Alexandra Meyers, MPH, BCES

Consultant

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Relevant Experience
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Bio

Ms. Alexandra Meyers is a human health risk assessor with 15 years of technical experience in the fields of environmental health science and exposure assessment. She has provided regulatory and litigation support for private clients and public agencies for contaminated sites throughout the U.S. Ms. Meyers has managed a wide variety of projects, including baseline human health risk assessments, screening and remedial goal evaluations, and vapor intrusion assessments. She has experience evaluating the potential health impacts associated with PFAS, PCBs, chlorinated solvents, dioxins and furans, PAHs, TPHs, and metals through multimedia exposures. Her extensive experience in leading human health risk assessments is focused on understanding the uncertainty and variability in exposure patterns and how that influences risk characterization results.

Relevant Experience

Human Health Risk Assessment

Human Health Risk Assessment for a Former Manufactured Gas Plant Facility, Illinois — Performed a streamlined baseline risk assessment for the upland areas of a former manufactured gas plant (MGP) facility adjacent to the Chicago River in coordination with EPA and Illinois EPA. The streamlined assessment expediated regulatory concurrence by comparing the exposure point concentrations to risk-based screening levels to characterize risk for current and future receptors who may be exposed to MGP-related chemicals in site soils or in indoor air.

Tribal Exposure Assessment for a Reservation, Minnesota — Evaluated tribal lifeway exposures to develop a conceptual site model. Reviewed food energy requirements of tribal members who rely on indigenous diets to determine food consumption rates. Determined ingestion rates for fish, wild rice, produce, and terrestrial and aquatic wildlife.

Exposure Assessment for Floodplain Soil, New York — Developed site-specific exposure assumptions for central tendency and reasonable maximum exposure scenarios for residential, recreational, and worker populations, including agricultural, construction, and utility workers. Also evaluated produce, dairy, and beef consumption exposures due to PCBs in soil.

Groundwater Evaluation for Non-potable Purposes at a RCRA Landfill and Solid Waste Facility, Ohio — Evaluated offsite residential exposure to 1,4-dioxane in groundwater used for non-potable activities. Among exposure routes, ingestion of homegrown produce irrigated with well water posed the greatest potential risk. Calculated a health protective concentration for 1,4-dioxane in well water using EPA methods. Compared groundwater concentrations to site specific risk-based screening levels. The analysis demonstrated that groundwater was safe for all non-potable uses.

Feasibility Study for a Mine Tailings Site, Arizona — A flotation mill historically processed ore material from the late 1870s through 1960s, resulting in the formation of two mine tailing piles. Performed a human health risk assessment to support an early response action and the remedy selection process for the feasibility study. The risk assessment evaluated exposure to lead, arsenic, and vanadium in surface soil of residential properties following soil removal actions.

Human Health Risk Assessment for a Landfill, Ohio — Evaluated offsite residential exposure to chemicals in groundwater through drinking water and irrigation use, or consumption of homegrown produce irrigated with groundwater. Assessed potential vapor intrusion into residences from groundwater or landfill gas.

Human Health Risk Assessments and Remedial Action Completion Reports for U.S. Department of Defense, Vandenberg Air Force Base, California — A portfolio of 10 different project sites required a human health risk addendum evaluating unrestricted, residential site closure. Project sites were previously evaluated under a restricted, industrial site use scenario. Reviewed historical data to ensure risk calculations reflect current, post-remediation conditions. Also developed remedial action completion reports that indicated successful completion of the unrestricted site use requirements to allow for site closure.

Risk-Based Cleanup Level Development for a Former Railyard, Vermont — Derived site-specific risk-based cleanup levels for a railyard worker assuming potential exposure to PAHs and arsenic following the Vermont Department of Environmental Conservation’s Investigation and Remediation of Contaminated Properties Rule.

Screening Level Assessment for a Manufactured Gas Plant, Montana — Compared site data to Montana-specific criteria following the Montana Department of Environmental Quality’s Voluntary Cleanup and Redevelopment Act program. Prepared an environmental assessment documenting the results of the evaluation.

Technical Review of a Human Health Risk Assessment for a Former Battery Recycling Facility, California — Reviewed a human health risk assessment for data adequacy, conceptual site model exposure assumptions, risk conclusions, and the associated uncertainties used to inform risk management decisions. Provided a technical report summarizing findings based on the historical site activities that led to aerial deposition of lead in the surrounding community.

Technical Review of Human Health Risk Assessments and Background Risk Evaluation for a Former Pulp Mill Superfund Site, Montana — Reviewed and submitted comments to EPA on the draft assessments highlighting the need for further evaluation of background risks distinctive of site-related risks. Revised the risk assessment by comparing site data to background to narrow the chemicals of concern requiring remedial action.

Human Health Risk Assessment Work Plan and Report for a Former Creosote Wood Treatment Facility Superfund Site, North Carolina — Developed a human health risk assessment work plan in close collaboration with EPA and the North Carolina Department of Environmental Quality (NCDEQ). After receiving NCDEQ approval, prepared human health risk assessment reports for each of the operable units. The evaluations focused on exposure to site soils by residential, commercial, and recreational receptors. Chemicals of potential concern for the site include dioxins and furans, PAHs, and pentachlorophenol.

Recreational Evaluation for a Former Creosote Wood Treatment Facility RCRA Site, Missouri — Evaluated exposures to chemicals detected in surface water by recreational users and unhoused individuals living adjacent to the site along the river.

Remedial Goal Development for a Former Creosote Wood Treatment Facility Superfund Site, Virginia — Finalized risk evaluation by responding to EPA comments on the draft human health risk assessment. Drafted groundwater cleanup goals that met groundwater remedial action objectives.

Revised Cleanup Performance Standard for a Superfund Site, North Carolina — Executed a human health risk assessment to reevaluate the EPA record of decision for a former Superfund site. The revised risk assessment outlined a new performance standard based on potential inhalation of 1,2-dichloroethane groundwater vapors by an outdoor worker rather than a leaching to groundwater protection pathway, which is not reflective of human health exposure.

Site Redevelopment for a Rapid Transit Station, California — Led a baseline and residual soil risk evaluation, which informed site managers of the current and long-term risks associated with site redevelopment. The residual evaluation developed exposure point concentrations based on soil samples that were expected to remain in place after site redevelopment.

Human Health Risk Assessment for a Chemical Distribution Facility, Missouri — The site owner voluntarily entered into an abatement order on consent with the Missouri Department of Natural Resources as part of the remedial investigation. Evaluated risks and hazards to site workers, offsite residents, and recreational receptors from exposures to soil, groundwater, surface water, and sediment at the site and adjoining property. Drafted health-based remedial goals.

Reporting Limit Evaluation for an Industrial Chemical Facility, Georgia — Prepared a site-specific human health risk evaluation to evaluate exposure by an outdoor site worker to direct contact with soil and inhalation of vapors and fugitive dust based on exposure to the reporting limit of trimethylamine in soil.

Gasoline Retail Facilities Portfolio, Pennsylvania and District of Columbia — Evaluated petroleum hydrocarbon exposures at former and current gasoline service stations under Pennsylvania’s Act 2 Land Recycling Program. Also evaluated construction worker exposure to volatile chemicals in a trench. For District of Columbia sites, completed the required Risk-Based Corrective Action Tier 1 and Tier 2 forms.

PFAS

PFAS Groundwater Exposure at a Former Solvent and Waste Reprocessing Facility Superfund Site, New Jersey — Performed a baseline human health risk assessment to evaluate hypothetical future use of groundwater by offsite residential receptors. Potential PFAS groundwater exposures were the primary risk drivers. The offsite residential community received drinking water from a municipal water supply; therefore, this hypothetical future evaluation supported risk management decisions.

Dermal Exposure to PFAS in Firefighting Apparel, United States — Characterized potential dermal risks and hazards for firefighters when wearing apparel treated with PFAS. The evaluation required a review of available dermal absorption rates and refinement of exposure assumptions to conservatively estimate potential health impacts.

Integral’s PFAS Regulatory Dashboard Webinar — Speaker at Integral-hosted webinar demonstrating applicability of the PFAS regulatory dashboard through a case study example. The case study highlighted PFAS groundwater screening level derivation differences between federal and state criteria.

Human Health Risk Assessment Strategy Development, Alabama — Applied Alabama guidance to develop a human health risk assessment framework for a portfolio of project sites. The strategic framework established site-specific soil screening levels for PFAS. This approach enabled expedited screening across the portfolio to prioritize sites requiring interim actions to reduce risks.

Technical Review of a Human Health Risk Assessment for a Waste Disposal Site, Alabama — Evaluated a human health risk assessment report to improve regulatory acceptance and establish a precedent-setting approach for assessments at other project sites. Potential PFAS soil exposures were the primary chemicals of potential concern. The review focused on exposure assumptions for each environmental medium, informed by the conceptual site model and the nature and extent of historical contamination.

Vapor Intrusion

Vapor Intrusion Assessment for a Daycare Facility in a Disadvantaged Community, California — A daycare center serving low-income, bilingual children closed over potentially unsafe levels of volatile organic compounds in indoor air, and could not reopen until proven safe for reoccupancy. Developed site-specific indoor air and soil vapor screening levels based on occupants’ exposure patterns. Compared maximum detected concentrations to these screening levels to determine current and hypothetical future vapor intrusion risks.

Multiuse Residential and Commercial Property Vapor Intrusion Assessment, California — A mixed-use residential and commercial property historically operated as a dry-cleaning facility, with preliminary data exceeding state regulatory screening values. Developed a conceptual site model to identify potential exposure pathways; volatile organic compounds in indoor air emerged as the primary concern. Performed a vapor intrusion assessment using a multiple-lines-of-evidence approach consistent with California Department of Toxic Substances Control guidance.

School Vapor Intrusion Assessment, Virginia — Evaluated multiple rounds of paired sub-slab and indoor air data to determine seasonal effects of vertical vapor migration beneath the school building. Provided a risk communication memorandum summarizing the results.

Indoor Air Background Inventory at an Industrial Facility, San Francisco, California — An industrial warehouse showed elevated concentrations beneath its slab from an adjacent chlorinated groundwater plume. The warehouse stores and maintains mechanical equipment using many consumer products containing volatile organic compounds. Inventoried all onsite products and identified background sources impacting indoor air quality apart from subsurface contamination.

Risk Communication for a Residential Property, San Francisco, California — Indoor air concentrations at a residential property exceeded default residential criteria, although the tested area served as a storage unit. Provided a risk communication memorandum to the property owner presenting the screening evaluation outcomes and alternative scenarios evaluating reduced exposure scenarios.

Litigation Support

Litigation Support Regarding PCB Exposures, Confidential Locations — Provided exposure assessment for several litigation projects involving PCBs identified in sediment, surface water bodies, fish tissue, and breast milk. The analysis evaluated exposure to nursing infants, tribal receptors, anglers, and recreational users.

Litigation Support Regarding Volatile Chemicals in Ambient Air, Louisiana — Provided project management and technical support on the fate and transport of volatile chemicals emitted by a municipal landfill and detected in ambient air. The analysis identified chemicals warranting further investigation based on exceedances of EPA health-protective screening levels.

Litigation Support Regarding Site Sampling and Remedial Goal Derivation, Ohio — Sampled surface soil to further delineate the nature and extent of contamination. The objective of sample collection was to evaluate natural and anthropogenic background sources to revise site-specific remedial goals.

Litigation Support Associated with a Natural Resource Damage Assessment of a Former Mine, Washington — Conducted a comprehensive review of previous trustee and responsible party injury estimates for surface water and vegetation assessment areas. Implemented refinements to the service loss area estimates based on additional data considerations.

Product Stewardship

Toxicity Assessment of a Consumer Product Ingredient, United States — Reviewed available toxicity data for a food coloring dye found to be present in a cosmetic product. Calculated the potential consumer exposure dose based on product application recommendations.

Product Safety Assessment of a Consumer Product, United States — Completed a consumer product exposure assessment estimating dermal and systemic exposures based on product application instructions. Characterized risk by comparing estimated consumer exposures to the appropriate adverse effect thresholds.