1. Joan M. Gaidos, Ph.D.
Senior Environmental Scientist
Dr. Gaidos has over 17 years of experience in environmental and reproductive sciences.
Since 2001, she has served as a technical editor and reviewer supporting the U.S.
Environmental Protection Agency/Office of Pesticide Programs (EPA/OPP) interpreting
data on the fate and transport, the ecotoxicological effects, and the human toxicity of
pesticides. For the last 6 years, she has interpreted and analyzed data concerning the
antimicrobial and endocrine disrupting effects of pesticides. She has assisted in
preparation of fate, ecological and human health risk assessments. Dr. Gaidos has 7 years
of experience managing large-scale field projects and laboratory work assessing
agricultural crop and soil systems, fertilizer transport, and reproductive parameters in
livestock. She has a thorough understanding of statistical analytical approaches and
environmental computer models.
Pesticide Fate and Effect
Technical Editor, Reviewer and Quality Control Manager, EPA/OPP/Environmental
Fate and Effects Division (EFED), Technical Support for Assessment of Ecological
Effects and Fate and Transport of Pesticides in the Environment Contracts. Dr.
Gaidos’ responsibilities include the overall review, compilation and statistical evaluation
of data, and technical editing of chemical and biological data pertaining to the fate and
transport of potentially hazardous materials in terrestrial and aquatic ecosystems and
assessing the potential impact and exposure. Dr. Gaidos has been responsible for, or
assisted with, the delivery of more than 800 Data Evaluation Records (DERs) involving
pesticides and antimicrobial agents, prepared or assisted with more than 12 risk
assessments, some accompanied by a Drinking Water Memo, 6 library search/retrievals,
and 300 Data Input Sheets (DISHs). Dr. Gaidos has also trained and assisted others in
performing this work.
Dr. Gaidos’ primary responsibilities include editing and conducting primary and secondary
reviews of studies on the environmental fate, dissipation and transport of pesticides
submitted as part of the registration or re-registration process. This includes determining
the adequacy of the experimental design, sampling protocols, and analytical methods;
whether study results are sufficient to draw conclusions; adherence to guideline
objectives; perform statistical analysis of data, including calculating linear and nonlinear
half-lives. Studies reviewed include the chemical and biological degradation of pesticides
in various media, leaching of pesticides through soil and into groundwater, runoff into
surface water bodies, volatilization of pesticides under laboratory and field conditions,
and accumulation of pesticides by plants and fish. Dr. Gaidos provides technical direction,
supervision and expert advice to other reviewers performing these reviews and
extensively utilizes spreadsheets and statistical programs such as Excel and Sigma Plot. Dr.
Gaidos has reviewed and edited, and trained and supervised others, for the entire suite of
environmental fate studies including: hydrolysis, aquatic and soil photolysis, aerobic and
anaerobic soil metabolism, soil column leaching, aerobic and anaerobic aquatic
metabolism, field dissipation, ground water monitoring and field volatility.
Education
Ph.D. - Crop and Soil
Environmental Science,
Virginia Tech,
Blacksburg, Virginia,
2001
M.S. - Reproductive
Physiology, University
of Kentucky, Lexington,
Kentucky, 1991
B.S. - Animal
Science/Biology,
Virginia Tech,
Blacksburg, Virginia,
1988
Honors/Awards
American Association
for the Advancement of
Science (AAAS) Mass
Media Science and
Engineering Fellow,
2001
National Outstanding
Extension Publication,
1996
Education
Ph.D. - Crop and Soil
Environmental Science,
Virginia Tech,
Blacksburg, Virginia,
2001
M.S. - Reproductive
Physiology, University
of Kentucky, Lexington,
Kentucky, 1991
B.S. - Animal
Science/Biology,
Virginia Tech,
Blacksburg, Virginia,
1988
Honors/Awards
American Association
for the Advancement of
Science (AAAS) Mass
Media Science and
Engineering Fellow,
2001
National Outstanding
Extension Publication,
1996

2. Joan M. Gaidos, Ph.D.
Dr. Gaidos performs statistical analysis of data using CETIS, TOXSTAT, and SAS software
programs to calculate LD/LC50, ECx, NOAEC, and LOAEC values, and train and supervise
others in performing these tasks. Studies reviewed include the entire suite of
acute/chronic aquatic and terrestrial, plant, animal and insect studies, as well as acute,
sub-chronic, and chronic avian and mammalian reproductive toxicity, mutagenicity,
neurotoxicity, oncogenicity, and enzyme biochemistry of pesticides, as well as
summarizing studies from open literature.
Dr. Gaidos critically analyzed and incorporated statistical data into fish short-term
reproduction assay (FSTRA) studies and obtained valid assessment of toxicity endpoints
obtained in accordance with OPPTS statistical framework and guidance related to
endocrine disruption of pesticides in support of the Endocrine Disruptor Screening
Program (EDSP). She assisted in the validation and QC review of a new client-initiated
web-based platform for the review of Ecotoxicology studies pertaining to endocrine
disruption. Dr. Gaidos utilized beta-test web-based platform for study review and
provided quality control feedback to the client concerning completeness, validity, and
ease-of-use.
Dr. Gaidos has served as the QA/QC officer for the past 9 years, ensuring that the Quality
Assurance Project Plans (QAPPs) for the contract and for individual work assignments are
followed. She confirms that each DER undergoes technical editing and proofreading for
typographical/grammatical errors, that significant errors are corrected and documented,
and ensures timely and high quality work.
Dr. Gaidos has been responsible for training other scientists in the proper techniques for
developing, conducting and reporting studies to meet the Federal Insecticide, Fungicide,
and Rodenticide Act (FIFRA) guideline requirements, the Food Quality Protection Act
(FQPA), and the Pesticide Registration Improvement Act I and II (PRIA). Dr. Gaidos also
handles Confidential Business Information (CBI) material and is thoroughly familiar with
FIFRA CBI requirements. She has managed and provided technical support on human
health and ecological risk assessments supporting the Comprehensive Environmental
Response, Compensation, and Liability Act and Resource Conservation and Recovery Act
(CERCLA/RCRA) programs. She has reviewed pesticide and antimicrobial studies to
support the Clean Water Act (CWA) and the Safe Drinking Water Act (SDWA).
Task Leader, Technical Editor and Reviewer, EPA/OPP/Environmental Fate and
Effects Division (EFED), Technical Support for Antimicrobial Effects of Pesticides in
the Environment. For this subcontract with ICF, International, Dr. Gaidos managed task
assignments, maintained budgets, and produced monthly reports. She performed technical
editing and review of studies and science chapters on the environmental fate of
antimicrobial products. Her duties included maintaining working relationships with key
individuals, management and co-workers to ensure open communication and accurate and
timely completion of task assignments.
Technical Editor and Reviewer, Health Canada’s Pest Management Regulatory
Agency (PMRA), Review of Environmental Data in Support of Canadian Registration
of Pest Control Products. Dr. Gaidos performed similar tasks performed for the
EPA/OPP/EFED contracts described in the preceding sections.
Technical Editor and Reviewer, EPA/OPP/Health Effects Division, Toxicity (Human)
of Pesticides Contract. Dr. Gaidos critically reviewed research data on the acute,
subchronic, and chronic toxicity, mutagenicity, neurotoxicity, oncogenicity, and enzyme

3. Joan M. Gaidos, Ph.D.
biochemistry of more than 50 pesticides. Test species included a variety of
microorganisms, mice, rats, hamsters, dogs, and primates.
Related Pesticide and Fate Experience
Dr. Gaidos critically reviewed and compiled data related to pesticide labels and
formulations, and directed a database project summarizing chemical registration status.
To improve the review process and data quality, Dr. Gaidos provided input and produced
memos revising the handling of pesticide data such as clarifying the calculation of Kf
values, and detailing the use of Sigma Plot in calculating non-linear half-lives to resolve
inadequacies of linear half-life calculations in describing the degradation of pesticides in
some instances. Dr. Gaidos provided input to improve the DER format and analysis to
coordinate more efficient integration into risk assessments, and discussed regulations,
processes and policies internally. She assisted with implementation of the EPA “Workshop
on Population-level Ecological Risk Assessment,” coordinating over 35 attendees for the 3-
day workshop and summarizing several sessions related to technical and policy issues.
As a subcontractor, Dr. Gaidos performed statistical evaluation of data collected in support
of updated McGuire AFB Base-wide Background Study. Dr. Gaidos recommended sampling
strategy for statistically viable data sets based on review of data sets and supporting
documentation from previous background study and background study from neighboring
Ft. Dix. She provided supporting documentation and review of regulatory guidance for
proposed statistical analysis, performed statistical evaluation of appropriate data sets
from previous background study and data sets collected for the updated background study
using ProUCL. Dr. Gaidos interpreted and summarized statistical evaluation for inclusion
in final base-wide background study report including comparisons with regional
contaminant levels and regulatory exposure limits.
Dr. Gaidos is experienced with developing literature searches for fate and ecotoxicology
topics, including keyword search strategies using electronic databases such as Agricola,
Biosis, Cambridge Scientific Abstracts, AGRIS, Biological and Agricultural Index, Zoological
Record and others at locations such as the National Agricultural Library, Library of
Congress, John’s Hopkins Medical Library. She has trained and supervised others in
performing these searches.
Risk Assessment
Technical Editor and Reviewer, EPA/OPP/Environmental Fate and Effects Division
(EFED), Technical Support for Assessment of Ecological Effects and Fate and
Transport of Pesticides in the Environment Contracts. Dr. Gaidos prepared or assisted
with more than 12 risk assessments, including integrating pesticide fate, dissipation and
transport, pesticide use, exposure, and ecological data to characterize risk of pesticides in
accordance with current OPP policies and guidance. She critically evaluated soil and water
sampling procedures, data quality, statistical analysis, and contaminant fate and transport
modeling to determine major routes of dissipation, degradation patterns and
transformation products, and estimate exposure through air, soil, and ground and surface
water. Computer modeling programs such as PRZM/EXAMS and SCI GROW2 were also
used to estimate pesticide effects and risks and make comparisons with other predictive
models and laboratory data. Dr. Gaidos reviewed more than 10 small and large scale water
monitoring studies and data sets in order to estimate pesticide fate under field conditions
and determine risk to ground and surface waters. Results from these types of studies are
compared with estimates from predictive models and laboratory studies. Dr. Gaidos

4. Joan M. Gaidos, Ph.D.
trained and directed other staff to assist in preparing risk assessments and statistically
analyze large data sets from monitoring studies.
Senior Scientist, U.S. EPA Region 2, RAC2, Remedial Action Contract. As senior
scientist, Dr. Gaidos prepared the fate and transport and pesticide risk assessment in the
Final Screening Level Ecological Risk Assessment for the Pesticide Warehouse III, OU1
(Soil) in Manati, Puerto Rico. Tasks included preparation of technical reports assessing
pesticides in soil based on collected site data from an abandoned pesticide warehouse in
Puerto Rico, including responsibly for evaluation and interpretation of data of pesticide
soil residues.
Senior Scientist, Bureau of Land Management. As senior scientist, Dr. Gaidos supported
the development and evaluation of Environmental Assessments (EAs) for the Bureau of
Land Management regarding for the effects of fire on soils in several western states. Tasks
included preparation of technical reports assessing cyanide in soil after aerial application
of fire-retardant in southeastern Idaho, including responsibly for statistical analysis,
interpretation of topographical maps and GIS data, overall evaluation, and presentation of
data.
Fellowship
Mass Media Science and Engineering Fellow for the American Association for the
Advancement of Science (AAAS). As an AAAS Fellow, Dr. Gaidos researched and wrote
science and environmental articles and columns for major mid-Atlantic newspaper
(circulation 230,000) based on trends in science and environmental policies and issues
using embargoed research from science journals, news releases and medical reports.
Laboratory and Field Research
Research Assistant, Virginia Tech, Crop and Soil Environmental Science Department.
As a graduate research assistant, Dr. Gaidos designed and conducted large farm field
experiments measuring yield and nitrate leaching, using over 300 ceramic suction
lysimeters in no-till winter wheat at over 16 sites in the Virginia Coastal plain. Tasks
included integrating data from moisture probes, weather stations, crop coefficients, and
lysimeters to estimate nitrate concentrations in soil-water over time and estimate
potential risks to ground and surface waters. Dr. Gaidos analyzed data, and developed
graphics and supporting material utilized for policy development by state government
agency (Department of Conservation and Recreation). She worked cooperatively with
state and national agencies (USDA-NRCS) in technical workgroups to finalize the
development and validation of a computer nitrate-leaching model (NLEAP) including
interpretation of GIS output. She wrote, summarized and edited articles about complex
scientific principles for peer groups and non-scientists through proposals, research
reports, extension publications, peer-reviewed journal articles, field days, and state and
national professional and industry meetings. Completion of research tasks involved the
collection and analysis of hundreds of plant tissue, soil and water samples, and extensive
utilization of computer software; Excel, Sigma Plot, Word, SAS, JMP, PowerPoint and
others. Dr. Gaidos utilized literature searches extensively to develop scientific reports and
data sets. She served as a graduate teaching assistant and lectured for undergraduate soil
and environmental science classes and laboratories, summarizing technical issues, policies
and literature related to environmental science.
Research Assistant, University of Kentucky, Department of Animal Science. As a
graduate research assistant, Dr. Gaidos performed blood sampling and serum analysis for

5. Joan M. Gaidos, Ph.D.
hormones and other metabolites in horses, cattle, sheep and swine. She conducted various
serum and tissue analysis and radioimmunoassay, worked in sterile conditions and with
radioactive materials, and assisted with surgical and other procedures including
ovarectomies, superovulations, artificial inseminations and gastrointestinal probe
insertion. Dr. Gaidos served as a graduate teaching assistant and lectured for numerous
undergraduate animal science, nutrition and production classes and laboratories.
Research Laboratory Assistant, University of Kentucky, Alzheimer’s Disease Center.
As a research laboratory assistant, Dr. Gaidos maintained human brain and skin cell
cultures for Alzheimer’s research. She prepared culture media, maintained a sterile field
and incubation condition, kept data records, and assessed tissue development.
Professional Community Service
Extension Agent, Virginia Cooperative Extension. A key element of Dr. Gaidos' position
as an extension agent in both Virginia and Kentucky was to develop and maintain
relationships with many different interest groups. A regular part of this process was
managing and supporting the involvement of stakeholders of the Extension Service such as
representatives from local and state governments and agencies, business leaders, and
adult volunteers to coordinate county, regional and state policies, and develop programs
and events to meet local and state Extension missions and goals. Responsibilities included
actively involving stakeholders in the development of programs, inviting participation in
the decision-making process, and creating missions and goals for local and state programs.
Dr. Gaidos developed curriculum and teaching material to deliver agricultural and natural
resource educational programs to over 500 youth and 100 adults on a monthly basis.
Tasks included supervising 2 paid staff and over 100 adult volunteers annually. Dr. Gaidos
managed over 800 youth and adults annually for a wide range of programs and events
including: livestock shows, fairs, interstate exchange programs, public speaking contests,
day and week-long camps, leadership programs, and more. She served on county, state
and regional committees as a participating member or chair, and reported and edited
weekly news articles, newsletters and reports for public and administrative audiences.
Specialty/Technical Courses
2014 Technical Workshop on Antimicrobial Efficacy Test Methods and Activities, EPA
Laboratories, Fort Meade, Maryland, February 19, 2014.
CETIS: Introduction to using CETIS statistical software in support of the Ecotoxicological
Effect of Pesticides, EPA, Crystal City, Virginia, 2012.
Field Volatilization of Pesticides: Computer Modeling Workshop, EPA, Crystal City, Virginia,
2005.
Terrestrial Field Dissipation Workshop, EPA, Crystal City, Virginia, 2002.
Mass Media Science Writing Workshop, American Association for the Advancement of
Science (AAAS), Washington, DC, 2001.
Nitrate Leaching and Economic Analysis Package (NLEAP) Computer Model Development,
Assessment, and Validation. Fort Collins, Colorado, 2000.
Professional Activities
National Association of Science Writers

6. Joan M. Gaidos, Ph.D.
Agronomy and Soil Science Society of America
Selected Publications and Presentations
Gaidos, J.M, and Werner. P. (2003). Assessment of soil cyanide concentrations after aerial
application of Fire-Trol®
LCG-R fire retardant to wildland site in southeastern Idaho. U.S.
Department of Interior, Bureau of Land Management and National Office of Fire and
Aviation Management. Boise, Idaho.
Gaidos, J.M. 2001. Pollution study-up close: Better forecasting is the goal. Richmond
Times-Dispatch. http://www.atmos.umd.edu/~umdair/MGBSB4ID6OC.html.
Gaidos, J.M. 2001. Fuel cells offer increased efficiency with almost no emissions. Richmond
Times-Dispatch. www.nanosonic.com/files/18.pdf.
Gaidos, J.M. and Alley, M.M. (2000). Nitrogen management for no-till winter wheat.
Virginia Cooperative Extension Publication. Virginia Tech, Blacksburg, Virginia.
Gaidos, J.M., Alley, M.M., and Roygard, J.K. (2000). Influence of nitrogen fertilization rate
and timing on no-till wheat yields and nitrate leaching in the Virginia Coastal Plain. ASA-
CSSA-SSSA Annual Meetings, Minneapolis, Minnesota.
Gaidos, J.M. and Schafer, J. (1999). Nitrate leaching in no-till cropping systems.
Groundwater Pollution Primer, Civil Engineering Department, Virginia Tech, Blacksburg,
Virginia.
http://www.cee.vt.edu/ewr/environmental/teach/gwprimer/group06/base.htm.
Gaidos, J.M., Alley, M.M., Khosla, R., and Hammons, J.L. (1998). Nitrogen application rate
and timing influence on no-till wheat yields in the Virginia Coastal Plain. ASA-CSSA-SSSA
Annual Meetings, Baltimore, Maryland.
Gaidos, J.M., Alley, M.M., and McKenna, J.K. (1997). Virginia’s agroecosystems. Virginia
Cooperative Extension.
Gaidos, J.M., Schillo, K.K., Hileman, S.M., and Duren, S.A. (1992). Hormonal and metabolic
changes associated with sexual maturation in yearling fillies. American Society of Animal
Science-Southern Section, Lexington, Kentucky.
Gaidos, J.M., Schillo, K.K., and Hileman, S.M. (1991). Validation of radioimmunoassay for
cortisol in equine serum. Diagnostic Systems Laboratories, Inc. Technical Report.
Gaidos, J.M., Alley, M.M., and Roygard, J.K. (2000). Influence of nitrogen fertilization rate
and timing on no-till wheat yields and nitrate leaching in the Virginia Coastal Plain. ASA-
CSSA-SSSA Annual Meetings, Minneapolis, Minnesota.
Gaidos, J.M. and Schafer, J. (1999). Nitrate leaching in no-till cropping systems.
Groundwater Pollution Primer, Civil Engineering Department, Virginia Tech, Blacksburg,
Virginia.
http://www.cee.vt.edu/ewr/environmental/teach/gwprimer/group06/base.htm.
Gaidos, J.M., Alley, M.M., Khosla, R., and Hammons, J.L. (1998). Nitrogen application rate
and timing influence on no-till wheat yields in the Virginia Coastal Plain. ASA-CSSA-SSSA
Annual Meetings, Baltimore, MD.

7. Joan M. Gaidos, Ph.D.
Gaidos, J.M., Alley, M.M., and McKenna, J.K. (1997). Virginia’s agroecosystems. Virginia
Cooperative Extension.
Gaidos, J.M., Schillo, K.K., Hileman, S.M., and Duren, S.A. (1992). Hormonal and metabolic
changes associated with sexual maturation in yearling fillies. American Society of Animal
Science-Southern Section, Lexington, Kentucky.
Gaidos, J.M., Schillo, K.K., and Hileman, S.M. (1991). Validation of radioimmunoassay for
cortisol in equine serum. Diagnostic Systems Laboratories, Inc. Technical Report.