In 1995, Matthew and Thomas Clark established TMC Services (TMC), which became known in the environmental services industry for its commitment to customer satisfaction and cost-effective solutions. The brothers spent the next 20 years leading TMC from a small start-up to a formidable presence in New England. They soon realized that TMC had reached critical mass through organic growth and began expanding the company through mergers and acquisitions, which led to a merger of two of the largest and most well-respected environmental services firms in New England with ENPRO Services. Within a year of integrating the companies, TMC/ENPRO was positioned firmly as an industry leader, which drew sharp attention from some of the much larger national competitors in the environmental market space. Soon thereafter, ENPRO was acquired by National Response Corporation. The brothers stayed with the firm for a short period to ensure an orderly transition to the new company.

Green Site Services Group, Inc. (GSS) provides environmental remediation, emergency response, waste management, and petroleum construction services to residential homeowners, general contractors, engineering consultants, and municipalities throughout New England. Our work is guided and informed by our beliefs and commitments to our customers’ needs. Therefore, we maintain that all customer relations be guided by 1) Expediency – We believe every hazardous situation is an emergency. Our team is equipped with a robust knowledge of regulatory requirements and OSHA guidelines to complete jobs safely and effectively. 2) Transparency – We believe the customer should be informed of all potential risks, costs, and benefits of performing remedial actions before a project gets underway. Our team prioritizes high-quality, cost-efficient solutions. 3) Versatility – GSS maintains offices throughout the northeast staffed with operational personnel and equipment qualified to respond to various service requests.


Mr. Clark brings nearly 30 years of industry knowledge and executive experience to the table, serving in the capacity of CEO at TMC/ENPRO Services and CFO at BLOCK Builders, Inc. Mr. Clark’s expertise spans all facets of a project’s life cycle, from initial site design & due diligence, planning, permitting, implementation of remedial technologies, development, and close-out. Clark and his team have managed a variety of hazardous and non-hazardous waste & superfund sites throughout the Northeastern United States, including emergency response initiatives for Hurricane Sandy and the Deepwater Horizon Oil Spill. Mr. Clark is responsible for the overall strategy and direction at GSS.

Along with his corporate duties, Mr. Clark has availed himself of public service and philanthropy initiatives. The Worcester Business Journal membership voted him one of 2009’s “40 under Forty” in the community. He regularly donates his time and resources as a member of various organizations.



Mr. Clark has over 30 years of industry knowledge, specializing in commercial site rehabilitation and fuel management system installation and removal. Clark has performed the tank removal, installation, remediation, and maintenance of DOT fuel depot sites over the past 20+ years in Rhode Island and Massachusetts, including upgrading all fuel sites to above-ground double-wall tank systems, tank monitoring, fuel dispensing, piping, fire suppression, and state-of-the-art fuel management systems. Clark has also performed oversight of the installation, operation, and maintenance of groundwater treatment, soil vapor extraction, air sparge, CatOx, and electrical resistance heating remediation systems for various clients. Responsibilities included changing filters, recording data (i.e., flow rates, vacuum, pressure, and groundwater depths), monitoring the amount of petroleum vapors emitted in homes, surface water sampling, and solving any problems that occur within these systems. Clark has coordinated response efforts to clean up petroleum releases ranging from one to > 1,000 gallons for retail petroleum clients throughout the Northeast Region.

As the Executive Vice President and Director of Operations at GSS, Clark is directly responsible for overseeing all day-to-day operations, including the management of assets and field staff on all projects and emergency response operations. Through his leadership, he has developed a staff of diligent professionals that are proficient, discerning, and committed to providing a safe work environment and a superior customer experience.



Marie Hobson has over 25 years of experience as a bookkeeper/accountant in the construction trades industry. Upon receiving her degree in Business Management/Accounting from Massasoit Community College, Hobson began growing her career as an Assistant Bookkeeper into that of a Senior Bookkeeper/Office Manager. As Controller at Green Site Services Group, Inc., Ms. Hobson guides company financial decisions and protects assets by establishing, monitoring, and enforcing policies, operations/procedures, and internal controls. Her responsibilities have included but are not limited to payroll, yearend audits, collections, accounts payable, and accounts receivable. Hobson believes that attention to detail and clear company procedures are fundamental aspects of a successful Controller, both of which she strives to implement in her daily tasks.


Mark Pascale

Mr. Pascale has nearly 30 years of experience managing and supervising multi-disciplinary personnel (i.e., supervisors, equipment operators, foremen, sample technicians, cleanup technicians, equipment fabricators, carpenters, and subcontractors) within the petroleum industry. His specialties include fuel system construction, remodeling, and decommissioning, including fire alarm systems, drainage, overhead canopies, underground and overhead communication, pump stations, and concrete work. Pascale primary responsibilities include but are not limited to scheduling project resources; determining the budget, scope, and objectives for proposed projects; communicating between the client and State, Local, and Federal entities to ensure project coordination; enforcing proper safety compliance; and conducting field employee evaluations.


Ms. Strachan is an experienced project manager versed in subsurface remediation, spill cleanup and prevention, and hazardous waste transportation and disposal. She brings over 20 years of remedial knowledge and experience working with both public and private sector clients. In addition to her project management experience, Ms. Strachan brings a range of civic knowledge from her time at the New Hampshire Department of Environmental Services (NHDES), where she managed the DERA State Clean Diesel Program and reported directly to the State Government Energy Commission (SGEC) to achieve the State’s energy reduction goals. As a senior project manager at GSS, Ms. Strachan manages a variety of remedial and industrial projects throughout NH and MA.


Ms. Tamis has diverse experience with more than 25 years in the environmental consulting and contracting industries. She is a driven individual with extensive operations, estimating, and sales experience. Highly focused on customer satisfaction and skilled in building teams with a similar focus. Her responsibilities range from managing regional accounts to increasing company gross revenue through recruitment and retention initiatives, as well as heading operations initiatives to facilitate company growth through developing working relationships with her clients.


Mr. LaMothe brings over 30 years of industry knowledge and experience in the environmental field managing emergency response, assessment, remediation, operation and maintenance, consulting, decontamination, decommissioning, and construction projects with the ability to balance innovativeness and cost efficiency. His knowledge and experience ranges from estimating and procurement, through project close-out and regulatory compliance, throughout New England. As a Licensed Site Professional (LSP), Mr. LaMothe has successfully managed and obtained regulatory closure for 100’s of Disposal Sites in Massachusetts alone.