SCS professionals are active in, and leaders of industry and professional associations. We organize and participate in workshops and conferences, author and present technical papers, conduct research, and participate in national and state-level legislative and rule-making processes and regulatory policy. Our engineers, environmental consultants, and scientists work in close coordination on environmental solutions.
Jim Walsh, PE, BCEE, is currently the Chairman of the Board of SCS Engineers. He served as our President and CEO for 22 years and is one of our National Experts on Elevated Temperature Landfills. He has worked at the forefront of sustainable solid waste management, sanitary landfills, and landfill gas (LFG) for more than 40 years. Mr. Walsh regularly serves as a Project Director and Reviewing Principal for SCS landfill and LFG projects. His project experience, coupled with his involvement in professional and industrial associations, has earned Mr. Walsh an international reputation in these specialty fields. He has authored numerous publications and technical support documents and has presented regularly at environmental conferences.
Doug Doerr, PE, is SCS Engineers’ Chief Executive Officer (CEO). His over three-decade career has exclusively been in the engineering/consulting industry, where he has focused on assisting clients with environmental and business challenges. He prides himself on developing deep and long-lasting client relationships and facilitating a servant leadership culture among colleagues. As the CEO of SCS, he is responsible for setting the company’s strategic goals, leading the executive leadership team, and managing the company’s overall health. He is passionate about working closely with the leadership team to drive a company culture that provides an unsurpassed employee experience, a collaborative One SCS environment, and client success. Ultimately, these efforts drive long-term shareholder value through the sustainable growth of SCS’s 100% employee-owned firm.
Practice Areas Have Included:
Leadership in Landfill Engineering. Over 40 years of professional experience on landfill projects. He served as Project Manager and primary author of the U.S. EPA landfill manual. He served as Project Manager and Chief Investigator on several U.S. EPA landfill R&D efforts relating to leachate, gas, and liner/cap performance. He has been engaged in over 100 landfill design and permitting projects, including sites with double composite liner systems. He has managed or directed several successful greenfield and landfill expansion permits with individual design capacities in excess of 25 million tons of solid waste.
Leadership in Landfill Gas. Over 40 years of professional experience on landfill gas (LFG) projects. Past Director of the leading LFG professional organization, the SWANA Landfill Gas Division. Received top award in landfill gas practice, the SWANA Landfill Gas Distinguished Service Award in 1997. He has served as Principal Investigator multiple landfill gas R&D projects for U.S. EPA, U.S. DOE, and Gas Research Institute. He has authored numerous publications and technical support documents in LFG. He has presented dozens of times on LFG at environmental conferences. He has been engaged as chief design engineer, Principal Investigator, or Project Manager on over 300 landfill gas projects over the years. Landfill gas related subjects have included gas migration and control, energy recovery, odor management, and compliance with air and solid waste rules including CAA, NSPS, Title V, NSR, PSD, NESHAP, and Subtitle D.
Leadership on Landfill Fire and Elevated Temperature Landfills. Principal investigator or chief engineer on over thirty dedicated landfill fire and elevated temperature landfill projects. He has provided guidance to landfill operators to avoid landfill fires. He has investigated landfill fires in-situ, and developed management and mitigation programs to address landfill fires and related events when they do occur. He has presented at environmental conferences on the subject of landfill fires. He served on the Ohio EPA Committee formed to address landfill fires and elevated temperature landfills in the state, and assisted in the development of the Ohio EPA Guidance Document on the subject.
Doug Doerr, PE, is SCS Engineers’ Chief Executive Officer (CEO). His over three-decade career has exclusively been in the engineering/consulting industry, where he has focused on assisting clients with environmental and business challenges. He prides himself on developing deep and long-lasting client relationships and facilitating a servant leadership culture among colleagues. As the CEO of SCS, he is responsible for setting the company’s strategic goals, leading the executive leadership team, and managing the company’s overall health. He is passionate about working closely with the leadership team to drive a company culture that provides an unsurpassed employee experience, a collaborative One SCS environment, and client success. Ultimately, these efforts drive long-term shareholder value through the sustainable growth of SCS’s 100% employee-owned firm.
Doug Doerr, PE, is SCS Engineers’ Chief Executive Officer (CEO). His over three-decade career has exclusively been in the engineering/consulting industry, where he has focused on assisting clients with environmental and business challenges. He prides himself on developing deep and long-lasting client relationships and facilitating a servant leadership culture among colleagues. As the CEO of SCS, he is responsible for setting the company’s strategic goals, leading the executive leadership team, and managing the company’s overall health. He is passionate about working closely with the leadership team to drive a company culture that provides an unsurpassed employee experience, a collaborative One SCS environment, and client success. Ultimately, these efforts drive long-term shareholder value through the sustainable growth of SCS’s 100% employee-owned firm. Doug is a degreed and licensed civil engineer with a BS from the University of Nebraska-Lincoln and an MBA from the University of Kansas.
Doug has directed or conducted numerous projects involving all facets of solid waste management nationwide, including the permitting, design, construction, and compliance of various types of disposal facilities and supporting infrastructure. Projects include feasibility and financial studies, due diligence, facility siting, site investigations, environmental studies, and permitting, design, and construction services for solid waste landfills, industrial waste landfills, utility waste/coal combustion residuals impoundments and landfills, transfer stations, power plants, and various other industrial and commercial facilities. Permitting and compliance efforts have involved solid waste, stormwater, air permits, environmental and local/regional/state use, and zoning requirements.
Curtis Jang is the President of SCS Engineers. He partners closely with our Chief Executive Officer, other members of our executive management team, and the Board of Directors to develop strategies for allocating capital and organizational improvement. He leads the strategic direction and alignment of all corporate services, including finance, information technology, human resources, legal, and mergers and acquisitions. Mr. Jang holds degrees in Economics and Liberal Arts and has over 3 decades of experience in the engineering and construction industry, 15 years with SCS.
Curtis Jang is the President of SCS Engineers. He partners closely with our Chief Executive Officer, other members of our executive management team, and the Board of Directors to develop strategies for allocating capital and organizational improvement. He leads the strategic direction and alignment of all corporate services, including finance, information technology, human resources, legal, and mergers and acquisitions. Mr. Jang holds degrees in Economics and Liberal Arts and has over 3 decades of experience in the engineering and construction industry, 15 years with SCS.
Nathan Hamm, PE, is a Senior Vice President, our Chief Strategy Officer (CSO), and is a leader in Leachate and Wastewater Management. He has over two decades of environmental engineering consulting experience. Throughout his career, he has worked on projects for a variety of industries, including solid waste management, alternative energy, power generation, meat processing, and agricultural production. His core technical expertise is industrial wastewater and landfill leachate treatment, solid waste landfill design and construction, and civil site development. Mr. Hamm is a licensed professional engineer in Iowa, Kansas, Missouri, Montana, North Dakota, Oklahoma, and Texas.
Mr. Hamm is a Senior Vice President, our Chief Strategy Officer (CSO), and a leader in Leachate and Wastewater Management. He has over two decades of environmental engineering consulting experience. His core technical expertise is industrial wastewater and landfill leachate treatment, anaerobic digestion, solid waste landfill design and construction, and civil site development. He is responsible for managing complex projects, maintaining client relationships, and providing technical guidance while leading the firm’s strategic business development.
Throughout his career, he has worked on projects for a variety of industries, including solid waste management, alternative energy, power generation, meat processing, and agricultural production. He has served in a variety of technical and management roles, including project engineer, project manager, client manager, team leader, and office manager. He is adept at listening to clients’ needs, understanding the underlying business and personal drivers, and developing solutions to their most challenging environmental problems.
Eddy Smith, PE, is our Chief Operating Officer, responsible for implementing companywide strategies across our business units and practices. He previously served as Senior Vice President and Corporate Project Director, as well as the Business Unit Director for our Southeast Region. He has a BS in Civil Engineering from Georgia Tech and an MS in Environmental Engineering from the University of Florida. Eddy has over 30 years of environmental and civil engineering design, consulting, and construction experience involving solid waste and stormwater management, contamination assessment and remediation. He has led several large landfill redevelopment and groundwater remediation projects in Florida. He was the founder and President of ES Consultants in Miami, which merged with SCS in early 2012. He serves on the SCS Board of Directors and oversees the implementation of the firm’s 2022 Strategic Plan and the Client Success initiative. He is a licensed Professional Engineer in Florida.
Eddy Smith, PE, is our Chief Operating Officer, responsible for implementing companywide strategies across our business units and practices. He previously served as Senior Vice President and Corporate Project Director, as well as the Business Unit Director for the Southeast Region. He has a BS in Civil Engineering from Georgia Tech, an MS in Environmental Engineering from the University of Florida, and is a licensed Professional Engineer in Florida. He serves on the SCS Board of Directors and oversees the implementation of the firm’s 2022 Strategic Plan and the Client Success initiative.
Eddy has over 30 years of environmental and civil engineering design, consulting, and construction experience involving solid waste and stormwater management, contamination assessment and remediation. He has led several large landfill redevelopment and groundwater remediation projects in Florida. He was the founder and President of ES Consultants in Miami, which merged with SCS in early 2012. Before his promotion to Senior Vice President, Eddy served as the Director of the Florida and Georgia regions, which experienced significant growth under his leadership. Eddy’s long-standing working relationships with many of the environmental regulators in South Florida have proven to be greatly beneficial to the clients he serves.
Eddy’s management and technical experience is demonstrated by his successful execution on some of the largest, highest-profile, and environmentally sensitive projects in South Florida including the Old South Dade Landfill Closure Enhancement design/build project, and the Virginia Key, Homestead, Munisport (Biscayne Landing), and Peerless Landfill re-development projects in which he led the engineering and permitting.
Jay Hatho is a Senior Vice President of SCS Engineers, serving as our Chief Technology Officer/Chief Information Officer and national expert on technology services. He started the SCS development organization at SCS, which spearheads the development of innovative technologies for all data collection and automation aspects of the firm. Jay has introduced groundbreaking technology solutions previously unseen in the environmental engineering sector. These advancements have significantly lowered the operational costs of engineering projects and are now marketed as products to clients, leading to the creation of a software application, SCS eTools.
Additionally, Jay has been instrumental in developing advanced AI models for the company. These AI models enhance our technology offerings by providing sophisticated data analysis, predictive maintenance, and automated decision-making capabilities. This integration of AI has further solidified SCS Engineers’ position as a leader in technological innovation within the environmental engineering industry.
Jay Hatho is a Senior Vice President of SCS Engineers, serving as our Chief Technology Officer/Chief Information Officer and national expert on technology services. He started the SCS development organization at SCS, which spearheads the development of innovative technologies for all data collection and automation aspects of the firm. Jay has introduced groundbreaking technology solutions previously unseen in the environmental engineering sector. These advancements have significantly lowered the operational costs of engineering projects and are now marketed as products to clients, leading to the creation of a software application, SCS eTools.
Additionally, Jay has been instrumental in developing advanced AI models for the company. These AI models enhance our technology offerings by providing sophisticated data analysis, predictive maintenance, and automated decision-making capabilities. This integration of AI has further solidified SCS Engineers’ position as a leader in technological innovation within the environmental engineering industry.
Steve Liggins, CPA, is a Senior Vice President and the Chief Financial Officer (CFO) of SCS Engineers. He is responsible for the finance and accounting operations of the company. He is a certified public accountant with 15+ years of experience in related financial positions. Mr. Liggins has a Master’s degree in Taxation from Golden Gate University and a BA in Business Management and Accounting from Western Michigan University, Haworth College of Business.
Steve Liggins, CPA, is a Senior Vice President and the Chief Financial Officer (CFO) of SCS Engineers. He is responsible for the finance and accounting operations of the company. He is a certified public accountant with 15+ years of experience in related financial positions. Mr. Liggins has a Master’s degree in Taxation from Golden Gate University and a BA in Business Management and Accounting from Western Michigan University, Haworth College of Business.
Stacey Dolden is a Senior Vice President and serves as our Chief People Officer as a member of our executive leadership team. In this role, she leads the Human Resources function and drives the company’s overall people strategy, ensuring alignment with the firm’s mission and growth objectives. Stacey holds a BA in Psychology and an MA in Industrial/Organizational Psychology. She is also a certified Senior Certified Professional with the Society for Human Resource Management (SHRM-SCP®) and a Senior Professional in Human Resources (SPHR®), bringing deep expertise in shaping people-focused strategies that support organizational success.
Stacey Dolden is a Senior Vice President and serves as our Chief People Officer as a member of our executive leadership. In this role, she leads the Human Resources function and drives the company’s overall people strategy, ensuring alignment with the firm’s mission and growth objectives. Stacey holds a BA in Psychology and an MA in Industrial/Organizational Psychology. She is also a certified Senior Certified Professional with the Society for Human Resource Management (SHRM-SCP®) and a Senior Professional in Human Resources (SPHR®), bringing deep expertise in shaping people-focused strategies that support organizational success.
Robert Gardner, PE, BCEE, is a Senior Vice President with expertise in landfill engineering, landfill gas management, solid waste studies, landfill environmental systems, liquids management, operation and maintenance, and construction. He works closely with SCS’s national and regional clients. Mr. Gardner is also our National Expert on Solid Waste Collection & Routing and on Solid Waste Finance and Rate Studies.
Mr. Gardner is a Senior Vice President with expertise in landfill engineering, landfill gas management, solid waste studies, landfill environmental systems, liquids management, operation and maintenance, and construction. He works closely with SCS’s national and regional clients. Mr. Gardner is also our National Expert on Solid Waste Collection & Routing and on Solid Waste Finance and Rate Studies.
Practice Areas
Since joining SCS in 1980, Mr. Gardner has completed solid waste, hazardous waste, environmental assessment, facility design, compliance audit and other environmental study projects for municipal and private clients. Projects typically have involved feasibility studies, due diligence investigations, facility siting, site investigations, environmental studies, permitting, design and construction services.
Facilities have included landfills, landfill gas control facilities, material recovery facilities, transfer stations, wastewater treatment plants, and support facilities (e.g., roadways, buildings, stormwater, utilities). Other projects have included waste composition studies, rate studies, compliance audits, site assessments, and preparation of various procurement documents.
Mr. Gardner has participated in or directed numerous environmental site assessments, contamination assessments, remedial action plans and remedial construction projects throughout the United States. Project sites have included fuel storage facilities, vehicle maintenance facilities, truck stops, chemical processing plants, active and closed landfill sites, abandoned chemical disposal sites, and superfund sites. Chemical contamination encountered in both soil and groundwater media has included petroleum, heavy metals, dioxin, pesticides, heavy metals, PCBs, and solvents.
Dan Cooper, PE, is a Vice President and our National Solid Waste Services Market Leader. He has expertise in all aspects of landfill and landfill gas projects, including design, permitting, and construction. His experience includes landfill Gas Collection and Control System (GCCS) design, permitting, and expansions, landfill gas (LFG) electrical generators, Title V compliance, GCCS and construction CQA, and greenhouse gasses. Mr. Cooper also provides engineering, project management and client support for stormwater water management, landfill scale house design, transfer station design, pump station design and hurricane debris management projects.
Dan Cooper, PE, is a Vice President and our National Solid Waste Services Market Director. He has expertise in all aspects of landfill and landfill gas projects, including design, permitting, and construction. His experience includes landfill Gas Collection and Control System (GCCS) design, permitting, and expansions, landfill gas (LFG) electrical generators, Title V compliance, GCCS and construction CQA, and greenhouse gasses. Mr. Cooper also provides engineering, project management and client support for stormwater water management, landfill scale house design, transfer station design, pump station design and hurricane debris management projects.
Mike McLaughlin, PE, JD, is a Senior Vice President and one of our National Experts on Brownfields & Landfill Redevelopment. He is a licensed engineer and attorney with over 45 years of professional experience providing advice on environmental matters, especially with respect to hazardous waste and Superfund issues. He is an expert on environmental compliance, remediation, and allocation of response costs. He has served as Chair of the Environmental Law Section of the Virginia State Bar and in a variety of leadership roles with the American Bar Association Section of Environment, Energy and Resources.
Mike McLaughlin, PE, JD, is a Senior Vice President and one of our National Experts on Brownfields & Landfill Redevelopment. He is a licensed engineer and attorney with over 45 years of professional experience providing advice on environmental matters, especially with respect to hazardous waste and Superfund issues. He is an expert on environmental compliance, remediation, and allocation of response costs. He has served as Chair of the Environmental Law Section of the Virginia State Bar and in a variety of leadership roles with the American Bar Association Section of Environment, Energy and Resources.
Mr. McLaughlin advises developers, contractors, lenders, and land development professionals on the technical and regulatory requirements for construction on Brownfields sites nationwide. His combined engineering and legal background provides an unusual perspective on land development where hazardous wastes or other environmental challenges are present. Redevelopment of closed landfills is an area of special interest; he worked on his first such project in 1976.
In addition to his extensive Brownfields redevelopment experience in North America, Mr. McLaughlin has worked at some three dozen Superfund National Priorities List sites in 17 states, and on scores of regulatory compliance, voluntary cleanup, and remediation projects for commercial, industrial, municipal, and military clients. He is also well-versed in liquids management.
He is a licensed professional engineer in Virginia and New Mexico.
Mike Miller, CHMM, is a Senior Vice President, National Environmental Services Market Leader, and one of our National Experts on Environmental Due Diligence and on Solid Waste Collection and Routing. He has a wide variety of experience in the environmental management and consulting field in both the private and federal sectors. Mike oversees many environmental projects across the region and coordinates environmental due diligence projects nationally including transactional due diligence, M&A due diligence, brownfield assessment and redevelopment, environmental compliance consulting, environmental permitting, and environmental remediation. His environmental background includes assessment of common special concerns related to redevelopment projects specifically, asbestos, lead-based paint, Poly-chlorinated biphenyls (PCBs), Underground Storage Tanks (UST) and overall risk mitigation, monitoring and management.
Mike Miller, CHMM, is a Senior Vice President, National Environmental Services Market Leader, and one of our National Experts on Environmental Due Diligence and on Solid Waste Collection and Routing. He has a wide variety of experience in the environmental management and consulting field in both the private and federal sectors. Mike oversees many environmental projects across the region and coordinates environmental due diligence projects nationally including transactional due diligence, M&A due diligence, brownfield assessment and redevelopment, environmental compliance consulting, environmental permitting, and environmental remediation. His environmental background includes assessment of common special concerns related to redevelopment projects specifically, asbestos, lead-based paint, Poly-chlorinated biphenyls (PCBs), Underground Storage Tanks (UST) and overall risk mitigation, monitoring and management.
Mike provides environmental management and consulting to the private and federal sectors and develops and implements environmental health & safety (EH&S) programs and solutions at industrial facilities in the agricultural processing, chemical processing, distribution/transportation, metals, and pharmaceutical manufacturing sectors.
Prior to joining SCS, Mr. Miller was responsible for providing environmental compliance support to Postal Service facilities in 15 Western U.S. states. In this capacity, he forecasted, negotiated, and managed an annual budget of $5,000,000. He effectively communicated environmental liabilities to senior management with regard to ongoing operations and planned capital projects, identified compliance alternatives and/or corrective actions to mitigate risk, and monitored implementation of necessary actions. Specific environmental activities included asbestos, lead-based paint, and radon gas management, underground storage tank management, environmental auditing, spill planning, stormwater management, and other regulatory compliance activities.
Mr. Miller has also served as an environmental consultant in Omaha, Nebraska where he provided a wide array of EH&S services to various industrial clients throughout the Midwest.
Tom Barham is SCS’s Senior Vice President and General Counsel. He is also SCS’s Senior Vice President of Construction Services. He is a member of the Virginia and District of Columbia bars and a licensed contractor in 15 states. He has served as an adjunct professor in the Department of Civil Engineering at the University of Maryland for over 3 decades. He holds a Bachelor of Science in Building Construction from Virginia Tech and a Juris Doctorate (with honors) from George Washington University. He has over 3 decades of experience in the construction industry.
Tom Barham is SCS’s Senior Vice President and General Counsel. He is also SCS’s Senior Vice President of Construction Services. He is a member of the Virginia and District of Columbia bars and a licensed contractor in 15 states. He has served as an adjunct professor in the Department of Civil Engineering at the University of Maryland for over 3 decades. He holds a Bachelor of Science in Building Construction from Virginia Tech and a Juris Doctorate (with honors) from George Washington University. He has over 3 decades of experience in the construction industry.
Mr. Barham enhances SCS Field Services’ full-service capabilities with expertise in construction management, including procurement, scheduling, budgeting, estimating, and other contract formation and administration activities.
Mr. Barham has directed several full service (design/build) projects. He has been involved in numerous projects such as Landfill Gas (LFG) collection systems (blower/flare stations, extraction wells, horizontal collection trenches, header lines, and condensate collecting/containment systems); groundwater pump and treat systems (stripping towers, recharge galleries, groundwater wells, deep recharge wells, collection/distribution piping, and pump stations); bio-treatment facilities (containment areas, moisture/nutrient application, and soil mixing); underground storage tanks (excavation, testing, triple rinse, and restoration); soil vapor extraction systems (cat/ox treatment facilities, vapor extraction wells, collection header lines, and air make-up wells).
Galen Petoyan directs SCS’s nationwide Operations, Monitoring, and Maintenance, (OM&M) practice. He has technical and management experience in environmental engineering, including design, construction, and operation of regulatory compliance systems and energy recovery facilities.
Galen Petoyan directs SCS’s nationwide Operations, Monitoring, and Maintenance (OM&M) practice. He has technical and management experience in environmental engineering, including design, construction, and operation of regulatory compliance systems and energy recovery facilities.
Practice Areas
Mr. Petoyan’s experience has primarily involved landfill gas (LFG) control and recovery; landfill fire containment, control, and emergency response; surface emission monitoring and control; odor detection and management; liquids management, including leachate collection, treatment, and disposal; volatile organic compound (VOC) vapor extraction and disposal; groundwater pump and treat; landfill post-closure monitoring, maintenance, and reporting; data management, validation, and reporting; remote telemetry; compliance auditing; and health and safety program deployment and implementation.
Mr. Petoyan is also responsible for implementing the firm’s technical review, quality assurance, health and safety, and compliance audit programs. Other remediation experience includes underground storage tank (UST) removal, dig-and-haul, and bioremediation cleanup of contaminated soil.
Pete Carrico is a Senior Vice President with over 35 years of experience with SCS Field Services (a division of SCS Engineers) in the operation, maintenance, and monitoring (OM&M) of landfill gas (LFG) management systems. He is also the Assistant Director of our OM&M Division. His experience ranges from hands-on, technical fieldwork to management of field teams performing routine and non-routine LFG system operations and maintenance.
Pete Carrico is a Senior Vice President with over 35 years of experience with SCS Field Services (a division of SCS Engineers) in the operation, maintenance, and monitoring (OM&M) of landfill gas (LFG) management systems. He is also the Assistant Director of our OM&M Division. His experience ranges from hands-on, technical fieldwork to management of field teams performing routine and non-routine LFG system operations and maintenance.
As the Assistant Office Director for SCS Field Services’ Operation, Monitoring and Maintenance Business Unit, Mr. Carrico provides leadership and management of the Business Unit’s Eastern United States operations, including some 100 employees working on over 250 projects. These projects represent a variety of different LFG control and recovery systems for both regulatory compliance and energy use, including vertical and horizontal gas extraction, air injection, open and enclosed flaring systems, electronic gas detection systems, and remote LFG data collection. Mr. Carrico’s experience provides SCS-FS with a practical, hands-on management capability for a wide range of projects.
His past projects include the Medley Landfill in Medley, FL; the Old Dominion and King and Queen Landfills near Richmond, VA; the East Carolina Landfill in Aulander, NC; the Prince William County Landfill near Manassas, VA; the Medina Landfill in Lawrenceville, VA; and the Stafford County Landfill in Stafford, VA. These projects represent a variety of different LFG control and recovery systems for both regulatory compliance and energy use, including vertical and horizontal gas extraction, air injection, open and enclosed flaring systems, electronic gas detection systems, and remote LFG data collection. Mr. Carrico’s experience provides SCS-FS with a practical, hands-on management capability for a wide range of projects.
Concurrent with project management responsibilities, Mr. Carrico helped develop SCSeTools® for compiling, reporting, and using collected data for operations and investment. Other relevant experience has included conducting LFG training seminars for employees and clients, and participation as an instructor and presenter in LFG industry seminars and symposiums.
Bob Dick, PE, is a Senior Vice President and the Business Unit Director of SCS Engineer’s Mid-Atlantic operations, stretching from Maine to South Carolina. He is also one of our National Experts on Elevated Temperature Landfills. He has over three decades of experience on civil and environmental engineering projects related to solid waste management, and has performed landfill and landfill gas engineering projects (design, permitting, construction, and operations) in more than 15 states and several foreign countries. He is a licensed Professional Engineer in Virginia and North Carolina, a Board Certified Environmental Engineer (BCEE), and a member of the American Academy of Environmental Engineers and Scientists.
Bob is a Senior Vice President and the Business Unit Director of SCS Engineer’s Mid-Atlantic operations, stretching from Maine to South Carolina. He is also one of our National Experts on Elevated Temperature Landfills. He has over three decades of experience on civil and environmental engineering projects related to solid waste management, and has performed landfill and landfill gas engineering projects (design, permitting, construction, and operations) in more than 15 states and several foreign countries. He is a licensed Professional Engineer in Virginia and North Carolina, a Board Certified Environmental Engineer (BCEE), and a member of the American Academy of Environmental Engineers and Scientists.
Bob has also directed and completed numerous project assignments related to solid waste planning and facility projects which have involved residential and commercial collection and recycling programs, as well as convenience centers, composting facilities, and material recovery facility design, permitting, construction, and operations consulting.
Authored several publications and made numerous presentations on air quality, solid waste management, landfill engineering and LFG management/control, design/operations, GHG emissions, composting, and regulatory compliance.
Bob Isenberg, PE, PG, is a Senior Vice President of SCS Engineers and our National Expert on Geotechnical, and Landfill Design/Construction Quality Assurance. He has over four decades of consulting experience in geotechnical and civil engineering projects involving design, analysis, testing, permitting, construction, remediation and repair of solid waste facilities, retaining structures including dams, mine tailing basins, earthen embankments and reservoirs, buildings including power plants, commercial and residential housing and studies of soil and groundwater contamination.
Mr. Isenberg, PE, PG, is a Senior Vice President of SCS Engineers and our National Expert on Geotechnical, and on Landfill Design/Construction Quality Assurance. He has over four decades of consulting experience in geotechnical and civil engineering projects involving design, analysis, testing, permitting, construction, remediation and repair of solid waste facilities, retaining structures including dams, mine tailing basins, earthen embankments and reservoirs, buildings including power plants, commercial and residential housing and studies of soil and groundwater contamination. He possesses extensive experience with design of bottom liner and leachate collection systems, final covers, subsurface investigation, redevelopment and remediation of older municipal and private waste landfills, and studies of soil and groundwater contamination.
Carlo Lebron, PE, is a Senior Vice President and the Business Unit Director of the Southeast Region. He has over two decades of experience in a wide variety of environmental projects with particular emphasis on solid waste management, working on projects in more than half the country. He has experience in landfill gas collection systems and landfill gas-to-energy projects nationwide. He is a licensed Professional Engineer in Florida, Georgia, Alabama, North Carolina, and Puerto Rico.
Mr. Lebron, PE, is the Business Unit Director for SCS’s Southeast region. He has a broad and diverse solid waste engineering background, including landfill gas, groundwater, landfill services, and solid waste facilities projects. Mr. Lebron has been practicing solid waste engineering since 1999 and has worked on projects in more than half the country. He has experience in landfill gas collection systems and landfill gas-to-energy projects nationwide. He has experience with over one hundred landfill gas projects; these include evaluation, design, permitting, construction, and operation. Mr. Lebron has led a solid waste group with experience in construction management and oversight of landfills, landfill gas collection systems, soil vapor extraction systems, and other solid waste construction projects. He has extensive experience with Title V permitting and other regulatory requirements associated with landfill gas collection systems, such as NSPS and NESHAP.
Robert Legaspi is a Senior Vice President and Assistant Business Unit Director of our O&M Division. He has 3 decades of experience in planning, directing, and implementing landfill gas (LFG) and groundwater operation, maintenance, and monitoring (OM&M) and construction projects.
Robert Legaspi is a Senior Vice President and Assistant Business Unit Director of our O&M Division. He has 3 decades of experience in planning, directing, and implementing landfill gas (LFG) and groundwater operation, maintenance, and monitoring (OM&M) and construction projects.
Michelle Leonard is a Senior Vice President of SCS Engineers and our National Expert on Solid Waste Planning & Recycling. She has over 35 years of experience in environmental consulting and project management, with emphasis in Sustainable Materials Management, including solid waste management planning and facilities. She helps public and private sector clients prepare solid waste management plans; designs and implements waste reduction, recycling, and reuse programs; and evaluates existing programs to identify opportunities to reduce, reuse, and recycle solid waste. She prepares plans and permits for transfer stations, material recovery facilities (MRFs), and drop-off and buy-back centers.
Michelle Leonard is a Senior Vice President of SCS Engineers and our National Expert in Solid Waste Planning & Recycling. She has over 35 years of experience in environmental consulting and project management, with emphasis in Sustainable Materials Management, including solid waste management planning and facilities. She helps public and private sector clients prepare solid waste management plans; designs and implements waste reduction, recycling, and reuse programs; and evaluates existing programs to identify opportunities to reduce, reuse, and recycle solid waste. She prepares plans and permits for transfer stations, material recovery facilities (MRFs), and drop-off and buy-back centers. She completes environmental impact assessments, facility permit applications, odor and dust control plans, and other support documents. Ms. Leonard has a strong working knowledge of solid waste management regulations and practices, and has prepared numerous successful projects to city, county, and state regulators.
Ms. Leonard is a member of the Solid Waste Association of North America (SWANA), including International Board Past President; Past Director of SWANA’s Recycling and Special Waste Technical Division; and is on the Board of Directors of SWANA’s Southern California Founding Chapter (2009 to present). She is also a Past Director of the Southern California Waste Management Forum and Past President of the Women’s Environmental Council. She was appointed by the Secretary of Commerce as a Member of the Environmental Technologies Trade Advisory Committee.
Monte Markley is a Senior Vice President and our National Expert for Deep Well and Underground Injection Control and for Carbon Capture and Sequestration. He also manages our Wichita office. His project experience includes engineering geology evaluations related to salt caverns, geologic isolation of fluids and compressed gasses, hydrogeological investigations at landfills and quarries, liquids management, regulatory compliance, and permitting, groundwater investigations at superfund and RCRA facilities, remedial system design, cost allocation and recovery from responsible parties. He is a Professional Geologist licensed in the state of Kansas.
Monte Markley is a Senior Vice President and our National Expert for Deep Well and Underground Injection Control and for Carbon Capture and Sequestration. He also manages our Wichita office. His project experience includes engineering geology evaluations related to salt caverns, geologic isolation of fluids and compressed gasses, hydrogeological investigations at landfills and quarries, liquids management, regulatory compliance, and permitting, groundwater investigations at superfund and RCRA facilities, remedial system design, cost allocation and recovery from responsible parties. He is a Professional Geologist licensed in the state of Kansas.
Pat Sullivan, BCES, CPP, REPA, is a Senior Vice President and the Business Unit Director of our Southwest Region, encompassing California, Arizona, Nevada, Utah, and New Mexico. Pat is a Harvard-degreed scientist, a Registered Environmental Property Assessor (REPA), Board Certified Environmental Scientist (BCES), Certified Permitting Professional (CPP) in the South Coast Air Quality Management District (SCAQMD), and an accredited Lead Verifier under the California Air Resources Board (CARB) AB 32, Oregon, and Washington Greenhouse Gas (GHG) programs. He is our National Expert on the Clean Air Act and on Odor Management. He has over three decades of professional experience, all with SCS. He is active in 12 industry organizations, including the National Waste and Recycling Association (NW&RA), Solid Waste Association of North America (SWANA), and Air and Waste Management Association (AWMA).
Pat Sullivan, BCES, CPP, REPA, is a Senior Vice President of SCS Engineers and the Business Unit Director of our Southwest Region, encompassing California, Arizona, Nevada, Utah, and New Mexico. He is our National Expert on the Clean Air Act and Odor Management and is a Member of the Company’s Management Advisory Committee. He also serves as the Practice Leader for SCS’s Solid Waste Practice in the Southwest, and he oversees companywide Air Quality, GHG and Risk Assessment programs. Mr. Sullivan has over three decades of environmental engineering experience (all with SCS), specializing in solid waste management and other environmental issues.
Mr. Sullivan is also one of the National Experts on odor, air quality, risk assessment, and toxic exposure issues for solid waste facilities. Mr. Sullivan is the Principal-in-Charge for numerous projects related to air quality permitting and compliance, GHG emissions and climate change, LFG engineering and compliance, facility investigation and risk assessment, redevelopment of impacted properties, and soil and groundwater investigations at solid waste and other industrial facilities, as well as related engineering services.
Mr. Sullivan has published and/or presented over 150 technical papers and/or presentations in industry journals, publications, conferences, seminars, and workshops. He has also been a litigation expert on numerous cases related to his fields of expertise.
He has worked closely with regulatory agencies at the federal, state, and local levels. His expertise has been developed managing large-scale contracts, programs, and projects at the state and national levels. His management experience includes managing professional and field staff and all aspects of operational performance, customer service, and project management. He has extensive knowledge of regulatory permitting and compliance. His Real Estate training has been pivotal in large scale property acquisitions, divestitures, and development in the solid waste, oil and gas and renewable energy sectors.
Bob Viers, P.E. is a Senior Vice President and a Project Director for our SCS Energy division. He is the Lead Design Engineer for many types of energy projects and supervises the design or design/construction of almost all of SCS Energy’s landfill gas power generation projects and renewable natural gas projects.
Bob Viers, P.E. is a Senior Vice President and a Project Director for our SCS Energy division. He is the Lead Design Engineer for many types of energy projects and supervises the design or design/construction of almost all of SCS Energy’s landfill gas power generation projects and renewable natural gas projects.
His experience includes designing, manufacturing, and maintaining customized mechanical skids and mechanical packages for a wide range of industries. His responsibilities include review of proposals from bidders and subcontractor’s submittals for compliance with project specifications, codes and regulations, and company standards; equipment inspections during fabrication; management of personnel; preparing project budgets; equipment commissioning; and technical support and specifications. Fabricated packages use positive displacement blowers, sliding vane compressors, multi-stage centrifugal blowers, pumps, liquid ring vacuum pumps, and other rotating equipment used in the environmental, power, water and wastewater treatment, flash-freezing, and commercial sectors. Bob is a Professional Engineer licensed in dozens of states.
Vidhya Viswanathan, PE, is a Senior Vice President with solid waste engineering, infrastructure design, and construction project expertise. She is the Director of Engineering of our Southwest region where she leads our solid waste engineering operations in California, Arizona, Nevada, Utah, and New Mexico. She is a licensed Professional Engineer in California, Arizona, Nevada, and Oklahoma.
Vidhya Viswanathan, PE, is a Senior Vice-President and the Director of Engineering for SCS Engineers’ Southwest region. She spent the early years of her career in solid waste management as an owner/operator, and the last decade as an environmental consultant in the field of landfill/landfill gas engineering and compost facility design. Vidhya is recognized for her innovative engineering plans and designs that are helping major entities move both traditional solid waste and renewable energy programs toward more efficient reuse, recycling, and composting practices. She works to design solutions that help these entities achieve their goals to reduce carbon emissions and conserve landfill space as they transition to meet the strict new California legislation SB1383. Corresponding to the changes in the industry, she is taking on renewable energy, recycling and composting projects. She is a 2019 Waste360 40under40 award winner, which recognizes inspiring and innovative professionals under the age of 40 whose work in waste, recycling and organics have made a significant contribution to the industry. She was also recognized in the ‘Top 50 Influential Women in Engineering for 2022’ by the San Diego Business Journal. She is a civil engineer with more than 20 years of experience, licensed in the states of California, Arizona, Nevada, and Oklahoma. Vidhya is based in San Diego, CA
Darrin Dillah, PE, PhD, BCEE, is a Senior Vice President of SCS Engineers and heads up our LFG/Engineering Group in SCS’s Reston, Virginia office. His group works on a variety of solid waste engineering design/build projects ranging from biogas/landfill gas and landfills to pump stations, transfer stations, and biogas energy plants. Dr. Dillah has over three decades of experience in the environmental engineering field, including LFG system and landfill design, lecturing and research, feasibility studies, environmental assessments, economic analysis, construction oversight, health and safety implementation, and operation and maintenance.
Dr. Dillah is a Senior Vice President of SCS Engineers and heads up our LFG/Engineering Group in SCS’s Reston, Virginia office. His group works on a variety of solid waste engineering design/build projects ranging from biogas/landfill gas and landfills to pump stations, transfer stations, and biogas energy plants. Dr. Dillah has over three decades of experience in the environmental engineering field, including LFG system and landfill design, lecturing and research, feasibility studies, environmental assessments, economic analysis, construction oversight, health and safety implementation, and operation and maintenance.
Dr. Dillah has also served as an expert witness in his field and as a technical advisor on several international projects, traveling to locations like New Zealand, Nigeria, Argentina, and Mexico.
Jeffrey J. Grill is the Business Unit Director of our SCS Energy division, a Vice President of SCS Engineers, and our National Expert on Landfill Gas and Biogas to Energy. His expertise includes designing, constructing, operating, and maintaining biogas to Renewable Natural Gas & energy facilities, including Landfill Gas-to-Energy facilities, biogas treatment facilities, and power plants. He has over 2 decades of experience in energy and renewable natural gas (RNG) project development, engineering, and management. His core values are quality, consistency, and engineering excellence.
Jeffrey J. Grill is the Business Unit Director of our SCS Energy division, a Vice President of SCS Engineers, and our National Expert on Landfill Gas and Biogas to Energy. His expertise includes designing, constructing, operating, and maintaining biogas to Renewable Natural Gas & energy facilities, including Landfill Gas-to-Energy facilities, biogas treatment facilities, and power plants. He has over 2 decades of experience in energy and renewable natural gas (RNG) project development, engineering, and management. His core values are quality, consistency, and engineering excellence.
Before becoming the Business Unit Director, Jeffrey led the Energy group’s process engineering division, which is responsible for the design of all SCS’s RNG facilities. He provides a wide array of engineering and management services ranging from conceptual to detailed design and implementation. Jeffrey has built an execution portfolio of 19 patents and applications. He has designed over 50 Renewable Natural Gas processing plants with a combined designed production capacity equivalent to 16% of California’s 2021 residential natural gas consumption. This is equivalent to almost one and a half percent of the US residential natural gas consumption, equating to a reduction of over 4.1 million tons of CO2 GHG emissions or 2.1 million tons of coal burned annually. The capacity of the landfill gas to pipeline quality RNG projects that Jeffrey has supervised or designed totals over 335 MMCFD for landfill gas to RNG, and over 34 MMCFD for dairy digester and municipal WWTP gas to RNG.
Greg Helland, RG, LG, is a Vice President and serves as the Northwest Business Unit Director. His technical experience includes management and project experience related to site assessment, RI/FS, environmental monitoring and data management, hazardous waste characterization, regulatory compliance, remediation and management, Brownfields, permitting, NEPA/SEPA, and human health and ecological risk assessment.
Mr. Helland is a Vice President and serves as the Director of our Northwest Operations. His technical experience includes management and project experience related to site assessment, RI/FS, environmental monitoring and data management, hazardous waste characterization, regulatory compliance, remediation and management, Brownfields, permitting, NEPA/SEPA, and human health and ecological risk assessment. Mr. Helland has also served as project director for stormwater compliance, UST management and closure, spill prevention planning, and hazardous waste management/minimization projects.
As Northwest Business Unit Director, Mr. Helland is ultimately responsible for ensuring that all contracts and scopes of work are properly executed, and that clients are provided with the highest quality data and deliverables. He ensures that regular internal project reviews are completed, that clients are kept apprised of progress and any changes, and that the clients’ expectations are satisfied.
Eric Nelson is the Business Unit Director of our Upper Midwest Region. He is also a Vice President and one of our National Experts for Electric Utilities. He is an engineer and hydrogeologist with over 20 years of experience. Mr. Nelson’s diverse experience includes solid waste landfill development, soil and groundwater remediation, and brownfield redevelopment. He is a licensed Professional Engineer in Wisconsin and Iowa.
Eric Nelson is the Business Unit Director of our Upper Midwest Region. He is also a Vice President and one of our National Experts for Electric Utilities. He is an engineer and hydrogeologist with over 20 years of experience. Mr. Nelson’s diverse experience includes solid waste landfill development, soil and groundwater remediation, and brownfield redevelopment. He is a licensed Professional Engineer in Wisconsin and Iowa.
Mr. Nelson has worked with utility clients to complete numerous projects for dry CCR landfills, CCR ponds, and general environmental monitoring and compliance. He has been involved with CCR landfill projects that include feasibility analyses and permitting of landfill expansions; hydrogeologic and geotechnical site investigations; site design and operating plans; soil borrow source identification and permitting; liner and final cover construction liner, cover, and stormwater management repairs. He has worked with utility clients to evaluate, plan, permit and complete CCR pond repairs and closures.
Mr. Nelson’s environmental monitoring and compliance experience includes groundwater monitoring; oil containment design and construction; and Spill Prevention, Control, and Countermeasure (SPCC) planning. This diverse project experience has provided him the opportunity to work on challenging and innovative projects that have included design and permitting for wetland and stream mitigation, identifying and avoiding former underground mines during site design, and assessing the feasibility of installing a solar photovoltaic system on a closed CCR landfill.
Mr. Nelson’s additional areas of expertise include remedial action planning, cost estimating, bidding and construction documents, and construction quality assurance. He has worked with electric utilities, solid waste facility owners/operators, and private property owners and developers.
Lee Pyle is a Vice President of SCS Engineers, the Business Unit Director of our SCS Tracer Division, and our National Expert on Risk Management Plans and Process Safety Management. Ms. Pyle serves as lead engineer on many projects and prepares Risk Management and Safety Management Programs as she has for the past 3 decades. She is a key element in developing the Risk and Safety program at the SCS Tracer group, including document preparation, engineering studies, and technical studies for various industries. Ammonia refrigeration expertise includes in-depth knowledge of industry standards such as the International Institute of Ammonia Refrigeration (IIAR) and the Refrigerating Engineers and Technicians Association (RETA).
Lee Pyle is a Vice President of SCS Engineers, the Business Unit Director of our SCS Tracer Division, and our National Expert on Risk Management Plans and Process Safety Management. Ms. Pyle serves as lead engineer on many projects and prepares Risk Management and Safety Management Programs as she has for the past 3 decades. She is a key element in developing the Risk and Safety program at the SCS Tracer group, including document preparation, engineering studies, and technical studies for various industries. Ammonia refrigeration expertise includes in-depth knowledge of industry standards such as the International Institute of Ammonia Refrigeration and the Refrigerating Engineers and Technicians Association.
Ms. Pyle specializes in risk programs for chemical processes, particularly ammonia refrigeration and water/wastewater treatment facilities. Ms. Pyle has developed EPA Risk Management Program submittal documentation (Risk Management Plans) for dozens of facilities, including Executive Summaries detailing each facility’s safety features, management structure, and potential risks associated with the process for EPA review and approval.
Ms. Pyle has worked with industry groups to develop standardized Process Safety Management Programs (PSM) for industry members to ensure compliance with OSHA’s 1910.119 regulation (Cal-OSHA Title 8, §5189). She has also been involved in auditing facility PSM programs. Ms. Pyle’s experience includes all aspects of preparing documentation for PSM and California’s Accidental Release Prevention Program (CalARP) programs. This includes participating in Hazard and Operability Studies as the team leader, quality control, preparing qualitative risk assessments, and conducting off-site consequence analyses. Her vast experience in developing programs for numerous facilities has generated new approaches and innovative methods for managing and implementing individual PSM programs.
Additional experience includes preparing Operations Manuals for facilities transferring bulk oil; supporting SCS Tracer’s RECLAIM and Clean Air Act Amendment – Title V permitting programs by developing potential-to-emit and actual emission profiles as well as outlining detailed process flow diagrams for industrial facilities; developing emissions inventories for natural gas storage facilities and refineries; and conducting detailed air quality inspections of industrial facilities in support of developing federal operating permits.
Jeff Reed, PE, is the Director of our Texas region, a Vice President of SCS Engineers, and one of our National Experts on Landfill Design/Construction Quality Assurance (CQA). He has over three decades of experience working predominantly on solid waste landfill projects. Project experience includes stormwater management, erosion control, hydrogeologic/hydraulic analysis, landfill and transfer station design, landfill and transfer station permitting, geosynthetic lining and cover systems, landfill leachate control, slope stability analysis, and construction quality assurance (CQA). He is a licensed Professional Engineer in Texas and eight other states, and has provided design and consulting services for projects at over 100 landfill facilities in North America.
Jeff Reed, PE, is the Director of our Texas region, a Vice President of SCS Engineers, and one of our National Experts on Landfill Design/Construction Quality Assurance (CQA). He has over three decades of experience working predominantly on solid waste landfill projects. Project experience includes stormwater management, erosion control, hydrogeologic/hydraulic analysis, landfill and transfer station design, landfill and transfer station permitting, geosynthetic lining and cover systems, landfill leachate control, slope stability analysis, and construction quality assurance (CQA). He is a licensed Professional Engineer in Texas and eight other states, and has provided design and consulting services for projects at over 100 landfill facilities in North America. He is a member of the American Society of Civil Engineers and the Solid Waste Association of North America.
Anastasia Welch, PE, is the Business Unit Director for SCS Engineer’s Central Region, effective January 1, 2024. She is a Vice President and Project Director with nearly 25 years of experience in solid waste management and civil engineering. Her expertise centers on solid waste management, including landfill design and permitting, construction oversight, operational metrics, compliance, and long-term planning. She is a Professional Engineer licensed in Kansas, Missouri, Iowa, and North Dakota.
Anastasia Welch, PE, is the Business Unit Director for SCS Engineer’s Central Region, effective January 1, 2024. She is a Vice President and Project Director with nearly 25 years of experience in solid waste management and civil engineering. Her expertise centers on solid waste management, including landfill design and permitting, construction oversight, operational metrics, compliance, and long-term planning. She is a Professional Engineer licensed in Kansas, Missouri, Iowa, and North Dakota.
Her solid waste management experience includes groundwater monitoring, landfill design and permitting, construction oversight, air compliance issues, bioreactor studies, and alternative cover design. Although based in our Central Region, Ms. Welch leverages the experience of SCS personnel from across the company to meet our clients’ expectations and needs.
