Gradient

Senior Scientists

Kathleen A. Radloff, Ph.D.
Email VCard Bio

Education

Ph.D. Earth and Environmental Engineering, Columbia University

B.A. Chemistry, Mount Holyoke College

Water Science and Policy Certificate International Women's University (Germany)

Expertise

  • Contaminant Fate & Transport
  • Aqueous Geochemistry
  • Lead, Arsenic, and Metals
  • Groundwater Hydrology
  • Risk-based Remediation

    Kathleen A. Radloff, Ph.D.

    Senior Environmental Engineer

    Email VCard Bio

    Dr. Radloff is an environmental engineer specializing in the geochemistry, fate, and transport of environmental contaminants.  Dr. Radloff has used her technical expertise for  the characterization of contaminated aquifers, risk-based exposure assessment, site remediation, environmental liability assessment, and litigation support.  She has experience with a wide range of contaminants including trace metals, pesticides, chlorinated solvents, and PCBs.  Her doctoral work focused on arsenic fate and transport in Bangladesh and specifically investigated how arsenic mobility restricted viable drinking water options in rural areas.  Prior to graduate school, Dr. Radloff worked on human health risk and exposure assessment as an environmental health analyst at Gradient.

    Education

    Ph.D. Earth and Environmental Engineering, Columbia University

    B.A. Chemistry, Mount Holyoke College

    Water Science and Policy Certificate International Women's University (Germany)

    Expertise

    • Contaminant Fate & Transport
    • Aqueous Geochemistry
    • Lead, Arsenic, and Metals
    • Groundwater Hydrology
    • Risk-based Remediation

      Representative Projects

      Mining Site Remedial Strategy Development: Evaluated contaminants in soil, surface water, and sediments to facilitate a remedial strategy at a former mining site contaminated with metals in South America. Characterized the different soil and groundwater types to identify mining operations from local background conditions.  Conducted geochemical modeling in support of remedial design.

      Metal Contamination of River Sediment: Assessed potential sources of metal contamination of sediment in a tidally influenced river, including industrial discharges and municipal stormwater, in response to a citizen’s lawsuit under the Clean Water Act. Researched sediment transport dynamics in an estuary and geochemical processes that influence metal deposition in sediments. Provided a comprehensive review of potential sources and the processes that influence the metals contamination in sediments.

      LEAF Overview and Implications: Prepared an overview of the US EPA’s Leaching Environmental Assessment Framework (LEAF) to an industry group, including a summary of the methods and how US EPA intends to use information. Reviewed the potential implications of expanded use and adoption of the Framework to other jurisdictions.

      Groundwater Characterization in Coal Mining Region: Provided litigation support concerning levels of metals in groundwater and drinking water in a coal mining region. Evaluated metal concentrations observed in drinking water relative to local naturally occurring levels.

      Source Investigation of Lead in Mining Runoff: Evaluated potential sources and contributing factors to the recent appearance of lead in runoff from mining operations, including designing an analytical study of materials used in the mine.  Reviewed extensive surface water analyses with specific attention given to changing conditions that may contribute to the release and mobilization of lead.

      Hydraulic Fracturing Fluids Constituents Evaluation:  As part of an evaluation of the potential for hydraulic fracturing (HF) of deep shale formations to affect potable aquifers, reviewed various state guidelines of drilling activities and the incidence of spills and violations.  Performed preliminary review of several HF additives and their anticipated mobility in the subsurface.

      Selected Publications

      Radloff, KA; Zheng, Y; Stute, M; Weinman, B; Bostick, B; Mihajlov, I; Bounds, M; Rahman, MM; Huq, MR; Ahmed, KM; Schlosser, P; van Geen, A.  2016. "Reversible adsorption and flushing of arsenic in a shallow, Holocene aquifer of Bangladesh." Appl. Geochem.

      van Geen, A; Bostick, BC; Trang, PTK; Lan, VM; Mai, NN; Manh, PD; Viet, PH; Radloff, K; Aziz, Z; Mey, JL; Stahl, MO; Harvey, CF; Oates, P; Weinman, B; Stengel, C; Frei, F; Kipfer, R; Berg, M.  2013. "Retardation of arsenic transport through a Pleistocene aquifer." Nature 501 : 204-207.

      Radloff, KA; Zheng, Y; Michael, HA; Stute, M; Bostick, BC; Mihajlov, I; Bounds, M; Huq, MR; Choudhury, I; Rahman, MW; Schlosser, P; Ahmed, KM; van Geen, A.  2011. "Arsenic migration to deep groundwater in Bangladesh influenced by adsorption and water demand." Nat. Geosci. 4 : 793-798.

      van Geen, A; Radloff, KA; Aziz, Z; Cheng, ZQ; Huq, MR; Ahmed, KM; Weinman, B; Goodbred, S; Jung, HB; Zheng, Y; Berg, M; Trang, PTK; Charlet, L; Metral, J; Tisserand, D; Guillot, S; Chakraborty, S; Gajurel, AP; Upreti, BN.  2008. "Comparison of arsenic concentrations in simultaneously-collected groundwater and aquifer particles from Bangladesh, India, Vietnam, and Nepal." Appl. Geochem. 23 : 3244-3251.

      Radloff, KA; Cheng, ZQ; Rahman, MW; Ahmed, KM; Mailloux, BJ; Juhl, AR; Schlosser, P; van Geen, A.  2007. "Mobilization of arsenic during one-year incubations of grey aquifer sands from Araihazar, Bangladesh." Environ. Sci. Technol. 41 : 3639-3645.