Staff

Ms. Coelho is a Sustainable Materials Management (SMM) Specialist with a passion for organics programs. She has several years of experience in the solid waste industry as a Zero Waste Program Coordinator and Environmental Programs Consultant, specifically working with municipalities.

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    • Ms. Coelho is a Sustainable Materials Management (SMM) Specialist with a passion for organics programs. She has several years of experience in the solid waste industry as a Zero Waste Program Coordinator and Environmental Programs Consultant, specifically working with municipalities.
      Ms. Coelho previously worked for the City of Santa Clara, Department of Public Works, and the City of Sunnyvale, Environmental Services Department, where she provided extensive technical assistance to single-family residential customers, schools, restaurants, and commercial business customers.

Ms. Collier is a Senior Project Professional in our Des Moines, Iowa, office. She has over 18 years of experience in the Iowa solid waste industry. She has spent most of her career as both a client and project manager working directly with clients to ensure their projects were being completed on schedule and within budget. Her focus has been on working as a member of the client’s team as an advocate for their best interest. Through her career she has become proficient in Iowa solid waste regulations and compliance requirements. She has BS and MS degrees from Iowa State University in Civil Engineering with an environmental emphasis, and is a licensed Iowa Professional Engineer.

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    • Ms. Collier is a Senior Project Professional in our Des Moines, Iowa, office. She has over 18 years of experience in the Iowa solid waste industry. She has spent most of her career as both a client and project manager working directly with clients to ensure their projects were being completed on schedule and within budget. Her focus has been on working as a member of the client’s team as an advocate for their best interest. Through her career she has become proficient in Iowa solid waste regulations and compliance requirements. She has BS and MS degrees from Iowa State University in Civil Engineering with an environmental emphasis, and is a licensed Iowa Professional Engineer.

Tom Conrad, PE, is a founding principal of SCS Engineers and our Director Emeritus. He is experienced in civil and environmental engineering, construction, and energy management. His environmental engineering experience has been in waste management, with the vast majority in solid waste.

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    • Practice Areas
      Mr. Conrad has decades of experience in the environmental engineering industry, specifically in solid waste management, including landfills; landfill gas (LFG) control; LFG to Energy; leachate management; solid waste management, recycling, and sustainability plans; waste conversion technologies; yard waste composting; material recovery facilities; and transfer stations.
      His energy management experience includes serving as the program manager on SCS’s GSA energy schedule contract and blanket purchase agreements (BPAs) for GSA and the National Park Service, performing energy and water audits, and conducting retro-commissioning.

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Samuel Cooke
Vice President//National Expert on Liquids Management
Madison, WI
National Expert: Energy Management; Industria... +
O. (608) 216-7382

Mr. Cooke, PE, CEM, MBA, is a Vice President and our expert on Industrial Waste Pretreatment. He has nearly three decades of professional and project management experience in engineering with a concentration in environmental and energy engineering. Mr. Cooke works within SCS’s Liquids Management initiative to provide services to our clients nationwide.

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    • Mr. Cooke, PE, CEM, MBA, is a Vice President and our expert on Industrial Waste Pretreatment. He has nearly three decades of professional and project management experience in engineering with a concentration in environmental and energy engineering. Mr. Cooke works within SCS’s Liquids Management initiative to provide services to our clients nationwide.
      Mr. Cooke’s background as a long-time business owner adds to his perspective of emphasis on client profitability and proactive project communications.
      Mr. Cooke is a licensed professional engineer in Wisconsin, Illinois, Indiana and Colorado. He earned a bachelor of science in chemical engineering, a master’s of business administration and is a Certified Energy Manager through the Association of Energy Engineers.
      Practice Areas
      Mr. Cooke’s primary areas of technical expertise include liquids management, building and industrial facility energy management, regulatory compliance and energy management, retro-commissioning, environmental assessments and audits, energy engineering, process/design engineering, site investigation and remediation, water and wastewater treatment, aboveground and underground storage tanks, and spill prevention, control, and countermeasures.
      Mr. Cooke has managed over 1,000 projects in 31 states with many industrial, manufacturing, government agency, and corporate clients.
      Contact Sam at 608-216-7382 or

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Mr. Cooper has been involved in all aspects of landfill and landfill gas projects including design, permitting, and construction. These projects range in scope from annual Landfill gas (LFG) Gas Collection and Control System (GCCS) expansions to permitting of new LFG Electrical Generators.

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    • Mr. Cooper has been involved in all aspects of landfill and landfill gas projects including design, permitting, and construction. These projects range in scope from annual Landfill gas (LFG) Gas Collection and Control System (GCCS) expansions to permitting of new LFG Electrical Generators. Mr. Cooper has also provided engineering, project management and client support for stormwater water management, landfill scalehouse design, transfer station design, pump station design and hurricane debris management projects. He is currently a Project Director with SCS and leader of the Tampa LFG practice which focuses on LFG Gas Collection and Control System (GCCS) design, permitting, Title V compliance and GCCS construction CQA. Mr. Cooper oversees the LFG group, which performs all compliance reporting for Title V NSPS as well as greenhouse gasses for public and private landfills throughout the southeast. The Tampa LFG group regularly designs, permits and oversees the construction on new and expanded GCCS for the entire Southeast U.S.

Mr. Cooper is a Vice President with over 30 years of experience in landfill gas (LFG) control and recovery, emissions monitoring, and environmental compliance reporting. He is responsible for field supervision and implementation of environmental gas testing, monitoring, and construction projects.

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    • Mr. Cooper is a Vice President with over 30 years of experience in landfill gas (LFG) control and recovery, emissions monitoring, and environmental compliance reporting. He is responsible for field supervision and implementation of environmental gas testing, monitoring, and construction projects.

Mr. Cortez has 31 years of landfill construction and Operations, Maintenance, and Monitoring (OM&M) experience. He has served as field engineer and project superintendent on landfill cell construction, design, excavation, and all levels of landfill gas (LFG) system operations and maintenance (O&M). Mr. Cortez has managed multi-site contracts, subcontractors, and field crews for over 20 years. He holds numerous specialty certifications that bring value to OM&M or construction projects. He has Superfund experience dating back to the 1980s. He has worked with cogen operators at dozens of sites to ensure gas quality and quantity, while keeping systems compliant, and can help operators avoid impacts to ongoing operations.

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    • Mr. Cortez has 31 years of landfill construction and Operations, Maintenance, and Monitoring (OM&M) experience. He has served as field engineer and project superintendent on landfill cell construction, design, excavation, and all levels of landfill gas (LFG) system operations and maintenance (O&M). Mr. Cortez has managed multi-site contracts, subcontractors, and field crews for over 20 years. He holds numerous specialty certifications that bring value to OM&M or construction projects. He has Superfund experience dating back to the 1980s. He has worked with cogen operators at dozens of sites to ensure gas quality and quantity, while keeping systems compliant, and can help operators avoid impacts to ongoing operations.

Mr. Cotter is a Vice President, Project Director, and serves as the SCS Kansas City Office Manager where he is responsible for managing the technical and support personnel and the office’s financial performance and business development efforts. Mr. Cotter specializes in solid waste management projects; his exerience involves all areas of solid waste management including planning, permitting, transportation, landfill design, construction, and monitoring. Mr. Cotter is also experienced in general civil engineering, construction oversight, environmental site assessments, closure and post-closure plans, and permit and contract document preparation. He is a licensed Professional Engineer in Arkansas, Illinois, Kansas, Missouri, and Oklahoma.

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    • Mr. Cotter is a Vice President, Project Director, and serves as the SCS Kansas City Office Manager where he is responsible for managing the technical and support personnel and the office’s financial performance and business development efforts. Mr. Cotter specializes in solid waste management projects; his exerience involves all areas of solid waste management including planning, permitting, transportation, landfill design, construction, and monitoring. Mr. Cotter is also experienced in general civil engineering, construction oversight, environmental site assessments, closure and post-closure plans, and permit and contract document preparation. He is a licensed Professional Engineer in Arkansas, Illinois, Kansas, Missouri, and Oklahoma. In addition, Mr. Cotter has experience with environmental due diligence consulting as it relates to landfill acquisitions and other real estate purchases.

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Mr. Craig is a Project Manager with a diverse background in environmental consulting. His experience includes environmental program and project management, environmental sampling (groundwater, soil, air and building materials), environmental assessments, site and facility inspections, project safety audits and inspections, data collection from a variety of remedial systems (AS/VE, groundwater recirculation, groundwater extraction, chemical/amendments injection, and landfill gas collection), emergency response, soil excavations and source removals, remediation system installation, operations and maintenance (O&M), well installation oversight, and business development and marketing.

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    • Mr. Craig is a Project Manager with a diverse background in environmental consulting. His experience includes environmental program and project management, environmental sampling (groundwater, soil, air and building materials), environmental assessments, site and facility inspections, project safety audits and inspections, data collection from a variety of remedial systems (AS/VE, groundwater recirculation, groundwater extraction, chemical/amendments injection, and landfill gas collection), emergency response, soil excavations and source removals, remediation system installation, operations and maintenance (O&M), well installation oversight, and business development and marketing.

Mr. Croasdale is a Project Manager in our Operations, Maintenance, and Monitoring (OM&M) Division. He has over 15 years of experience in landfill gas (LFG) system operations monitoring, maintenance, migration control and recovery projects, and NSPS compliance. Field responsibilities have included routine testing, monitoring, and maintenance; repair of LFG collection headers, pneumatic pumps, extraction wells, and blower/flare facilities. Mr. Croasdale also performs non-routine troubleshooting and repairs as well as emergency response services.

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    • Mr. Croasdale is a Project Manager in our Operations, Maintenance, and Monitoring (OM&M) Division. He has over 15 years of experience in landfill gas (LFG) system operations monitoring, maintenance, migration control and recovery projects, and NSPS compliance. Field responsibilities have included routine testing, monitoring, and maintenance; repair of LFG collection headers, pneumatic pumps, extraction wells, and blower/flare facilities. Mr. Croasdale also performs non-routine troubleshooting and repairs as well as emergency response services.
      As the Sub-region Manager, Mr. Croasdale is routinely involved with work scope implementation, scheduling of field technicians, data review, interpretation, and assessment and coordination with the Engineers. Responsibilities have included, report preparation and review, Health & Safety Plan preparation and implementation, and providing support in regulatory compliance; i.e., compliance with Clean Air Act requirements and off-site migration regulations.
      Mr. Croasdale construction background includes installation and startup of blowers, flares, pumps, and compressors. These experiences have included both construction of new and expanded systems and repair and renovation of existing systems.

Mr. Crosby has ten years of professional experience as a scientist in the environmental consulting field. He successfully manages complex environmental site assessments, subsurface investigations, and remediation projects to navigate regulatory requirements and meet client objectives.

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    • Mr. Crosby has ten years of professional experience as a scientist in the environmental consulting field. He successfully manages complex environmental site assessments, subsurface investigations, and remediation projects to navigate regulatory requirements and meet client objectives. He has experience investigating and remediating properties that have soil and groundwater impacted by a variety of constituents of concern including petroleum hydrocarbons, chlorinated solvents, volatile organic compounds, pesticides, lead, and other heavy metals. He routinely prepares technical environmental documents that clearly describe environmental conditions and meet regulatory agency compliance including workplans, property mitigation plans, soil management plans, corrective action plans, remedial action plans, site assessment reports, groundwater monitoring reports, health risk assessments, and property closure reports. He has experience managing groundwater monitoring programs, drilling operations, soil vapor surveys, remediation, and construction oversight. He has implemented remedial action work plans that include source zone excavation, dual phase extraction, soil vapor extraction, in-situ chemical oxidation, bio-augmentation, and air sparging techniques. He has provided construction quality assurance at landfill facilities and oversight of brownfield redevelopment excavation and grading projects.

Mr. Cuevas is a Senior Project Professional with our SCS Tracer Environmental division. He is experienced in risk analysis, and is responsible for the documentation of Process Safety Management Programs (PSM), Risk Management Programs (RMP), and California Accidental Release Prevention (CalARP) Programs for facilities using regulated substances.

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    • Mr. Cuevas is a Senior Project Professional with our SCS Tracer Environmental division. He is experienced in risk analysis, and is responsible for the documentation of Process Safety Management Programs (PSM), Risk Management Programs (RMP), and California Accidental Release Prevention (CalARP) Programs for facilities using regulated substances. This work includes preparing all necessary documentation for compliance with the PSM/RMP/CalARP regulation, developing the Piping and Instrumentation Diagrams, and modeling the potential off-site consequences of potential releases.

Mr. Curtis has more than 30 years of experience designing, permitting, managing, and overseeing construction of civil and environmental projects for both public and private clients. He specializes in creating detailed designs for landfill development and closure, landfill gas collection and conveyance systems, stormwater management and erosion control plans, and management of remedial action projects. He is also experienced in horizontal and vertical expansions, and the closure and remediation of existing facilities. Mr. Curtis has also worked with a variety of waste streams that range from low-strength industrial waste and sludges to municipal solid waste (MSW) and construction and demolition debris (CDD).

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    • Mr. Curtis has more than 30 years of experience designing, permitting, managing, and overseeing construction of civil and environmental projects for both public and private clients. He specializes in creating detailed designs for landfill development and closure, landfill gas collection and conveyance systems, stormwater management and erosion control plans, and management of remedial action projects. He is also experienced in horizontal and vertical expansions, and the closure and remediation of existing facilities. Mr. Curtis has also worked with a variety of waste streams that range from low-strength industrial waste and sludges to municipal solid waste (MSW) and construction and demolition debris (CDD).

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Ms. Dahi is a Project Professional in SCS’s Energy Division. She has more than 15 years of experience in downstream/upstream of the oil and gas industry, refineries, renewable natural gas, petrochemicals, infra-structure, utilities, water and wastewater treatment industries and safety. She has experience both as a team member and as the head of teams of EPC and front-end engineering (FEED) development on several plants.

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    • Ms. Dahi is a Project Professional in SCS’s Energy Division. She has more than 15 years of experience in downstream/upstream of the oil and gas industry, refineries, renewable natural gas, petrochemicals, infra-structure, utilities, water and wastewater treatment industries and safety. She has experience both as a team member and as the head of teams of EPC and front-end engineering (FEED) development on several plants.

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Mr. Davis is an Amoonia Refrigeration Advisor for our Tracer Environmental division.

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    • Mr. Davis is an Amoonia Refrigeration Advisor for our Tracer Environmental division.

Mr. de la Lama is a Vice President and Regional Construction Manager for SCS Field Services. He has over 35 years of construction management and leadership experience. He has extensive qualifications in estimating, planning, and delivering civil projects, including landfill gas and landfill gas to energy projects.

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    • Mr. de la Lama is a Vice President and Regional Construction Manager for SCS Field Services. He has over 35 years of construction management and leadership experience. He has extensive qualifications in estimating, planning, and delivering civil projects, including landfill gas and landfill gas to energy projects.

Mr. DeGayner is a Senior Project Professional with the Sustainable Materials Management division, and provides environmental support for projects performed out of the SCS Reston, Virginia office. His experience includes field investigations and project management to support solid waste management and recycling studies as well as other environmental projects.

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    • Mr. DeGayner is a Senior Project Professional with the Sustainable Materials Management division, and provides environmental support for projects performed out of the SCS Reston, Virginia office. His experience includes field investigations and project management to support solid waste management and recycling studies as well as other environmental projects.

Ms. DeLong is a Project Professional with experience in greenhouse gas (GHG) emissions, sustainable energy, and climate dynamics. She specializes in air quality consulting and has been involved in numerous projects related to air permitting and compliance with solid waste regulations, including preparing Title V and Non-Title V permit-to-construct/operate permit applications. She also prepares compliance reports, which involves conducting a thorough review of facility records and data, and analyzing permits and local, state, and federal regulations.

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    • Ms. DeLong is a Project Professional with experience in greenhouse gas (GHG) emissions, sustainable energy, and climate dynamics. She specializes in air quality consulting and has been involved in numerous projects related to air permitting and compliance with solid waste regulations, including preparing Title V and Non-Title V permit-to-construct/operate permit applications. She also prepares compliance reports, which involves conducting a thorough review of facility records and data, and analyzing permits and local, state, and federal regulations.
      Ms. DeLong has completed multiple emission estimates and inventories that include criteria air pollutants, toxic air contaminants, and GHG emissions. She also evaluates and calculates landfill gas (LFG) flow data in order to prepare federal GHG reports, and California Assembly Bill (AB) 32 Mandatory Reports for several landfills
      Ms. DeLong is on SCS’s certified CARB GHG verification team, and calculates and analyzes data, attends site visits, and prepares verification reports in order to verify GHG emissions for various facilities in the electric power entities, stationary combustion, and oil and gas sectors.

Stacey Demers
Project Director/National Expert on Solid Waste Composition Studies
Reston, VA
National Expert: Solid Waste Composition Studies
O. (571) 353-2006

Ms. Demers, a LEED® Accredited Professional, is SCS’s National Expert on Solid Waste Composition studies. She has 27 years of experience in the environmental field, specializing in solid waste and energy.

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    • Ms. Demers, a LEED® Accredited Professional, is SCS’s National Expert on Solid Waste Composition Studies. She has 27 years of experience in the environmental field, specializing in solid waste and energy.
      Ms. Demers provides strong technical and analytical skills in planning, statistics, sample design for environmental programs, and modeling. Projects include program assessments, data analyses, database management, sampling protocols and associated field sampling specific to sustainability metrics. She is also the director of the Sustainable Materials Management Technical Division of the Solid Waste Association of North America.
      Contact Stacey at 571-353-2006 or

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Mr. Descher is a Senior Project Professional with 14 years of solid waste experience, mostly in environmental compliance. He has experience in many aspects of solid waste and environmental compliance, including Title V permitting, monitoring and reporting, data management, groundwater, NPDES and other environmental monitoring, environmental compliance auditing of solid waste facilities, landfill cell construction, landfill cell closure, gas extraction system construction, as well as some experience with ash pond management and closure.

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    • Mr. Descher is a Senior Project Professional with 14 years of solid waste experience, specializing in environmental compliance. He has experience in many aspects of solid waste and environmental compliance, including Title V permitting, monitoring and reporting, data management, groundwater, NPDES and other environmental monitoring, environmental compliance auditing of solid waste facilities, landfill cell construction, landfill cell closure, gas extraction system construction, as well as some experience with ash pond management and closure.
      Projects typically have involved permitting, reporting, compliance tracking, regulatory agency liason, and environmental sampling. Facilities have included landfills, landfill gas control facilities, material recovery facilities, transfer stations, power plants, and various other manufacturing and distribution facilities.

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Dr. DeVries has experience with a broad range of landfill projects including, permitting, facility design, GCCS expansions, regulatory compliance, research, and construction-related services, including CQA. He is a Registered Professional Engineer in Texas, and has a PhD in Civil Engineering.

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    • Dr. DeVries has experience with a broad range of landfill projects including, permitting, facility design, GCCS expansions, regulatory compliance, research, and construction-related services, including CQA. He is a Registered Professional Engineer in Texas, and has a PhD in Civil Engineering.

Bob Dick is a Senior Vice President of SCS Engineers. He is an experienced civil and environmental engineer with expertise in solid and hazardous waste management. He manages SCS’s operations in the Richmond, Virginia office. Mr. Dick has performed landfill and landfill gas engineering projects in more than 15 states and several foreign countries. He is a licensed Professional Engineer in Virginia and North Carolina.

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    • Bob Dick is a Senior Vice President of SCS Engineers. He is an experienced civil and environmental engineer with expertise in solid and hazardous waste management. He manages SCS’s operations in the Richmond, Virginia office. Mr. Dick has performed landfill and landfill gas engineering projects in more than 15 states and several foreign countries. He is a licensed Professional Engineer in Virginia and North Carolina.
      He has worked on numerous major landfill multi-task assignments involving new landfill cell construction, vertical and lateral expansion, closure, post-closure care, groundwater monitoring, phasing operations, and financial assurance, and has performed over 150 landfill gas projects involving landfill gas migration control, odor control, emissions control and Clean Air Act compliance, energy recovery/utilization, and carbon credit monetization. Other project assignments have involved work related to material recovery facility permitting and operations, solid waste management planning, air permitting at industrial facilities, stormwater management, storage tanks, brownfields projects, and wetlands.

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Mr. Dieleman is a Senior Project Professional with SCS Engineer’s Sustainable Materials Management Division in Reston, Virginia. Project activities include field sampling, technical assistance, program analysis, program and industry research, consensus building, data analysis, and database management.

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    • Mr. Dieleman is a Senior Project Professional with SCS Engineer’s Sustainable Materials Management Division in Reston, Virginia. Project activities include field sampling, technical assistance, program analysis, program and industry research, consensus building, data analysis, and database management. Mr. Dieleman has 12 years of experience in the solid waste and energy field.

Mr. Dietch is a Project Director in our Miami, FL, office. He is responsible for developing the Sustainable Materials Management Practice for SCS’s Southeast Region and works closely with SCS’s national experts to support our regional clients.  Since joining SCS in 2018, he has completed a wide range of solid waste and environmental projects for municipal and private clients. He has a Bachelor’s degree in Geology (with an Archeology minor), and an MBA in Management.

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    • As a Project Director based in Miami, FL, Mr. Dietch is responsible for developing SCS’s Southeast Regions’ Sustainable Materials Management Practice and works closely with SCS’s national experts to support our regional clients.  Since joining SCS in 2018, he has completed a wide range of solid waste and environmental projects for municipal and private clients. He has a Bachelor’s degree in Geology (with an Archeology minor), and an MBA in Management.
      Mr. Dietch has more than 20 years of academic and professional experience in solid waste management. He uses this experience to provide clients with strategic solid waste consulting, including solid waste and recycling planning, landfill gas project development, operations monitoring, procurements, litigation support, rate structure/alternative financing analyses, ordinance development, and contract negotiations. His responsibilities include program coordination, planning, execution, and client liaison. Work products include master/strategic plans, landfill closure plans, operations reports, technology reports, rate models and reports, contracts, ordinances, benefit/cost analyses, customized data management systems, and procurement documents.
      In addition, Mr. Dietch specializes in developing and managing composting projects. His experience includes on-farm composting, where he has assisted with the development and operation of a turned windrow system, and institutional and municipal composting projects, where he has managed the development and operations of a proprietary in-vessel compost system. For composting projects, he has successfully processed a variety of waste streams, including municipal solid waste, sewage sludge, agricultural, paper and yard wastes, and pre- and post-plate food scraps. In addition to development and management, Mr. Dietch has been responsible for equipment assessment, prototype construction, permitting, and onsite operations.

Dr. Dillah serves as a vice president of SCS Engineers and heads up its LFG/Engineering Group in the Reston Virginia office. His group works on a variety of environmental engineering design projects ranging from leachate, landfill gas and landfills to transfer station and biogas energy plants. He has over 27 years of experience in the environmental engineering field, including solid waste designs, lecturing and research, feasibility studies, environmental assessments, economic analysis, construction oversight and management, health and safety implementation, and operation and maintenance.

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    • Dr. Dillah serves as a vice president of SCS Engineers and heads up its LFG/Engineering Group in the Reston Virginia office. His group works on a variety of environmental engineering design projects ranging from leachate, landfill gas and landfills to transfer station and biogas energy plants. He has over 27 years of experience in the environmental engineering field, including solid waste designs, lecturing and research, feasibility studies, environmental assessments, economic analysis, construction oversight and management, health and safety implementation, and operation and maintenance.

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