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PFAS Signatures in Surface Water due to Petroleum Refinery Wastewater

Communication and Education, Fate and Transport, Forensic Hydrogeology, PFAS, Sediment and Surface Water, Visualization, Wastewater /

This educational video illustrates how per- and polyfluoroalkyl substances (PFAS) enter and move through surface water systems due to wastewater discharges from a petroleum refinery. Using a visually intuitive approach, the video helps viewers understand how different PFAS compounds, including telomers associated with AFFF (aqueous film-forming foam), appear in environmental samples.   Key Topics Covered: […]

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Animation of Leaching Hazardous Waste Landfill

Chlorinated Solvents and DNAPL, Expert Witness and Legal Support, Visualization /

This animation illustrates groundwater pollution caused by improperly buried hazardous waste. It is based on analysis of site chemical and historical data at a Superfund site to identify nature and extent of soil and groundwater contamination due to buried drums of paint sludge. Key hydrogeological and contamination concepts illustrated include:   Leaching of Hazardous Waste

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Hazardous Waste Landfill Investigation and Treatability Study

Chlorinated Solvents and DNAPL, Fate and Transport, Site Assessment and Characterization /

This project included assessment of DNAPL distribution in a hazardous waste landfill and management of a treatability study that included bench tests of enhanced surfactant recovery.   “… he impressed me with his ability to build coherent conceptual models of contamination based on sound analysis and integration of multiple datasets. He was able to describe

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Groundwater Plume Modeling for Remedial Design

Fate and Transport, Modeling, Site Assessment and Characterization, Unique Analytical Methods /

Simulated chemical retardation and biodegradation of benzene and MTBE plume using MODFLOW, MODPATH, and MT3D. Model used as a design tool to define an optimal system layout at JFK International Airport.   Custom analytical tool: Created graphical interface via Excel VBA programming to query a remediation performance database and visualize multi-well extraction system performance.  

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Aquitard Matrix Diffusion Modeling

Chlorinated Solvents and DNAPL, Fate and Transport, Modeling, Site Assessment and Characterization, Unique Analytical Methods /

Identified lines of evidence regarding whether a deep aquifer is impacted by a shallow, contaminated aquifer. Study included X-ray analysis of aquitard clay samples to identify potential secondary pathways for DNAPL migration (such as root holes and burrows), analysis/modeling of advection and matrix diffusion of several chemicals in the aquitard.      

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Hexavalent Chromium Superfund Site – Characterization and Remediation Pilot Test

Chlorinated Solvents and DNAPL, Fate and Transport, Site Assessment and Characterization /

Characterized source and extent of PCE and hexavalent chromium plume that originated at a former metal plating facility. Conducted nanoscale zero-valent iron (nZVI) remediation pilot test. Frequent interaction with USEPA Region II and US Army Corps of Engineers. The site is located in Franklin Square, New York.

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Fractured Bedrock Aquifer Research Site

Fractured Rock Hydrogeology, Modeling, Site Assessment and Characterization, Unique Analytical Methods /

This project included testing and development of traditional and new tools to characterize groundwater flow in fractured crystalline rock, including multi-well pumping tests, downhole flow measurement technologies, downhole fracture detection and borehole geophysical and cross-hole seismic data, and fracture distribution and geometry data. Modeling: Constructed numerical model to simulate groundwater flow, including calibration to pumping

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3D Geologic Visualization for Fractured Rock Aquifer Characterization

Fractured Rock Hydrogeology, Site Assessment and Characterization, Unique Analytical Methods, Visualization /

Used Advanced Visual Systems (AVS) software [not to be confused with EVS] to create a 3-D geologic model of a research site in Raymond, California. The model aided interpretation of borehole geophysical logging data. The research site was funded by the U.S. Department of Energy and U.S. Environmental Protection Agency.   When used judiciously, 3D

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Groundwater Flow Modeling for a Proposed Nuclear Waste Repository

Fate and Transport, Fractured Rock Hydrogeology, Modeling, Unique Analytical Methods /

Used the computer code TOUGH2 (Berkeley National Lab) to construct a 3-D groundwater model of the proposed nuclear waste repository at Yucca Mountain, Nevada. Model accurately represents faulted strata of variable thicknesses, orientations, and displacement along strike. Numerical simulations of the flow downstream from the region directly below the potential repository show that a high

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Conceptual Site Model of Fractured Rock Superfund Site

Chlorinated Solvents and DNAPL, Fate and Transport, Forensic Hydrogeology, Fractured Rock Hydrogeology, Site Assessment and Characterization, Visualization /

Analyzed historical site characterization data and TCE concentration trends to characterize fracture zones in fractured dolostone aquifer and the factors affecting pump and treat system performance. The revised Conceptual Site Model provided the basis for reducing extraction rates and remedial costs. This project exemplifies how a detailed reexamination of existing site data can provide a

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