Mr. Mannix has 20 years of experience in contaminant hydrogeology and geophysical assessment at hundreds of sites in the eastern United States. For the past 10+ years, he has been providing consulting services primarily in Massachusetts and other New England states, with a focus on source delineation and characterization, assessment of current and potential future human health and environmental impacts, implementation of appropriate remedial technologies, and compliance with local, state, and federal regulations. He has been responsible for technical direction and regulatory compliance during investigations and remedial activities that included removal of underground storage tanks and petroleum-impacted soil, subsurface investigations using various drilling and sampling methodologies, remediation programs involving several remedial technologies, and report preparation in accordance with Massachusetts, New Hampshire, and New York regulatory programs. Activities also included managing client’s reimbursement claims under state petroleum reimbursement programs. Mr. Mannix has also provided expert witness testimony in deposition and trial in a multi-million dollar lawsuit for a major oil company.

While at EndPoint, Mr. Mannix has conducted and managed numerous environmental investigation and remediation projects throughout New England including source delineation and characterization; fate and transport evaluation; assessment of impacts and risk to human and environmental receptors; selection and implementation of remedial designs; and state and federal regulatory compliance. Mr. Mannix has conducted and supervised field activities including boring and monitoring well installation programs; soil, sediment, surface water and ground water sampling; and various subsurface techniques to estimate the future extent of contamination and associated human health and environmental risks. Mr. Mannix has also performed litigation support activities and provided expert testimony for a case involving a release from a bulk fuel oil storage facility, identification of oil related to the release, subsurface transport of non-aqueous phase liquid (NAPL) in soil.


B.S., University of Connecticut, 1995. Geology and Geophysics


Massachusetts Licensed Site Professional


VAPOR INTRUSION ASSESSMENTS: Conducted vapor intrusion assessments at sites with volatile organic compounds in soil or groundwater near occupied structures. These included residential homes, industrial facilities, gasoline service stations, bulk fuel oil and gasoline storage facilities, dry cleaning facilities, and sites where future structures were proposed to be built. Chemicals present in soil and groundwater were identified, and sites determined to have no significant risk of impacts to indoor air from subsurface environmental media were not carried further in a vapor intrusion assessment. Sites that had the potential for a vapor intrusion pathway were further assessed by identification of potential sources, collection of indoor air and ambient air samples for laboratory analysis, further assessment of preferential flow pathways, and comparing the chemistry of indoor air to that of soil, groundwater, and soil vapor. Sites with confirmed or suspected vapor intrusion pathways were further assessed using Massachusetts Department of Environmental Protection (MassDEP) risk characterization procedures to evaluate potential human health impacts, as described in Human Health Risk Assessment below.

HUMAN HEALTH RISK ASSESSMENTS: Conducted Method 1, Method 2, or Method 3 Risk Assessments at sites including single-family homes, duplexes, apartment complexes, gasoline service stations, bulk fuel storage facilities, dry cleaners, police stations, fire stations, air fields, former manufactured gas plant (MGP) facilities, and more. Utilized guidance documents published by the respective state entity or by the United States Environmental Protection Agency (USEPA) to assure approval by the governing entities. Identified hazards under current and potential future site uses, verified exposure assumptions and chemical toxicities, researched chemical profiles, identified exposure points, and calculated exposure point concentrations. Summarized cumulative human health risk considering multiple exposure scenarios, combining soil, groundwater, and indoor air exposures.


National Ground Water Association
American Institute of Hydrology
Massachusetts Licensed Site Professional Association