MEET OUR TEAM2018-07-03T09:18:59+00:00
William L. Ullom
William L. UllomFounder and President
Bill Ullom is President of Vadose Environmental Consultants in Akron, Ohio, helping people across the Nation avoid problems with EPA for 30 years. His is also Founder and Chief Technology Officer of Vadxx Energy of Cleveland, Ohio, benefiting the environment by converting non-recyclable plastic waste into renewable energy and petrochemical products from renewable and plentiful sources. Bill is one part scientist, one part businessman, one part inventor and two parts entrepreneur, understanding the needs of industry, purchasers and owners of real estate, commercial lenders, attorneys and regulatory agencies. Author and co-author of relevant ASTM Standards, Bill was a pioneer in modern methods of soil vapor monitoring, allowing Vadose to become a leader in vapor intrusion identification and corrective action. Under Bill’s direction, Vadose Environmental is set apart by seeking simple, novel and creative solutions to environmental challenges, creating value at every opportunity.

Bill can be reached at (330) 762-6706 or via email at

Carol J. Richardson
Carol J. RichardsonProject Manager
Carol Richardson serves as the Project Manager in the Akron, Ohio corporate office. With over twenty years of varied experience in the environmental industry, she works directly with the senior staff to help support their practice growth and development. She regularly serves as the liaison between clients and local, state and federal regulatory agencies. Her qualifications include oversight and management of small to large portfolios of multi-phased subsurface investigations, underground storage tank (UST) closures, state and federal corrective action activities, environmental site assessments (ESAs), and industrial hygiene investigations (asbestos, mold, and lead). For the petroleum industry, Carol oversees spill forensic services including but not limited to emergency response management and oversight. Her diverse experience also includes the performance of aquatic biologic investigation, permitting of commercial waste water systems and new air sources, as well as providing health and safety oversight for various environmental projects.

Carol is a graduate of Kent State University with a degree in Environmental Management Technology. Her certifications include OSHA 40-Hour HAZWOPER, OSHA 8-Hour Annual Refresher, and HAZWOPER Emergency Response – First Responder.

Carol can be reached at (330) 762-6706 or via email at

Mercedes L. Dahler
Mercedes L. DahlerSenior Environmental Geologist
Mercedes Dahler serves as the Senior Environmental Geologist in the Akron, Ohio corporate office. She works directly with the technical staff to ensure quality data analysis and reporting. Her qualifications include Phase I & II Environmental Site Assessments, wetland delineation and permitting, ASTM-compliant soil gas surveys and vapor intrusion assessment, soil and groundwater sampling, groundwater monitoring, remediation, geophysical surveys via ground penetrating radar and EM methods, RCRA closure plans, EPCRA Tier II Reporting, SPCC plans, SWPPP preparation, risk assessments and risk-based closure plans including baseline ERA as well as human health and ecological rick assessments. Mercedes is actively involved in client and contractor interaction, field work, project scheduling and other project management aspects in these arenas

Mercedes is a graduate of The University of Akron with a degree in Environmental Science – Geology. Her certifications include the State of Ohio, Department of Health – Asbestos Hazard Evaluation Specialist, OSHA 40-Hour HAZWOPER, and OSHA 8-Hour Annual Refresher.

Mercedes can be reached at (330) 762-6706 or via email at