David I. Thal, CQA, CEAC, CFS

Principal Chemist
865.376.7590
Knoxville, TN
dthal@envstd.com
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Professional Experience
Mr. Thal has more than 28 years of diversified experience in the field of environmental chemistry. This experience includes research design; oversight of laboratory and inter-laboratory research; development, validation, and application of advanced analytical methods; and laboratory technical management, quality assurance project planning, and consultation on the development of data quality objectives for environmental studies.  He specializes in the design, management, and evaluation of laboratory studies involving sediment, tissues, soil, and waters; studies focused on contaminant bioavailability of and on source identification and source allocation of mixed contaminants.  He also has experience in studies of ambient air, stack gas, and multi-media samples.  He has developed and executed site-specific analytical plans for sites in all US EPA regions, meeting the requirements of the US EPA Office of Water, US EPA Office of Solid Waste and US EPA Office of Air Quality programs and has conducted many successful projects meeting CERCLA, RCRA, DoD, and DOE requirements.

Mr. Thal has extensive experience in supervising and performing US EPA and ASTM analytical methods and method validation.  He participated in the inter-laboratory validation of US EPA and ASTM methods for analysis of polychlorinated dioxins and furans, polychlorinated biphenyls and polyaromatic hydrocarbons.  He has participated in several laboratory inter-comparison exercises with the National Institute of Standards and Technology.  He participates on the ISO Technical Advisory Group, setting international standards for the analysis of persistent, bioaccumulating, and toxic compounds in water.  He also participates on the Interstate Technology and Regulatory Council.

He has provided technical planning, supervision, and program management for several multi-million dollar analytical projects involving up to five laboratories, applying innovative strategies and new, high-performance methods.  Examples include the New York/New Jersey Contaminant Assessment and Reduction Program TMDL Study, the New Orleans Inner Harbor Navigation Canal Dredged Material Management Study, and the Lower Passaic River Restoration Project Low-Resolution Coring Study.

Certifications
Mr. Thal is a Certified Environmental Analytical Chemist through the National Registry of Certified Chemists.

Memberships
Mr. Thal is a member of the American Chemical Society, American Society for Testing and Materials, Society of Environmental Toxicology and Chemistry, Interstate Technology and Regulatory Council, International Society for Environmental Forensics, and the NELAC Institute.

Education
Mr. Thal received a Bachelor of Science degree in Psychology in 1976 and Bachelor of Science Degree in Chemistry in 1988 from University of Tennessee at Chattanooga. He has also completed graduate-level course work in research design.

Valley Forge, PA
610.935.5577
Charlottesville, VA
434.293.4039
Knoxville, TN
865.376.7590
Santa Fe, NM
505.660.8521
Chicago, IL
630.262.3979
Charleston, SC
843.469.5867
Cherry Hill, NJ
304.552.1442

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