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John Merrill

Overview of Air Quality Management and Air Pollution Control

2026-09-11T10:09:08-06:00November 12th, 2014|Tags: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |

Government regulations for air quality and emissions continue to rapidly evolve. Companies must understand, plan for, and adhere to rapidly changing requirements including monitoring, testing, emissions control, recordkeeping, and reporting. Attaining and maintaining compliance while minimizing operational and financial impacts can be a challenge, particularly in today’s regulatory climate. Geosyntec's comprehensive understanding of air quality laws and regulations, along with our expertise in state-of-the-practice emissions control and monitoring technologies, equip us to provide our clients with innovative and cost-effective solutions for their air quality compliance challenges. Our practitioners offer clients a broad array of services, including permitting, compliance reporting, and air pollution control technology selection and optimization. Our projects routinely involve minor and major source air permitting, compliance assistance, and regulatory negotiations, as well as air pollution control equipment troubleshooting, optimization, and testing. Air Permitting On behalf of clients, we create unique solutions that often help them avoid major source permitting requirements, like Prevention of Significant Deterioration (PSD) or nonattainment area New Source Review (NSR). Relying on our extensive knowledge of operating permit programs and our experience in a broad range of industries and emissions sources, we offer clients permitting assistance that aligns with federal, state, and local air jurisdictions. We craft strategic approaches to air quality challenges. When major source permitting cannot be avoided, our air dispersion modelers and control technology experts know how to respond to challenges associated with major source permitting requirements. Geosyntec’s experts address control technology evaluations, including Best Available Control Technology (BACT) and Lowest Achievable Emission Rate (LAER) evaluations. They are also adept at understanding and conducting ambient air impact analyses, like National Ambient Air Quality Standards (NAAQS), Prevention of Significant Deterioration (PSD) increments, and state toxic air pollutant (TAP) demonstrations. Air Compliance and Reporting With federal, state, and local air quality regulations constantly in flux, maintaining compliance can be a burden on businesses. Our nuanced understanding of policies, regulations, and drivers empowers us to craft effective and efficient compliance solutions for our clients to help them address challenges and remain in compliance. Together, we develop frameworks for comprehensive environmental management strategies that help clients meet air compliance and reporting requirements. Some of the compliance programs we helped design include those governing emission inventory reporting; Title V annual and semiannual reporting; greenhouse gas (GHG) reporting; and deviation reporting. Evaluation and Optimization of Air Quality Control Devices Our practitioners evaluate air pollution control devices and advise clients to help them meet emission standards and minimize operational costs. Our project experience includes combustion management and tuning for boilers, thermal oxidizers, and other combustion devices. We also specialize in area and source measurement of complex pollutants such as mercury, sulfur trioxide (SO3) and per- and polyfluoroalkyl substances (PFAS), Geosyntec has installed state-of-the-practice hardware and software using cross-duct lasers to continuously monitor ammonia (NH3) and SO3. In addition, we can assist clients with selection of continuous emission monitoring systems (CEMS) and offer operational assistance, data management, and equipment maintenance. Continuous Emission Monitoring System Design and Ambient Air Monitoring Geosyntec has supported clients with development of comprehensive environmental management strategies, optimization of plant operations, and increasing efficiency of their air emissions control systems. This has included installation, evaluation, and enhancement of CEMS at point sources and ambient air monitoring systems for fence line or offsite monitoring. Air Litigation Support Leading law firms throughout the United States seek technical support from Geosyntec due to our expertise and credibility providing litigation support. Geosyntec provides resources for attorneys to advocate for their clients’ interests on a myriad of air subjects related to business transactions, environmental management, compliance and enforcement, toxic tort, and general litigation topics. Geosyntec’s team of senior air professionals frequently provide expert witness testimony opinion reports, claims assessments, and agency negotiations and settlement support. Advancing the State of the Practice Experts in process and air pollution control technology design, we help clients develop strategic approaches to complex, multipollutant emission issues and provide clients with a balanced approach to plant operations. In the electric power industry, Geosyntec practitioners design strategies that reduce the amount of coal required to produce energy through improvements in fuel use, waste generation systems, and air pollution controls. Optimal air pollution controls, such as selective catalytic reduction (SCR, or thermal oxidizers), can result in substantial fuel savings and decrease emissions through improved performance of control devices. Geosyntec practitioners frequently collaborate with colleagues and industry peers at the USEPA, the US Department of Energy (DOE), the Electric Power Research Institute (EPRI), the Air and Waste Management Association (AWMA), and other organizations on new strategies for reducing air quality impacts. These collaborate strategies involve NOx control, mercury capture, scrubber optimization for heavy metals, catalyst selection and optimization, and plume opacity mitigation. In addition, our experts have developed methods to measure emissions of specific pollutants under complex operating conditions which have been accepted by air agencies across the country. Representative Services Air Permitting for New Facilities and Facility Expansions Air Pollution Control Engineering Ambient Air Monitoring and Source Testing Program Support Air Dispersion Modeling, Accidental Release, and Computational Fluid Dynamics (CFD) Modeling Carbon Management and Greenhouse Gas Inventories Compliance Reporting and Auditing Services Capital Project Permitting Assessments Emission Inventories and Mobile Source Studies Feedstock Testing Analyses to maximize Air Pollution Source Control Health Risk Assessments Indoor Air Quality Monitoring and Management Litigation Support and Expert Witness Testimony Odor and Noise Modeling, Monitoring, and Control Operator and Employee Training Process Engineering and Controls Optimization Regulatory Strategy and Compliance Management Strategic Technical Support to Trade Associations

Overview of Building Health Evaluations and Rehabilitation

2026-04-21T09:36:22-06:00November 12th, 2014|Tags: , , , , , , , , , , , |

Geosyntec provides quality assessment services to aid building owners, employers, and government agencies as they identify, diagnose, and solve occupant health problems associated with the built environment. Our certified industrial hygienists and toxicologists conduct scientific assessments and work alongside our construction services professionals to develop project-specific solutions to address a wide range of human health, exposure, and causation matters ranging from combustion products to Legionnaires’ Disease and mold. Through our additional services in product and material testing and risk communication support, we can provide a holistic approach to our clients needs that address every aspect of their building health issues from initial assessment of the building and communicating the risk to occupants, to controlling or eliminating the problem.

Overview of Contaminated Site Assessment and Cleanup

2026-08-18T14:34:36-06:00November 12th, 2014|Tags: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |

Geosyntec practitioners rank among the world's top professionals in providing site assessment and remediation services at a wide range of impacted sites using innovative technologies and solutions that consistently advance the state of the practice. Through our use of innovative technologies and solutions, we provide our public and private sector clients with a wide array of services to address their toughest challenges. Our contaminated site practitioners guide our clients through a specialized remediation plan, consult on regulatory strategies, and develop a comprehensive cleanup approach. We can address numerous types of media, including contaminated soils, sediments, and groundwater. Advancing the State of the Practice Geosyntec's practitioners are pioneers in site assessment and remediation. Our senior practitioners have developed and authored guidance material and courses for local, state, and national agencies and associations on remediation techniques and technologies. Working with the Interstate Technical Regulatory Council, Geosyntec practitioners taught a training course on vapor intrusion, including mitigation options for the development of vapor-impacted brownfield sites. Geosyntec practitioners also wrote the guidance document on evaluating, optimizing, or ending post-closure care at impacted sites, including brownfield sites, and developed a patented approach for sub-slab vapor migration mitigation allowing residential, commercial, and industrial development on sites impacted by vapor intrusion. Our specialists routinely collaborate with prominent national researchers from academia and government agencies to provide innovative and defensible strategies for sites with contaminated sediments. For example, we collaborated with the United States Geological Survey (USGS) to remediate chlorinated solvent-contaminated marsh sediments by applying a bioreactive mat system embedded with a dehalogenating microbial consortium, a technology Geosyntec helped develop. This project and partnership earned our client recognition as a finalist for the Service to America Medal awarded by the Partnership for Public Service. Through a collaborative research project with the University of Florida, Geosyntec professionals helped develop the FLUCL software package for the Florida Department of Environmental Protection. This software is used to calculate exposure point concentration statistics in risk assessment and was the first of its kind to contain algorithms for censored datasets. FLUCL has received endorsements from several United States Environmental Protection Agency regions and the California Environmental Protection Agency. Geosyntec scientists also pioneered the use of genetic molecular tools to characterize microbes in environmental media and are engaged in applied research and development with top academic institutions around the world, including the University of Toronto, Cornell University, and the Georgia Institute of Technology.

Contaminated Media Investigations & Assessments

2026-09-24T10:14:27-06:00March 27th, 2014|Tags: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |

Geosyntec applies reliable and innovative approaches to contaminated media investigations and assessments. We help clients address a wide array of known and emerging contaminants in soil, sediment, and groundwater. We also conduct site evaluations and discover the sources of air emissions, subsurface vapor intrusion into buildings, and contaminants in surface waters. Our assessment specialists include some of the most respected and sought-after professionals in the environmental remediation industry. They possess the experience and technical skills to conceptualize and implement all aspects of contaminated media assessments and remediation programs. Using a multidisciplinary approach, Geosyntec brings together nationally recognized, in-house specialists in civil and geotechnical engineering, ecology and biological sciences, risk assessment and applied toxicology, and earth sciences to address the complex issues associated with contaminated media. Our contaminated site practitioners guide our clients through specialized remediation plans, consult on regulatory strategies, and develop comprehensive cleanup approaches. We address numerous types of media, including contaminated soil, sediment, and groundwater. Contaminated Media Services

Remedial Design

2026-06-30T09:17:15-06:00March 27th, 2014|Tags: , , , , , , , , , , , , , , , , , , , , , , , |

Geosyntec is a preferred partner for innovative, cost-effective, and successful remediation solutions because we approach each project with technical expertise and creativity. For every client, we develop a clear understanding of how to achieve best-value outcomes using the most appropriate technologies and management strategies for individual projects. When the nature of the problem, like an emerging contaminant, requires a new type of remedy, our professionals set the standard for developing innovative science into novel and effective solutions for environmental remediation. From advanced vapor intrusion evaluation strategies to sophisticated bioaugmentation techniques and beyond, Geosyntec delivers practical environmental management solutions that meet project-specific needs and achieve our clients' objectives. Along with our expertise in treatability and pilot tests, Geosyntec practitioners are adept at conducting feasibility studies that develop, screen, and provide detailed evaluations of alternative remedial solutions for impacted sites. Our studies help clients determine the optimum performance they can expect from a remediation system and the expected cost of implementing a remedy. We also provide detailed remediation system design and design/build services for a wide range of innovative and traditional remediation strategies, including those that employ groundwater pump and treat systems; bioremediation and bioaugmentation solutions; chemical oxidation; the injection of nanoscale zero-valent iron; soil vapor extraction; indoor air venting and treatment; and much more. Geosyntec applies the principles of future optimization at the forefront of the design process, positioning the client for long-term savings opportunities, with strategies like modular unit operations of an ex situ treatment train to reduce chemical and energy costs as influent concentrations decrease, or incorporating flexibility into injection systems such as allowing for alternating passive and active flow fields or the ability to add additional components to target residual source zones. Geosyntec is the leading provider of remedial design services, particularly for complex sites where the challenges – whether from unconventional contaminants, difficult geology and site setting, multi-party groups of responsible parties, or all of the above – make the exit strategy difficult to envision. Our collaborative, global network provides our clients with access to the most talented group of environmentally-focused professionals in the industry. We also approach every project as a time-critical action, recognizing that when our clients require remediation services, they should expect to see the positive results of those actions in a timely manner.

Treatability & Pilot Studies

2026-04-29T11:45:40-06:00March 27th, 2014|Tags: , , , , , , , , , , , , , , , , , , , , |

Geosyntec provides treatability testing services to support a wide variety of environmental remediation projects around the world. The results of our studies and pilot tests provide important, actionable data about environmental challenges presented by contaminated soil, sediment, groundwater, surface water, and waste. Armed with accurate data on the impacts facing a given study area, our design engineers and our clients are better able to understand the physical, chemical, and biological processes present at a site that can help mitigate potential risks associated with contaminants in various media. The performance data produced by our treatability studies and pilot tests also allow Geosyntec to assess the applicability of specific remediation technologies or solutions under a variety of conditions present in a particular study area. The results of our studies are critical for understanding and demonstrating, for example, an attenuation process that can occur in sediment if natural conditions are maintained at the site. The data may also demonstrate the potential results if cap material is placed on top of impacted sediment, or they may help us understand the potential benefits of adding enhancements to either the existing sediment or cap material. Treatability and pilot studies conducted by Geosyntec's engineers and scientists begin by determining the data quality objectives of an investigation and the most appropriate sources of the data. We then complete a thorough work plan for the study area that includes sampling and analysis plans for collecting the data and interpreting its results. This systematic approach to sample collection and analysis ensures we gather the most valuable, site-specific data necessary — data that, ultimately, aids in the screening, selection, and implementation of remediation technology or solutions for impacted sites regulated under local, state, and national criteria. Well-documented treatability studies are an important component of the contaminant removal process, for remedial investigation/feasibility studies, and the remedial design/remedial action process required under the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA). Our treatability studies and pilot tests also provide the detailed design, cost, and performance data needed to optimize treatment processes and to implement full-scale treatment systems. Additionally, Geosyntec's in-house laboratories provide physical and chemical testing that effectively monitors the performance of treatment processes, technologies, and systems. We also produce field application quantities of naturally occurring consortia of microorganisms that target specific recalcitrant compounds. Using genetic testing we can demonstrate the efficacy of these consortia in achieving containment reduction targets. Our technical evaluation facilities regularly conduct chemical oxidation and bioreactor tests; examine the presence of organics and inorganics in wastewater; evaluate the effectiveness of remediation products; simulate the performance of conceptual designs; and analyze the likely behavior and end point of various treatment processes. All of our lab teams communicate regularly to share knowledge and direct internal and external client projects to the most appropriate technology solutions.

Overview of Water and Natural Resources

2026-09-23T13:32:29-06:00November 30th, 2001|Tags: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |

Geosyntec's water and natural resources practice is a collaborative group of nationally recognized scientists and engineers dedicated to balancing built and natural environments. Their practice specialties represent many disciplines, including geomorphology, ecology, biology, statistics, construction management, computer science, and engineering. Our practitioners are at the forefront of policy analyses, regulatory compliance, and technology applications that promote sustainable water resources management and ecosystem restoration.

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