CLIENT FOCUS
 
Formed in 1991 by senior environmental consultants, EnviroGroup Limited has always focused on one thing - client service. We have worked on some of the largest environmental sites in the country: numerous high-profile mine sites, century-old lead smelters in the middle of cities, oil refineries with acres of free product, and DNAPL sites with groundwater plumes over a mile long. But we are most proud of the projects that stayed small — because of our prompt response and sound advice.
 
Envirogroup Limited Offices are located in:

• Denver, Colorado
• Longmont, Colorado
• Chicago, Illinois
• Latham, New York

Our professionals in each office serve clients across North America. Go to our Contact page for address, phone number, and email contact information.

David J. Folkes, P.E. — Principal

Mr. Folkes is a Registered Professional Engineer with over 30 years of experience in environmental and geotechnical consulting in the U.S. and Canada. As a Principal and President of EnviroGroup Limited, he provides a variety of services to natural resource, industrial and governmental clients across the country. Mr. Folkes has performed environmental site assessments at a wide variety of industrial, commercial, and natural resource sites with organic, petroleum, and metals impacts. He has managed groundwater and soil investigation and remediation projects at numerous sites, including several mining, smelting, and metals refining sites; major petroleum refinery sites; and some of the largest groundwater solvent plumes in the country. He is skilled in the forensic evaluation of the sources and causes of metals contamination in soils; solvent contamination in groundwater; and investigation and mitigation of indoor air impacts due to groundwater contamination. Mr. Folkes has provided federal and state regulators with practical experience on vapor intrusion testing, mitigation, and community interaction issues. Areas of research include background or indoor sources of solvents in air, which can be mistaken for vapor intrusion, and groundwater to indoor air correlations. He has published and presented papers on numerous environmental topics, including groundwater and vapor intrusion remediation, and served as an expert witness in both state and federal court, including testimony in three class action lawsuits.

Bence V. Close, P.E. — Principal

Mr. Close has over 26 years of environmental consulting experience in a wide variety of business sectors, including energy and mineral resource development, petroleum and chemical processing, utilities, waste management, industrial manufacturing, agriculture, water supply, land development, watershed management, and environmental compliance under various regulatory programs. He has performed permitting investigations and large-scale, complex cleanup actions for numerous clients and client groups, involving site characterization, feasibility studies, contaminant culpability, public involvement, remedial design, land reclamation, stream restoration, construction contracting and management, and litigation support, and expert witness testimony. Mr. Close is experienced with project planning and permitting of various resource extraction and energy development projects, including base and precious metal mines, industrial mineral mines, coal mines, in-situ uranium mines, sand and gravel mines, rock quarries, oil shale, heavy oil, and conventional oil and gas. His waste management and disposal experience includes reservoir analysis and permitting for underground injection of waste liquids and gases, evaporation of oil and gas production wastewaters, mine waste consolidation and capping, underground mine tunnel rehabilitation and water treatment/management, and hazardous and non-hazardous waste landfills. He has also provided litigation support and expert testimony on numerous mine site remediation/reclamation projects, soil and groundwater contamination and culpability matters, mineral development projects, and surface water quality.

Margaret (Poppy) Staub — Principal

Ms. Staub has over 18 years of experience in environmental compliance, Superfund site management, pollution prevention practices and management systems development in the mining and extractive metallurgical industries. Ms. Staub served as the Environmental Engineer, Superfund Site Manager, and Globe Plant Manager for ASARCO, Inc. During her tenure with Asarco, she gained experience with a wide variety of topics including RCRA, CWA, and CAA compliance, environmental, safety and health management system development, process management, business development, and community relations. In 2000, she successfully implemented an environmental management system at a 114 year old manufacturing facility and obtained ISO 14000 certification. She has been involved with numerous corporate level projects designed to bridge agency/company relationships and has assisted in developing and integrating corporate level management system procedures into plant level work practices. Ms. Staub was also responsible for overseeing several multi-million dollar environmental remediation projects. Ms. Staub has prepared numerous professional papers regarding mine drainage treatment, voluntary cleanup projects, public relations and environmental, health and safety management systems. She has been a guest lecturer at the Rocky Mountain Mineral Law Foundation, the Environmental Protection Agency and has been asked to speak at several functions promoting the use of management systems as a method to improve environmental compliance.

Susan B. Welt, P.E. MPH – Principal

Ms. Welt is a registered professional engineer with an MS in environmental engineering from Cornell, an MPH from the Rochester School of Medicine, and over 12 years experience in environmental consulting and regulatory work. She was a senior sanitary engineer at the New York State Department of Health providing oversight for vapor intrusion and other state lead sites. Prior to that, she worked for major consulting firms in New York, leading the development of their vapor intrusion programs and managing investigation and remediation projects at industrial, former manufactured gas plant, and Department of Defense sites across the country. She is also a Fellow of the Centers for Disease Control and Prevention Environmental Public Health Leadership Institute. Ms. Welt has extensive experience in design engineering, vapor intrusion evaluation and mitigation, forensic evaluation of sources and causes of contamination, development of risk-based remedial goals, development and oversight of company-wide and community health and safety, and regulatory compliance programs, stakeholder negotiations, and managing complex environmental projects. She has also authored numerous papers and given presentations on a variety of topics including: vapor intrusion sampling, assessment, and engineering mitigation techniques; risk based management of contaminated sediments; and in situ remedial methods for contaminated sediments and soils.

EnviroGroup Limited provides full environmental consulting services across North America, including site assessments, audits, permitting, and multi-media investigations and remediation. Our experts are strategically located in offices across the country and include professional engineers and geologists and certified specialists in areas such as hazardous material management.

We are recognized throughout the world for our expertise in vapor intrusion; mining and metals issues; environmental management and sustainability systems; surface water and groundwater issues; and reclamation at mining and metals refining sites. We have provided services on projects in Canada, Mexico, South America, Europe, Antarctica, and Australia. Our network of subcontractors and teaming partnerships provides on-site labor and familiarity with local conditions and regulatory requirements across the country and internationally.