Shawn C. Leppert
Principal Hydrologist
As Principal Hydrogeologist, Mr. Leppert is responsible for identifying and applying practical hydraulic, hydrogeochemical, and geologic analysis methods for the characterization of subsurface environments. Mr. Leppert uses his considerable experience in assessing environmental impacts of contaminants found in soil and groundwater in the design of goal oriented subsurface investigative programs. He is involved in projects from “cradle to grave”. Using appropriate engineering principles, Mr. Leppert oversees the design, evaluation, and implementation of site-specific mitigating measures for contaminants of concern. He is accustomed to working in heavily scrutinized settings. Mr. Leppert is practiced at the communication of complex scientific and engineering analysis results using state of the art presentation techniques.
Mr. Leppert has twenty-five of complex groundwater flow systems and the transport of contaminants within those systems. His experience includes the detailed evaluation of separate-phase contaminants, both Dense and Light Non-Aqueous Phase Liquids (such as fuels, solvents, and oils). Mr. Leppert is adept in developing remediation/control systems to address contaminated groundwater and the associated soil profile. His project experience includes design of detection monitoring systems, evaluation of remediation system effectiveness, remedial system design, and assessment of risk using fate and transport techniques. He is thoroughly versed in the use of state of the art computer simulators for a wide variety of subsurface environments. His computer programming skills as well as his background in defensible, statistically based uncertainty analysis provides added value to accomplishing investigation objectives both accurately and in a timely fashion.
Education and Professional Qualifications
· M.S. in Hydrology, New Mexico Institute of Mining and Technology, Socorro, New Mexico, 1990
· B.G.S. in Geology, New Mexico State University, Las Cruces, New Mexico, 1986
· Safety-Kleen 40-hour OSHA Hazardous Materials Health and Safety Training Course and Annual 8-Hour HAZWOPER Refresher Course
· Dissolved Organic Contaminants in Groundwater, Innovative Technologies for Site Characterization & Plume Remediation. Waterloo Centre for Groundwater Research, April 1995
· Multi-Phase Contaminant Transport Course. Taught by Jack Parker et al., Tampa Florida, December 1991
· Subsurface Remediation: Improving Long-term Monitoring and Remedial System Performance, USEPA, St. Louis, Missouri, June 1999.
· Practical Issues in the use of Probabilistic Risk Assessment and its Application to Hazardous Waste Sites, NIEHS/USEPA, Sarasota, Florida, March 1998.
· Remediation of Chlorinated and Recalcitrant Compounds, The First International Conference, organized by Battelle, Monterey, California, May 1998.
Employment Summary
· Leppert Associates, Golden, Colorado, Owner and Principal Hydrogeologist, 2000 – present.
· Safety-Kleen Consulting Services, Boulder, Colorado. Hydrogeologist I - Principal Hydrogeologist, 1991-1999.
· Southwest Florida Water Management District, Brooksville, Florida. Hydrologist II, 1990.
Publications and Presentations
Leppert, S.C., 1999. “The Power of Statistically Based Soil Sampling and Analysis: Maximizing Information While Minimizing Costs.” Workshop taught as part of the West Coast Conference on Contaminated Soils and Groundwater, Oxnard, California.
Leppert, S.C., 1999. “Environmental Statistics as a Decision Tool.” Workshop taught as part of the West Coast Conference on Contaminated Soils and Groundwater, Oxnard, California.
Leppert, S.C., Edwards, J.C., and Vogler, K.J., 1998. “Diesel Floating at the Water Table May Not Adversely Impact Groundwater Quality.” Presented at the West Coast Conference on Contaminated Soils and Groundwater, Association for the Environmental Health of Soils, Oxnard, California.
Leppert, S.C., Welsh, R.J., and Lynn, S.M., 1997. “Coupling Environmental Fate and Transport Analysis with Toxicological Risk Analysis Using a Monte Carlo Technique.” Proceedings for the 13th Annual Conference on Contaminated Soils, University of Massachusetts, Amherst, Massachusetts.
Leppert, S.C., Jones, B.G., Fagan, T., and Edwards, J.C., 1996. “An Application of Monte Carlo Techniques for Environmental Fate and Transport Modeling: Obstacles, Solutions, and Results.” Proceedings for the 12th Annual Conference on Contaminated Soils, University of Massachusetts, Amherst, Massachusetts.
Leppert, S.C., Jones, B.G., Pinkerton, C., and McDermott, J., 1995. “Evolution of Passive Remedial Alternatives Coupled with Flow Barriers for the Remediation and Control of LNAPL Plumes.” Proceedings for the 11th Annual Conference on Contaminated Soils, University of Massachusetts, Amherst, Massachusetts.
Leppert, S.C., 1994. "Modeling The Future: The Role Predictive Groundwater Modeling Can Play in the Control and Remediation of Contaminants (abs)." Presented at NGWA's 46th Annual Convention and Expo's Groundwater Remediation: Existing Technology and Future Direction Program, Las Vegas, Nevada.
Leppert, S.C., Jones, B.G., and Mast, M.K., 1994. "Transient Five-Spot Injection Withdrawal In-Situ Soil and Groundwater Washing: Theoretical Development." Proceedings for the International Ground Water Modeling Center's 1994 Modeling Conference, Fort Collins Colorado.
Leppert, S.C., Jones, B.G., Mast, M.K., and Slayman, B., 1993. "Model Conceptualization: Uncertain Aspects of Model Development." Proceedings for the International Ground Water Modeling Center's 1993 Modeling Conference, Golden, Colorado.
Leppert, S.C., Mast, M.K., 1992. "Particle Tracking: An Effective Tool for Trench Remediation Analysis? A Case Study." Proceedings of the 1992 Petroleum Hydrocarbons and Organic Chemicals in Ground Water: Prevention, Detection, and Restoration, Houston, Texas.
Leppert, S.C., Jones, B.G., and Mast M.K, 1992. "A Comparison of Precise Semi-Analytical Particle Tracking Techniques to Numerical Techniques in the Evaluation of Remediation Systems (abs)." Presented at the Twelfth Annual American Geophysical Union's Hydrology Days.
Leppert, S.C. and Bengtsson, T., 1990. "Comparison of Density-Coupled Transport Codes for a Saltwater Intrusion Study in Coastal West-Central Florida (abs)." Presented at the American Geophysical Union's Fall Meeting, San Francisco, California.
Leppert, S.C., 1989. "Capture Zones in Transient Flow Fields: Simulations and Analysis." Thesis, New Mexico Institute of Mining and Technology, Socorro New Mexico.
Linderfelt, William R., Leppert, Shawn C., and Wilson, John L., 1989. "Capture Zones for Well-Head Protection: Effect of Time Dependent Pumping, Saturated thickness and Parameter Uncertainty (abs)." Presented at the American Geophysical Union's Fall Meeting, San Francisco, California.
Wilson, John L., Linderfelt, William R., and Leppert, Shawn C., 1989. "The Influence of Streams, Barriers, Groundwater Divides and Other Hydrological Features on Well Capture Zones (abs)." Presented to the 28th International Geological Congress, Washington, District of Columbia.
Mclemore, V.T., North, R. M, and Leppert, S.C., 1988. "Rare Earth Elements in New Mexico." New Mexico Geology, volume 10(2), pp 33-38.
Contact Information
SLeppert@leppertassociates.com
(303) 216-2428
1422 Washington Ave.
Golden, CO 80401