tank (UST) removal
  • Hazardous materials survey management (polychlorinated biphenyl [PCBs], asbestos, lead based paint)
  • Radon sampling and mitigation
  • Public outreach
  • Regulatory reporting

 Contact us  if you have a project you would like to discuss.

HW designs and implements soil and groundwater treatment systems, air sparging/ biosparging and soil vapor extraction/ bioventing systems, passive venting systems, chemical oxidation injections, dig and haul, and other methods of contaminant remediation. Contaminants of concern in our portfolio include, but are not limited to,
petroleum products, manufactured gas plant residues, chlorinated solvents, metals, per- and polyfluoroalkyl substances (PFAS) and multi-contaminant plumes.

Environmental Emergency Response

HW is prepared to respond to emergencies including sudden releases of OHM from vehicles, aircraft, construction/industrial equipment, overfilling of storage tanks, and
other accidents. Our experts have responded to numerous emergencies, developing thoughtful strategies to reduce environmental impact and liability.

Licensed Site Professional Services

HW provides Licensed Site Professional (LSP) services consistent with the Massachusetts Contingency Plan (MCP) on sites including dry cleaners, gasoline stations, manufactured gas plants, commercial properties, residential properties, and industrial properties. LSP services include site assessment, site remediation,
monitoring, public outreach, and state agency compliance.

Turnkey Services

HW provides turnkey services by combining our environmental consulting services with our wetland/wildlife consulting, site survey, civil site design, and construction
oversight capabilities for a seamless project experience. When our staff is involved early in the project, we can provide a multi-faceted team of experts who can assess
the feasibility of a project from the ground up. By identifying areas of potential environmental concern early, we save our clients time and money.

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