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John Tabella
Project Director/National Expert on Environmental Due Diligence
Reston, VA
National Expert: Environmental Due Diligence; Federal Services
O. (571) 353-2026

Mr. Tabella, PG, LEED AP®, is SCS Engineers’ National Expert for Environmental Due Diligence and for Federal Services.  He is also a Project Manager and the Environmental Services Group Leader for the SCS office in Reston, Virginia.

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    • John Tabella, PG, LEED AP®, is SCS Engineers’ National Expert for Environmental Due Diligence and for Federal Services.  He is also a Project Manager and the Environmental Services Group Leader for the SCS office in Reston, Virginia. In this capacity, he oversees all aspects of environmental services opportunities and projects primarily throughout the Mid-Atlantic region, and supports on opportunities and projects throughout the U.S.
      Practice Areas
      Mr. Tabella has over 20 years of broad environmental experience, covering environmental due diligence, mergers and acquisitions, environmental site characterization, remedial design and implementation, environmental regulatory compliance and permitting, industrial hygiene, health and safety, and related disciplines.
      As SCS’s National Expert for Environmental Due Diligence, Mr. Tabella provides support to SCS offices on environmental due diligence business development, national client contract negotiation, project execution and QA/QC of deliverables and proposals.
      Mr. Tabella also serves as the Health and Safety (H&S) Coordinator for SCS’s Reston office and its satellites. Major responsibilities in this capacity include implementing SCS’ behavior-based safety program, coordinating and evaluating H&S training and medical monitoring, H&S recordkeeping and reporting, and H&S consulting on projects.
      Contact John at 571-353-2026 or

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Mr. Tangeman is a chemical engineer nearly a decade of experience in environmental consulting. As a Senior Project Professional at SCS Engineers, he manages air quality compliance projects including permitting, compliance evaluation, site investigation and monitoring, reporting, and quality assurance/quality control projects.

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    • Mr. Tangeman is a chemical engineer nearly a decade of experience in environmental consulting. As a Senior Project Professional at SCS Engineers, he manages air quality compliance projects including permitting, compliance evaluation, site investigation and monitoring, reporting, and quality assurance/quality control projects.
      Mr. Tangeman is also experienced in hazardous materials incident response, and served for three years as a hazardous materials emergency responder on the Lincoln-Lancaster County (Nebraska) Health Department’s Emergency Response Team (ERT). Responsibilities included site threat assessment and safety evaluation, implementing defensive and offensive operations strategies, air and water quality monitoring and sampling, decontamination, and site remediation activities. As part of the ERT, Mr. Tangeman participated in field exercises and live emergency responses with members of Lincoln (Nebraska) Fire and Rescue, the Lincoln Police Department, Lancaster County Sheriff’s Office, Nebraska National Guard Civil Response Team (CRT), the Nebraska Department of Environmental Quality, the Federal Emergency Management Agency Urban Search and Rescue Team as well as site representatives and private contractors.

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Mr. Terselich has over 15 years of experience in environmental due diligence, assessments, and remediation of contaminated sites in South Florida, the Caribbean, and Latin America. He has prepared site assessment, monitoring, and remedial action work plans for submission to Miami-Dade County Department of Environmental Resources Management (DERM), Florida Department of Environmental Protection (FDEP), and Environmental Protection Agency (EPA). He also has experience preparing Spill Prevention, Control, and Countermeasure (SPCC) Plans for various facilities to prevent, prepare and respond to oil discharges by managing fuel storage tank systems in a manner that significantly reduce the potential for environmental contamination and adverse risks to human health and the environment. He has a BS in Mining Engineering, and a Masters Degree in Environmental Science.

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    • Mr. Terselich has over 15 years of experience in environmental due diligence, assessments, and remediation of contaminated sites in South Florida, the Caribbean, and Latin America. He has prepared site assessment, monitoring, and remedial action work plans for submission to Miami-Dade County Department of Environmental Resources Management (DERM), Florida Department of Environmental Protection (FDEP), and Environmental Protection Agency (EPA). He also has experience preparing Spill Prevention, Control, and Countermeasure (SPCC) Plans for various facilities to prevent, prepare and respond to oil discharges by managing fuel storage tank systems in a manner that significantly reduce the potential for environmental contamination and adverse risks to human health and the environment. He has a BS in Mining Engineering, and a Masters Degree in Environmental Science.
      Mr. Terselich has performed environmental work various government agencies such as EPA, USAID DHS, FEMA, USAF, USCG, Florida DOT, DEP, SFWMD, Miami-Dade County DERM, RER, MDAD, MDWASD, MDTA, MDPROS, and Cities of Miami, Coral Gables, Miami Gardens.
      As the Lead Environmental Due Diligence Professional as per CFR 40 312.10, he has independently inspected and prepared EDD reports for over 400 commercial and industrial facilities conducting regulatory review and interviewing property owners and site managers as well as physically inspecting the facilities for potential contamination, regulatory compliance, and report preparation as per ASTM Standard E1527-13.

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Mr. Thompson is a Senior Project Professional providing geologic consulting and mapping for both environmental documents and petroleum industry compliance and permitting.

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    • Mr. Thompson is a Senior Project Professional providing geologic consulting and mapping for both environmental documents and petroleum industry compliance and permitting. He has four years of geologic experience working in the oil and gas industry which afforded him a wide array of geologic mapping experience and knowledge of the software used to display and analyze geologic features. Mr. Thompson previously worked as a production geologist for Aera Energy, LLC for three years and following that he worked in the state of Kansas mapping oil prospects as well as being a well site geologist. His technical skills and capabilities include: Geologic Interpretation; Well Log Interpretation; Preparing documents related to Storm-water compliance; Conducting Environmental Site Assessments; Preparing environmental analyses related to geologic features and site conditions; Constructing isogeochemical maps for groundwater assessment; and Geologic Mapping, preparing maps, and preparing displays using: ArcGIS (Geographic Information System) software, EarthVision (3D Subsurface Modeling), Openworks/Decision Space Desktop software (structure contour maps, isopach maps, cross-section construction, etc.),
      Petra (geologic mapping) software, Corel-Technical Drawing software, and
      Google Sketchup software.
      During his employment as a Production Geologist for Aera Energy LLC, Mr. Thompson was responsible for maintaining and enhancing oil production within the Midway Sunset Oilfield in San Joaquin Valley, California. Parts of his tasks were to develop 3D subsurface models, structure contour maps, isopach maps, cross sections, and geophysical models for reservoir characterization. He was also responsible for evaluating geophysical logs during drilling operations, and making decisions on well completions. Creating net reservoir thickness maps, property maps, and production maps were more of his job duties. He also acted as the daily reporting geologist on exploration wells in the San Joaquin Valley.
      During his employment as a well site geologist in Kansas, Mr. Thompson was responsible for examining rock cuttings during drilling of production wells. In the process he was responsible for creating a mud-log and characterizing the reservoir. While working in Kansas, he also mapped potential prospects for drilling new wildcat and production wells.

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Ms. Thompson is a Project Professional in our Madison, Wisconsin office, specializing in landfill gas (LFG). She provides support services including NSPS regulations, design, Tier 2 landfill gas sampling, Greenhouse Gas reporting, Title V air permitting, annual and semi-annual compliance reporting, and construction quality assurance.

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    • Ms. Thompson is a Project Professional in our Madison, Wisconsin office, specializing in landfill gas (LFG). She provides support services including NSPS regulations, design, Tier 2 landfill gas sampling, Greenhouse Gas reporting, Title V air permitting, annual and semi-annual compliance reporting, and construction quality assurance.
      Ms. Thompson also served as the Assistant Project Manager for the Manatee County, Florida Debris Monitoring Services Contract. Her educational background focused on water treatment design processes.

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Mr. Tierney is a Vice President of SCS Engineers and one of our National Experts on Sustainability. He is a Professional Geologist with over 30 years of experience in environmental and sustainability engineering and has helped a wide range of organizations control and reduce their legacy environmental impacts and liabilities, lower their costs, obtain grants and permits to expand, and implement cost-saving practices.

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    • Mr. Tierney is a Vice President of SCS Engineers and one of our National Experts on Sustainability. He has 30 years of experience in environmental and sustainability engineering and has helped a wide range of organizations control and reduce their legacy environmental impacts and liabilities, lower their costs, obtain grants and permits to expand, and implement cost-saving practices. He has given talks around the country on sustainability. He holds a Master’s Degree in Water Resources Management from the University of Wisconsin and a Bachelor’s Degree in Geology and Geophysics from Boston College. He is a Wisconsin Professional Geologist, a Certified Energy Efficiency Professional, and a Certified Ground Water Professional.
      Contact Ray at 608-216-7332 or

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Mr. Timmons is a Project Professional in our Charlotte, North Carolina, office.

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    • Mr. Timmons is a Project Professional in our Charlotte, North Carolina, office.

Ms. Tober is a Senior Project Professional in SCS’s Tracer division. She has a Bachelor’s degree in Chemical Engineering.

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    • Ms. Tober is a Senior Project Professional in SCS’s Tracer division. She has a Bachelor’s degree in Chemical Engineering.

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Ms. Trenshaw is a registered professional engineer experienced in the environmental and civil engineering fields. Her project experience includes landfill design and permitting, landfill and landfill gas well construction, storm water and environmental plans, and air compliance.

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    • Ms. Trenshaw is a registered professional engineer experienced in the environmental and civil engineering fields. Her project experience includes landfill design and permitting, landfill and landfill gas well construction, storm water and environmental plans, and air compliance.

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