David M. Tuck

Experience

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  EDI Engineering & Science

  Nov 1981 - May 1986

  Environmental Consultant

  - Designed pump-and-treat remediation systems for contaminant plumes at five industrial sites using analytical and numerical ground water models- Served as subject matter expert for computer software (analytical ground water models and spreadsheets)- Supervised geologists and technicians during acquisition of hydrogeologic and geophysical field data- Wrote business development proposals for projects ranging from $50K to $250K- Wrote Phase I technical evaluations and geologic reports for several coal tar contaminated sites - Major contributing author of a 1982 report evaluating wetlands protection regulations and policy for US EPA Show less

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  Princeton University

  Aug 1986 - Sept 1992

  Research Assistant/Teaching Assistant

   Conducted experimental and theoretical research on immiscible displacement during multiphase flow in porous media; research spanned Geological and Geophysical Sciences and Civil Engineering Departments- Developed a numerical model to simulate diffusion-limited sorption kinetics for organic contaminants- Published papers and gave several presentations on DNAPL behavior in porous media- Supervised teaching assistants for introductory geology labPh.D. Thesis: Immiscible Displacement of Residual Tetrachloroethylene from Saturated and Unsaturated Porous Media Show less

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  ARCO Oil and Gas Company

  May 1990 - Aug 1990

  Intern

  Developed experimental technique to image pore level distribution of three fluid phases. Involved issues of multiple fluid miscibility, polymer selection as fluid-phase analogs to preserve miscibility and viscosity relationships, and high pressure flow experiments in glass micromodels to evaluate polymers Developed theory explaining change in heavy oil recovery pattern during light hydrocarbon flooding from decreasing recovery with increasing methane content to increasing recovery at methane content exceeding 25% providing rationale for lower cost enhanced oil recovery technology Show less

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  Westinghouse Savannah River Company

  Sept 1992 - Aug 1999

  Senior Scientist

  ­- Successfully designed and managed field-test for innovative, passive DNAPL recovery technology with low operating costs. This included design and implementation of a bench-scale laboratory test­- Modeled pore-scale DNAPL migration during primary drainage incorporating dynamic interfacial tension. Demonstrated that dyed DNAPL has similar surface chemical properties to a real, field DNAPL­- Conceived, proposed, and managed a collaborative project with Pacific Northwest National Laboratory to transform a small-scale (sub-centimeter resolution) permeability distribution outcrop map into a map of DNAPL entry pressures­- Initiated and supervised measurement of a commonly used organic dye's surface activity and partnered with the University of South Carolina-Aiken to study its effects on DNAPL multiphase flow visualization studies­- Developed collaboration with Princeton University to study gravity driven DNAPL flow during surfactant flushing using synchrotron radiation to simultaneously measure DNAPL saturation and estimate DNAPL-water interfacial tension in situ during lab-scale experiments­- Developed model for contaminant recovery from heterogeneous aquifers based on analogy with charge transport in disordered solids, and established its validity with 15 years of operating data from SRS pump-and-treat system­- Published papers and gave several presentations on DNAPL behavior in porous media Show less

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  University of South Carolina Aiken

  Aug 1993 - May 1999

  Adjunct Professor

  - Developed and delivered ground water flow and contaminant transport class titled "Environmental Hydrogeology”- Supervised and conducted research on organic dye influence on pore entry pressure in porous media- Supervised and directed undergraduate research on grain morphology influence on intrinsic permeability

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  NAPLogic, LLC

  Aug 1999 - Jul 2022

  Senior Hydrogeologist & Remediation Design

  Provide hydrogeological & geochemical consulting services for industrial & municipal clients- Saved client >$150K in characterization and remediation costs by demonstrating multichlorinated benzene contamination was from an off-site source. Developed a detailed conceptual site model in a glacial lake setting including deltaic deposition and tidal influences, Developed an innovative technique to extrapolate hydraulic conductivity data based on simplified geologic modeling, and created a new analytical model for temperature-dependent biodegradation for incorporation into a 2-D analytical transport model- Salvaged data from a 21-day aquifer study including a 5-day pumping test in tight formation by applying water level modeling to remove effects of tidal influences and heavy rainfall events that overwhelmed the pumping results. Data analysis demonstrated tidal confinement of contamination. Additional analysis supported natural attenuation of chlorinated solvent contaminants coupled with BTEX in a deeper zone and concomitant hydraulic control due to tidal cycles.- Designed and implemented a five-well SVE system with de-watering pumps controlled by transducers. Made the automatic control possible by recognizing the reference pressure for the transducers had to be within the well, i.e., the vacuum pressure. The system recovered between 152 and 162 kg of BTEX in 8 months and allowed site closure. Recognized that failure of ISCO at the site had been due to insufficient geological characterization and incorrect interpretation of dissolved iron concentrations, allowing development of remedial approach.- Maximized the value of characterization data in fractured bedrock geology at a dry cleaner site by correlating PID readings with laboratory analyses making detailed concentration profiles possible.- Delivered presentations at national groundwater conferences and published papers on the role of dynamic surface chemistry in DNAPL mobility in porous and fractured media Show less

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  ECC

  Mar 2022 - now

  Senior Hydrogeologist