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 the Chairman of SCS Engineers effective January 1, 2024. 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 presents regularly at environmental conferences.
Jim Walsh, PE, BCEE, is the Chairman of SCS Engineers effective January 1, 2024. 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 presents regularly at environmental conferences.
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 on 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.
Contact Jim at 513-421-5353 or
Doug Doerr, PE, is SCS Engineers President and CEO effective January 1, 2024. He previously served as a Senior Vice President and the Business Unit Director of SCS Engineers’ Central region. Doug has more than 30 years of professional consulting experience and is one of the founding principals of Aquaterra Environmental Solutions, Inc., which merged with SCS Engineers in 2013. His technical expertise lies in the solid waste management arena and includes all facets of design, permitting, compliance, and economic/financial studies. He has also been involved with many other projects, including air permitting and compliance, traditional civil engineering, alternative energy planning and implementation, and environmental investigation and remediation. His Business Unit has been active in several recent strategic initiatives, including leachate and industrial wastewater treatment and carbon sequestration using underground storage. 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 Doerr, PE, is SCS Engineers President and CEO effective January 1, 2024. He previously served as a Senior Vice President and the Business Unit Director of SCS Engineers’ Central region. Doug has more than 30 years of professional consulting experience and is one of the founding principals of Aquaterra Environmental Solutions, Inc., which merged with SCS Engineers in 2013. His technical expertise lies in the solid waste management arena and includes all facets of design, permitting, compliance, and economic/financial studies. He has also been involved with many other projects, including air permitting and compliance, traditional civil engineering, alternative energy planning and implementation, and environmental investigation and remediation. His Business Unit has been active in several recent strategic initiatives, including leachate and industrial wastewater treatment and carbon sequestration using underground storage. 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.
Practice Areas
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, and air permits along with various other environmental and local/regional/state use and zoning requirements.
Contact Doug at (913) 749-0702 or
Robert Gardner, PE, BCEE, is a Senior Vice President and leads SCS’s nationwide solid waste management practice, including 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 and leads SCS’s nationwide solid waste management practice, including 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.
Contact Bob at 757-466-3361 or
Mr. McLaughlin, PE, JD, is SCS Engineers’ Senior Vice President of Environmental Services and our National Specialist on Brownfields & Landfill Redevelopment. He is a licensed engineer and attorney with over 40 years of professional experience providing advice on environmental matters. He is an expert on environmental compliance, remediation, and allocation of response costs. He is also a member of the Board of Governors of the Virginia State Bar Environmental Law Section, and Budget Officer of the American Bar Association’s Section of Environment, Energy and Resources (ABA SEER).
Mr. McLaughlin, PE, JD, is SCS Engineers’ Senior Vice President of Environmental Services and our National Specialist on Brownfields & Landfill Redevelopment. He is a licensed engineer and attorney with over 40 years of professional experience providing advice on environmental matters. He is an expert on environmental compliance, remediation, and allocation of response costs. He is also a member of the Board of Governors of the Virginia State Bar Environmental Law Section, and Budget Officer of the American Bar Association’s Section of Environment, Energy and Resources (ABA SEER).
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, a member of the Virginia Bar, and active in the American Bar Association (Section of Environment, Energy and Resources and Waste Management Committee), the Virginia State Bar Environmental Law Section, and the Urban Land Institute.
Contact Mike at 571-353-2002 or
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. 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 Greenhouse Gas (GHG) programs. He is our National Expert on the Clean Air Act and the New Source Performance Standard (NSPS) and on Odor Management. He has over three decades of professional experience, all with SCS. He is also the Practice Leader for 01-SWs Solid Waste Practice. He leads the firms strategic initiative for Sustainability, Greenhouse Gas, and the Clean Air Act. He is a member of the SCS Management Advisory Committee. He is active in 12 professional organizations, including National Waste and Recycling Association (NW&RA), Solid Waste Association of North America (SWANA), and Air and Waste Management Association. Pat is a member of the Hall of Flame for the SWANA LFG/Biogas Division and has received SWANAs Distinguished Individual Achievement Award. He has also received NW&RAs Distinguished Service Award and has published/presented over 120 papers and presentations in industry publications/ conferences. His technical expertise includes air permitting and compliance, GHG emissions and climate change, human health and ecological risk assessment, landfill investigation and redevelopment, and LFG engineering. He has also worked in the 01-SW Environmental Services (ES) group and formerly managed the Northern California ES practice.
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 the New Source Performance Standard (NSPS). He also serves as the Practice Leader for SCS’s Solid Waste Practice in the Southwest, and he oversees companywide 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 also oversees SCS’s company-wide GHG and Risk Assessment programs and is one of the national experts on risk assessment and toxic exposure issues for solid waste facilities. He is a Senior Vice President and Member of the Company’s Management Advisory Committee.
He is the Principal-in-Charge for 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, seminar, and workshops.
He has worked closely with regulatory agencies on the federal, state and local level. His expertise has been developed managing large-scale contracts, programs, and projects on a state and national level. His management experience includes managing professional and field staff and all aspects of operational performance, customer service, and project management. He has an extensive knowledge of regulatory permitting and compliance. His Real Estate training has been pivotal in large scale property acquisitions, divestitures, and development in the oil and gas and renewable energy sectors.
Contact Pat at 916-361-1297 or
Mr. 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 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 storm water 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.
Contact Eric at 608-381-0753 or
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.
Contact Bob at 804-378-7440 or
Mr. Miller is a Senior Vice President and our National Expert on Environmental Due Diligence. He 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.
Mr. Miller is a Senior Vice President, Project Director, and our National Expert on Environmental Due Diligence. He 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.
Prior to his Federal service, Mr. Miller was an environmental consultant in Omaha, Nebraska where he provided a wide array of EH&S services to various industrial clients throughout the Midwest.
Contact Mike at 402-884-6202 or .
Bob Isenberg, PE, PG, is a Senior Vice President of SCS Engineers and our National Expert on Geotechnical, and Landfill Design and 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 and 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.
Contact Bob at 571-353-2013 or
Mr. Reed is the Director of our Texas region, a Vice President of SCS Engineers, and one of our National Experts on Landfill Design and Construction Quality Assurance. He has over three decades of experience working predominantly on solid waste landfill projects. Project experience includes storm water 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 nine other states.
Mr. Reed is the Director of our Texas region, a Vice President of SCS Engineers, and one of our National Experts on Landfill Design and Construction Quality Assurance. He has over three decades of experience, working predominantly on solid waste landfill projects. He is a licensed Professional Engineer in Texas, Alabama, Florida, Louisiana, Minnesota, Mississippi, North Carolina, New Mexico, Oklahoma, and South Carolina.
His project experience includes storm water management, liquids 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. He has provided design and consulting services for projects at over 100 landfill facilities in 26 states across the U.S. and in Canada.
He is a member of the American Society of Civil Engineers and the Solid Waste Association of North America.
Contact Jeff at 281-293-8494 or
Bob Viers, P.E. is a Senior Vice President and the Business Unit Director of our SCS Energy division. He is also our National Expert on Landfill Gas and Biogas to Energy. 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 the Business Unit Director of our SCS Energy division. He is also our National Expert on Landfill Gas and Biogas to Energy. 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 included 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; preparation of project budgets; equipment commissioning; and technical support and specifications. Fabricated packages utilized 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.
Contact Bob at 562-426-9544 or
Nathan Hamm, PE, is a Senior Vice President and our National Expert for Liquids 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 and our National Expert for Liquids Management. He has over two decades of environmental engineering consulting experience. His core technical expertise is industrial wastewater and landfill leachate treatment, solid waste landfill design and construction, and civil site development. He is responsible for managing complex projects, maintaining client relationships, and providing technical guidance.
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 client’s needs, understanding the underlying business and personal drivers, and developing solutions to their most challenging environmental problems.
Contact Nathan at 913-749-0705 or
Ms. 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 has been involved in the preparation of over 100 Risk Management and Safety Management Programs. She is a key element in the development of the Risk and Safety program at SCS Tracer Environmental, including document preparation for specific Administrating Agencies throughout the state of California and ensuring that all our risk programs are acceptable to these agencies.
Ms. Pyle is a Vice President of SCS Engineers, the Business Unit Director of our Tracer Environmental Division, and our National Expert on Risk Management Plans and Process Safety Management. Ms. Pyle serves as lead engineer on many projects and has been involved in the preparation of over 100 Risk Management and Safety Management Programs. She is a key element in the development of the Risk and Safety program at SCS Tracer Environmental, including document preparation for specific Administrating Agencies throughout the state of California and ensuring that all our risk programs are acceptable to these agencies.
Ms. Pyle specializes in risk programs for chemical processes in particular, ammonia refrigeration facilities and water/wastewater treatment facilities. Ms. Pyle has developed EPA Risk Management Program submittal documentation (Risk Management Plans) for dozens of facilities, including developing 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.
Contact Lee at 760-744-9611 or
Ms. 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.
Ms. 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.
Contact Michelle at 626-792-9593 or
Mr. Hatho is a Senior Vice President of SCS Engineers, our Technology Officer/Chief Information Officer, and our National Expert on Technology Services. He is responsible for developing new technologies that collect, monitor and control systems in the field. He has developed and deployed new hardware and software not previously utilized in the environmental engineering field. These new technologies help to reduce the costs of running and operating engineering projects, and are now sold as a product to clients. This helped launch a product development organization at SCS known as SCS eTools.
Mr. Hatho is a Senior Vice President of SCS Engineers, our Technology Officer/Chief Information Officer, and our National Expert on Technology Services. He is responsible for developing new technologies that collect, monitor and control systems in the field. He has developed and deployed new hardware and software not previously utilized in the environmental engineering field. These new technologies help to reduce the costs of running and operating engineering projects, and are now sold as a product to clients. This helped launch a product development organization at SCS known as SCS eTools.
Jay has leveraged hardware, software, and wireless technology to streamline the operations, maintenance, and monitoring of data that is collected at landfills. Landfills and landfill gas in particular, along with other industries must comply with government regulations. Collecting, storing and analyzing compliance data is expensive because traditionally it was time consuming and sometimes dangerous to collect. SCS Technology developed a secure and user-friendly web-based application to identify, collect, track, and report in real-time the data required to meet compliance regulations. The components work wirelessly and are built to last even under extreme weather conditions.
Mr. Hatho also oversees the modernization and standardization of SCS’s IT organization to support the company’s growth. He is responsible for deploying modern technologies to help improve communication throughout the company and for leading the development of software products both internally and for clients.
Prior to joining SCS, Mr. Hatho developed technology platforms and infrastructure for a major online brokerage firm, and served as the director of engineering for a major computer manufacturer. He started large organizations overseas and locally that improved business and helped increase revenues for several companies, and managed multi-million dollar engineering budgets while maintaining strict fiscal controls and disciplines.
Contact Jay at 562-426-9544 or
Mr. 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. This experience has ranged from hands-on, technical fieldwork to management of field teams performing routine and non-routine LFG system operations and maintenance. Mr. Carrico is also the Assistant Director of our OM&M Division.
Mr. 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. This experience has ranged from hands-on, technical fieldwork to management of field teams performing routine and non-routine LFG system operations and maintenance. Mr. Carrico has written and prepared site-specific O&M manuals, site assessment and investigation reports, and routine project status reports. Mr. Carrico is also the Assistant Director of our OM&M Division.
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.
Contact Pete at 571-353-2034 or
Mr. 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.
Mr. Barham is SCS’s Senior Vice President of Construction Services. He is a licensed contractor in 15 states, a member of the Virginia and District of Columbia bars, and has served as an adjunct professor in the Department of Civil Engineering at the University of Maryland for over 30 years. 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 35 years of experience in the construction industry.
Mr. Barham is SCS’s Senior Vice President of Construction Services. He is a licensed contractor in 15 states, a member of the Virginia and District of Columbia bars, and has served as an adjunct professor in the Department of Civil Engineering at the University of Maryland for over 30 years. 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 35 years of experience in the construction industry.
Mr. Barham provides SCS Field Services with expertise in construction management, including procurement, scheduling, budgeting, and estimating, as well as other contract formation and administration activities.
Mr. Barham has directed several full service (design/build) projects and 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).
Prior to joining SCS Field Services, Mr. Barham served as a construction manager for a major general contractor on large hospital and institutional building construction projects.
Curtis Jang is a Senior Vice President and the Chief Financial Officer of SCS Engineers. He holds degrees in Economics and Liberal Arts and has over 30 years of experience, 15 years with SCS. He is a member of SCS’s Board of Directors and chairs the SCS ESOP/401(k) Contributions, ESOP Trustee Liaison, Strategic Planning, Stock Transaction, Disclosures, and Management Advisory Committees. As Chief Financial Officer, he is responsible for managing financial risks, financial planning and analytics, and oversight of Information Technology, Human Resources, and Health and Safety. His background includes experience in sourcing, negotiating, closing and integrating acquisitions. He has successfully closed and implemented seven acquisitions for SCS and several more with prior employers. In addition to Board representation inside of SCS, Curtis is a Leadership Advisory Board member for the Coalition for Renewable Natural Gas.
Curtis Jang is a Senior Vice President and the Chief Financial Officer of SCS Engineers. He holds degrees in Economics and Liberal Arts and has over 30 years of experience, 15 years with SCS. He is a member of SCS’s Board of Directors and chairs the SCS ESOP/401(k) Contributions, ESOP Trustee Liaison, Strategic Planning, Stock Transaction, Disclosures, and Management Advisory Committees. As Chief Financial Officer, he is responsible for managing financial risks, financial planning and analytics, and oversight of Information Technology, Human Resources, and Health and Safety. His background includes experience in sourcing, negotiating, closing and integrating acquisitions. He has successfully closed and implemented seven acquisitions for SCS and several more with prior employers. In addition to Board representation inside of SCS, Curtis is a Leadership Advisory Board member for the Coalition for Renewable Natural Gas.
Practice Areas
Mr. Jang’s key responsibilities include overseeing the financial development of the firm and its subsidiaries, analytical review of financial results including key metrics, overseeing financial audits, overseeing preparation of corporate tax returns, examining methods for reducing the company’s tax burden, managing cash flow improvement strategies, developing and executing the firm’s mergers and acquisition strategic initiative, active role in the development and approval of the firm’s IT strategic initiatives, annual budgeting, overseeing the annual benefits package renewals, monitoring and developing solutions to human resources and employment issues.
His career as a finance and accounting executive spans 20 years and encompasses finance, strategic planning, risk management/surety, information technology, and human resources.
Steve Hamilton, REP, is a Senior Vice President and co-leads our SCS Energy Business Unit, which designs, builds, and operates biogas — primarily landfill gas (LFG) and digester-gas-to-energy projects.
SCS Energy has performed over 65 design or design/build biogas-to-energy projects and currently operates/maintains biogas-to-energy projects nationwide. The biogas end-uses include production of Renewable Natural Gas (RNG) from landfills and digesters for injection into natural gas pipelines, electric power generation (reciprocating internal combustion engines, turbines, microturbines, and fuel cells), production of biogas-derived compressed natural gas (CNG) for use as vehicle fuel, and direct-use of biogas in lieu of natural gas at industrial, utility, and institutional facilities.
Mr. Hamilton is a Senior Vice President and co-leads our SCS Energy Business Unit, which designs, builds, and operates biogas — primarily landfill gas (LFG) and digester-gas-to-energy projects.
He has over three decades of environmental project experience, with particular emphasis in solid waste management. Mr. Hamilton’s project experience ranges from hands-on participation in field and design work to direction of solid waste management projects. This work has involved over 700 projects on more than 350 sites throughout the United States and in Argentina, Brazil, Canada, Chile, China, Colombia, El Salvador, Egypt, India, Jamaica, México, Panama, Poland, and Puerto Rico. His project responsibilities have included solid waste planning; solid waste privatization; landfill siting, design, and operations and closure permits and plans; landfill contamination assessments and remedial actions; landfill leachate monitoring and treatment system design; landfill groundwater and landfill gas (LFG) monitoring programs; landfill Clean Air Act (CAA) permitting and compliance; LFG Clean Development Mechanism (CDM) projects, digester gas and LFG-to-energy (LFGE) recovery feasibility due diligence, studies, and investigations; and the testing, design, installation, and operation of digester gas and LFGE facilities, and LFG migration and emission control systems.
SCS Energy has performed over 65 design or design/build biogas-to-energy projects and currently operates/maintains biogas-to-energy projects nationwide. The biogas end-uses include production of Renewable Natural Gas (RNG) from landfills and digesters for injection into natural gas pipelines, electric power generation (reciprocating internal combustion engines, turbines, microturbines, and fuel cells), production of biogas-derived compressed natural gas (CNG) for use as vehicle fuel, and direct-use of biogas in lieu of natural gas at industrial, utility, and institutional facilities.
Mr. Hamilton has served as Director of SWANA’s Landfill Gas/Biogas Technical Division. He also served as Chair of SWANA’s Landfill Gas Training Program for over 10 years, and remains active in SWANA. He has extensive experience in providing solid waste training and education at numerous venues in the United States and abroad.
Contact Steve at 707-695-8543 or
Mr. Legaspi is a Senior Vice President and O&M Region Manager, West Region, responsible for the following counties in California: Orange County, San Bernardino County, Imperial County, and Riverside County. He is a Senior Project Manager with nearly 20 years of experience in planning, directing, and implementing landfill gas (LFG) and groundwater operation, maintenance, and monitoring (OM&M) and construction projects, particularly related to LFG and groundwater extraction and treatment systems.
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. He is a licensed Professional Engineer in Florida, Georgia, Alabama, North Carolina and Puerto Rico. Mr. Lebron is also Vice President of SCS Engineers Puerto Rico PC.
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. He is a licensed Professional Engineer in Florida, Georgia, Alabama, North Carolina and Puerto Rico. Mr. Lebron is also Vice President of SCS Engineers Puerto Rico PC.
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 all across the U.S. He has experience on more than 100 landfill gas projects, including evaluation, design, permitting, construction, operation. He has led a solid waste group that has experience in construction management and oversight of landfill and landfill gas collection systems, soil vapor extraction systems, and other solid waste construction projects. Mr. Lebron has extensive experience with Title V permitting and other regulatory requirements associated with landfill gas collection systems such as NSPS and NESHAP.
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 LFH 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 LFH 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.
Eddy Smith, PE, is Senior Vice President and Corporate Project Director. He previously served as the Business Unit Director for the 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 firms 2022 Strategic Plan and the Client Success initiative. He is a licensed Professional Engineer in Florida.
Eddy Smith, PE, is Senior Vice President and Corporate Project Director. He previously served 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 firms 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.
Mr. Mandeville is a Senior Vice President of SCS Engineers. His experience includes solid waste, storage tank, and other environmental service type projects, with more than 30 years of diversified experience in civil and geotechnical engineering includes design and management of large, complex projects for the private sector, local governments, and the federal government. Mr. Mandeville is a licensed Professional Engineer in Virginia, Maryland, the District of Columbia, and South Carolina. He is also a Class II Waste Management Facility Operator in Virginia and a Certified Value Engineer.
Mr. Mandeville is a Senior Vice President of SCS Engineers. His experience includes solid waste, storage tank, and other environmental service type projects, with more than 30 years of diversified experience in civil and geotechnical engineering includes design and management of large, complex projects for the private sector, local governments, and the federal government. Mr. Mandeville is a licensed Professional Engineer in Virginia, Maryland, the District of Columbia, and South Carolina. He is also a Class II Waste Management Facility Operator in Virginia and a Certified Value Engineer.
Mr. Mandeville served as SCS Engineer’s Business Unit Director of the Mid-Atlantic region, stretching from Maine to South Carolina, for over 20 years.
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.
Mr. Nuno is a Senior Vice President of SCS with over 30 years of experience. He is responsible for Environmental Services in California and Nevada, and manages our Long Beach headquarters office.
Mr. Nuno is a Senior Vice President of SCS and is responsible for Environmental Services in California and Nevada, and manages our Long Beach headquarters office. He has over 30 years of environmental services experience, all with SCS, and extensive expertise in property evaluation and due diligence; site assessment, investigation, and remediation; underground storage tank (UST) assessment, upgrading, removal, and leakage cleanup; and hazardous waste management. He works extensively with regulatory agencies, fully understands regulations pertaining to petroleum hydrocarbons and hazardous waste, and has worked on numerous projects associated with real estate transactions to assess the potential for releases, characterize releases of contaminants to soil, soil vapor, and groundwater, implement remedial measures, and develop cost estimates for assessing and mitigating impacts. An SCS Vice President responsible for Environmental Services in Southern California and Nevada, Mr. Nuno has directed SCS’s contributions to a number of major projects, including construction of the Staples Center and the Phoenix Award-winning Chesterfield Square project, both in Los Angeles, CA.
