Individual Staff Information

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Lesley Sebol

Environmental Geology
1801 19th Street
Golden, CO 80401
Phone: 303-384-2633

Specialties: Hydrogeology, Ground Water, Water Quality, Environmental Science

Sebol, L.A., Barkmann, P., Johnson, E., Fitzgerald F.S., and Curtiss, W., 2016, Geology, Groundwater Resources, and Water Quality of Park County, Colorado:  Geological Society of America annual meeting, Abstracts with Programs, Vol., 48, No. 7, doi: 10.1130/abs/2016AM-286609.

Barkmann, P.E., Sebol, L.A., Fitzgerald F.S., and Curtiss, W., 2015, Geology and Groundwater Resources of Park County, Colorado Geological Survey, Open File Report 15-11.

Barkmann, P.E., Fitzgerald F.S., Sebol, L.A., Curtiss, W. Pike, J. Moore, A., and Taylor, B., 2015, Geology and Groundwater Resources of Douglas County, Colorado Geological Survey, Open File Report 15-10.

Sebol, L.A., Robertson, W.D., Busenberg, E., Plummer, L.N., Ryan, M.C., and Schiff, S.L., 2007, Evidence of CFC degradation in groundwater under pyrite-oxidizing conditions, J. of Hydrology, Vol. 347: 1-2 (15 Dec.), pp. 1-12.

Sebol, L.A., Evaluating Shallow Groundwater Age Tracers:  Br-, CFCs, 3H/3He, SF6, and HCFCs/HFCs, 2005, Ph.D. dissertation, Earth Sciences Dept., University of Waterloo.

Sebol, L.A., Robertson, W.D., and Schiff, S.L., 2002, Determination of the Age of Groundwater Contamination Using CFCs in Waterloo, Ontario, Proceedings in the 55th Canadian Geotechnical and 3rd Joint IAH-CNC and CGS Groundwater Specialty Conferences, Niagara Falls, Ontario, pp. 1093-1100, October 20-23.

Sebol, L.A., Robertson, W.D., Schiff, S.L. and Rudolph, D., 2001, Determination of Groundwater Age Using CFCs at the Thornton Well Field, Woodstock, Ontario, Proceedings in the 54th Canadian Geotechnical and 2nd Joint IAH-CNC and CGS Groundwater Specialty Conferences, Calgary, Alberta, pp. 1093-1100, September.

Sebol, L.A., Determination of Shallow Groundwater Age Using CFCs in Three Shallow Aquifers in Southern Ontario, 2000, M.S. dissertation, Earth Sciences Dept., University of Waterloo.

Current Projects

  • Monitoring and Remediation of LUST sites
  • County Groundwater Studies


Research Interests

  • Contaminant Hydrogeology
  • Environmental Science
  • Water Quality
  • Evaluating Nature & Extent of Contamination
  • Contaminant Fate & Transport
  • Environmental Site Assessments, Remediation, and Monitored Natural Attenuation
  • Landfill Monitoring
  • Evaluating Groundwater Redox Geochemistry
  • Groundwater Age Determination



Colorado Geological Survey, Geologist-Hydrogeologist (2014-present)

Toeroek Associates Inc., Hydrogeologist, Sr. Environmental Scientist (2013-2014)

Golder Associates Inc., Senior Project Hydrogeologist, 2005-2013

Loureiro Associates Inc., Hydrogeologist (1992-1997)

YWC Inc., Hydrogeologist (1990-1992)

Heynen Engineers, Geologist (1987-1990)


Ph.D., Hydrogeology, University of Waterloo, 2005

M.S., Hydrogeology, University of Waterloo, 2000

M.S., Environmental Science, University of New Haven, 1991

B.S., Geology, University of Maryland, 1986



Professional Geologist – Colorado, as defined in C.R.S. 23-41-208

Professional Geologist – Wyoming (applied, waiting for exam)

Professional Geoscientist – Ontario (since 2006)

Professional Associations

National Ground Water Association (NGWA)