William Lettis & Associates, Inc.

	William Lettis, Ph.D., P.G., C.E.G., Senior Principal Geologist President Dr. William Lettis, President and Principal Engineering Geologist of William Lettis & Associates, Inc., is a Certified Engineering Geologist in California with over 25 years of professional experience conducting earthquake-related studies.
	Keith Kelson, M.S., P.G., C.E.G., Senior Principal Geologist Vice-President Mr. Kelson has more than 20 years of experience in conducting and managing assessments of seismic hazards and water resources through geologic, paleoseismic, and geomorphologic analyses. His experience includes state-of-the-art research as well as consulting evaluations of dams, lifelines, nuclear facilities, and transportation corridors.
	Jeffrey Unruh, Ph.D., P.G., Senior Principal Geologist Vice-President Dr. Unruh is experienced in applying a variety of disciplines and techniques to solve neotectonic and structural geologic problems, including subsurface analyses, surface geophysics, remote sensing, numerical modeling and field mapping.
	Jeff Bachhuber, M.S., P.G., C.E.G., Senior Principal Engineering Geologist Vice-President Geotechnical Services Mr. Bachhuber is a Registered Geologist and Certified Engineering Geologist in California with over 20 years of domestic and international experience conducting engineering geologic and geotechnical studies and hazard assessments.
	Christopher Hitchcock, M.S., P.G., C.E.G., Principal Geologist Mr. Hitchcock is a Professional Geologist and Certified Engineering Geologist in California experienced in the application of geologic, geomorphic, and hydrologic techniques to seismic hazard and engineering geology investigations. Resume
	John Baldwin, M.S., P.G., C.E.G., Principal Geologist Mr. Baldwin has over 20 years of combined professional and educational experience specializing in neotectonics and engineering and environmental geology.
	Michael Gray, M.S., P.G., C.E.G., Principal Geologist Mr. Gray is a professional geologist and certified engineering geologist with over 20 years of experience in developing, implementing, and managing complex geologic, hydrogeologic, engineering geology, and geotechnical evaluations. Throughout all project development stages, feasibility through construction, Mr. Gray's experience spans a diverse array of projects including nuclear facilities, dams, tunnels and shafts, pipelines, water supply and treatment facilities, as well as transportation corridors.
	Bill Godwin, B.S., P.G., C.E.G., Principal Engineering Geologist Mr. Godwin has over 26 years of field and project management experience supporting engineering geologic investigations and construction across the United States and overseas. He has investigated soft and hard ground tunnels, gas and water pipelines, roads, dams, fossil and nuclear power facilities, schools, and residential and commercial development.
	Michael Angell, M.S., Senior Geologist Mr. Angell is a structural geologist with over 19 years experience conducting geohazard investigations for critical facilities in onshore and marine environments. His expertise is combining structural analysis of faulting and deformation mechanisms with site stratigraphy, geomorphology and regional tectonic setting to determine the origin of ground deformation and assess the potential for future movement.
	Janet Sowers, Ph.D., P.G., Senior Geologist Dr. Sowers is a Professional Geologist (CA) specializing in Quaternary geology, geomorphology, soil-profile development, creek and watershed mapping, and urban hydrology.
	Stephen Thompson, Ph.D., P.G., Senior Geologist Dr. Thompson has conducted regional and site investigations in tectonically active environments to characterize seismic and geomorphic hazards and processes. His experience covers neotectonics, paleoseismology, Quaternary stratigraphy, structural geology, and geomorphology.
	Justin Pearce, M.S., P.G., C.E.G., Senior Geologist Mr. Pearce specializes in surficial processes including fluvial geomorphology, erosion and sediment transport, and flood hydrology. His project experience at WLA includes Quaternary geology, geologic and geomorphic mapping, watershed studies, stream stability issues, characterization of erosion process, and Geographic Information Systems.
	Matt McMackin, Ph.D., Senior Geologist Dr. McMackin has over 20 years of professional experience in education, geologic mapping and site analysis applied to Quaternary geology, neotectonics and structural geology. His experience includes the application of GIS to the preparation of regional geologic maps and databases.
	Robert Givler, M.S., P.G., Senior Geologist Mr. Givler has experience in geologic studies involving seismic hazard analysis and Quaternary geology, engineering geologic/geotechnical studies, geologic mapping, and geographic information systems (GIS).
	David Slayter , M.A., P.G., Senior GIS Analyst Mr. Slayter is a GIS analyst and geologist specializing in the development and application of GIS solutions to the assessment of natural resources. His experience includes GIS project design and spatial analysis, watershed assessments, environmental investigations, risk assessments, and geologic mapping.
	Christopher W. Fuller, Ph.D., Senior Project Geologist Dr. Fuller's background in geodynamics has focused on regional and local studies of active and long-term tectonics and has been based on both field observation and numerical modeling of tectonic processes. Currently his work is focused on seismic source characterization and seismic hazard analyses for critical facilities.
	Özgür Kozaci , Ph.D., Senior Project Geologist Dr. Kozaci specializes in active tectonics, paleoseismology, tectonic geomorphology and Quaternary geochronology. He has applied his expertise for seismic hazard investigations on international pipeline, highway, tunnel, and dam projects. Dr. Kozaci has active fault related research experience in California and internationally.
	Andrew Lutz, M.S., P.G., Project Geologist Mr. Lutz specializes in geomorphic, geologic, and paleoseismic approaches to seismic hazard and engineering geology investigations. His project experience includes hazard analyses and site assessments for pipelines, dams, waterway locks, bridges, and other critical facilities both in California and internationally.
	Kate D. Krug , M.S., Project Geologist Ms. Krug's geologic studies have focused on slope stability analysis and geochemical effects on rock mechanics. Ms. Krug's earth science proficiency includes geologic and geomorphic mapping, volcanology, structural geology, geomorphology, tectonics, geochemistry, and GIS analysis to support geologic, geotechnical, and hazard investigations.

	Scott Lindvall, M.S., P.G., C.E.G., Senior Principal Geologist Vice-President Mr. Lindvall, a Registered and Certified Engineering Geologist in California, has 17 years experience conducting seismic and geologic hazard analyses, fault and paleoseismic investigations, ground motion studies, and engineering geology investigations for both existing and proposed engineering and construction projects.
	Ross Hartleb, Ph.D., Senior Geologist Dr. Hartleb specializes in paleoseismology, tectonic geomorphology, and active tectonics studies. He has applied his expertise to fault studies throughout California and the Middle East. Dr. Hartleb's broad geologic background also includes experience in Quaternary mapping, groundwater hydrology, and fluvial geomorphology.
	Rick Ortiz, M.S., P.G., Senior Project Geologist Mr. Ortiz has experience performing a wide range of geologic studies. His primary areas of expertise focus on fluvial and hillslope geomorphology, sediment transport, watershed analysis, seismic hazard analysis, geologic mapping, sedimentology and stratigraphy. He also has comprehensive knowledge and experience with large scale, field based geotechnical subsurface investigations.

	Dean Ostenaa, M.S., Principal Geologist Mr. Ostenaa has more than 32 years' experience in probabilistic and deterministic seismic hazard investigations, geological site characterizations, and geologically-based flood hazard studies for critical infrastructure.
	Daniel O'Connell, Ph.D., Principal Geophysicist Dr. O'Connell has 30 years' experience in geophysical investigations of earthquake and flood hazards. His expertise includes seismotectonics, seismic source inversion, seismic wave propagation, probabilistic and deterministic seismic hazard investigations, geophysical site characterizations for earthquake engineering, site-specific ground motion modeling, and surface hydrology.
	Roland LaForge, M.S., Senior Geophysicist Mr. LaForge has 25 years of experience in seismological research and seismic hazard analysis. His main areas of expertise are tectonic analysis, seismic source modeling, and probabilistic seismic hazard analysis for critical structures.
	Sean Sundermann, M.S., P.G., Senior Project Geologist Mr. Sundermann specializes in studies of geologic hazards and Quaternary geology integrating multiple techniques within investigations involving tectonic geomorphology, slope stability, neotectonics, Quaternary mapping, subsurface analysis and paleoseismology.
	Seth Dee, M.S., Project Geologist Mr. Dee has experience in geologic studies involving geologic mapping, engineering geology, GIS, sedimentology, structural geology and geological hazard investigations for critical structures.
	Mark Zellman, M.S., GISP, P.G., Project Geologist Mr. Zellman is a project geologist with geotechnical and environmental geology field experiences. Mr. Zellman specializes in applying GIS and Remote Sensing technologies to projects involving geologic hazard assessment, natural resources, and geophysical surveys.

	Robin McGuire, Ph.D., Senior Principal Engineer Vice-President Dr. McGuire has over 25 years experience in development of unique probabilistic seismic hazards software and analysis.
	Gabriel Toro, Ph.D., Senior Principal Engineer Dr. Toro has nearly 25 years experience in probabilistic seismic hazard analysis, development of attenuation equations, probabilistic analysis of soils and their effects on earthquake ground motion, and probabilistic analysis of hurricanes and their wave, wind, and surge effects.
	John Vlasity, M.S., Senior Scientist Mr. Vlasity has 20 years experience in probabilistic seismic hazard analysis for the nuclear power and insurance industries.
	Richard Dobbs, Ph.D., Principal Software Engineer Dr. Dobbs has more than 20 years of experience in mathematical modeling and development of numerical engineering and scientific applications. He supports users of the EZ-FRISK and ST-RISK software packages, and leads the efforts to improve and advance these tools.
	Bingkun Li, Ph.D., Senior Software Engineer Dr. Li has a background in Numerical Analysis and has over fifteen years experience in algorithm research, software development and analysis.

	Kevin Clahan, M.S., P.G., C.E.G., Principal Engineering Geologist Mr. Clahan is a Certified Engineering Geologist in California and has over 17 years of experience specializing in neotectonics, seismic hazard analysis, and engineering geology.

	Frank Syms, Ph.D., P.G., Principal Engineering Geologist Dr. Syms has eighteen years of experience in engineering geology/geotechnical engineering related to geologic and seismic studies for site selection, design and construction of nuclear and critical structures.
	Randolph Cumbest, Ph.D., Principal Geologist Dr. Cumbest has over 20 years of professional experience in structural geology, geochronology and geophysics, in both research and industrial settings. Most recent activities have been related to fault characterization and site characterization for critical facilities.
	Stephanie Briggs, Ph.D., Project Geologist Dr. Briggs's experience includes regional-scale studies of continental deformation and tectonics. She has applied structural geology, geochronology, geochemistry, geophysics, and geomorphology to central Asia, portions of California, and the Appalachians.

	Jason Altekruse, M.S., Senior Staff Geologist Mr. Altekruse has experience in geologic and neotectonic mapping, detrital heavy-mineral provenance in terms of regional tectonics, structural geology, GIS, and satellite image and aerial photo interpretation.
	Cooper Brossy, M.S., Senior Staff Geologist Mr. Brossy has a background in field studies and Quaternary geology. His experience includes geologic and geomorphic mapping of fluvial systems and volcanic terrains and creating geologic interpretive materials to support science-based public lands planning.
	Justin Cox, B.S., Senior Staff Geologist Mr. Cox has experience in geologic studies involving geotechnical sampling, geologic mapping, engineering geology, GIS, sedimentology, coastal processes and geological hazard investigations with nuclear structures.
	Ranon Dulberg, B.S., Senior Staff GIS Analyst Mr. Dulberg has experience including GIS project design and analysis with an emphasis on natural resource management and seismic hazard analysis. He is also experienced in remote sensing with applications including air photo interpretation, digital image processing, land use planning, and environmental monitoring.
	Jason Finley, M.A., Senior Staff GIS Analyst Mr. Finley has a background in meteorology and geography, and focuses on GIS. Recent GIS experience includes analysis and mapping for environmental hazard assessments and spatial analysis of climate circulation patterns in the western U.S.
	Tim Glidden, B.A., Senior Staff Geologist Mr. Glidden has a background in neotectonic and Quaternary geomorphologic field investigation, with experience in remote and surface geologic and geomorphologic mapping, seismic trench investigation, and subsurface petrologic characterization for engineering geologic applications.
	Josh Goodman , M.S., Senior Staff Geologist Mr. Goodman is a Quaternary geologist, with experience related to active strike-slip and blind thrust faults, engineering geology, and landslide hazards. His project experience includes site characterization studies for proposed nuclear facilities, hazardous waste storage facilities, pipelines and commercial developments.
	Jeff Hemphill, M.A., Project GIS Analyst Mr. Hemphill has ten years of GIS experience with specialization in the analysis and mapping for urban landuse related related issues. His research interests span a wide range of GIS topics, but currently focuses on Uncertainty and Multi-scale / Multi-source Quantification of Geologic Hazard.
	Will Huff, B.S., Senior Staff Geologist Mr. Huff has experience in geologic mapping, engineering geology, geotechnical sampling, hydrogeology and GIS as well as some seismic studies involving the foundering of mantle lithosphere beneath the Sierra Nevada batholith.
	Chris Kemp , M.S., Staff Geologist Mr. Kemp has a background in tectonic and geomorphic studies with experience in fluvial and quantitative geomorphology, geologic and geomorphic mapping, paleomagnetism, and GIS applications.
	Allison Shumway, M.S., Senior Staff Geologist Ms. Shumway has a background in geophysics, tectonics, paleoseismology, geomorphology and seismic hazard analysis, with applications to critical facilities across the nation. Ms. Shumway's research has focused on seismic hazards within the New Madrid seismic zone.
	Michael Strane, M.S., Senior Staff Geologist Mr. Strane is experienced in geologic studies involving Quaternary mapping, geographic information systems (GIS) and fault evolution and fault zone characterization for fault hazard studies.
	Marco Ticci, M.S., Senior Staff GIS Analyst Marco Ticci has a background in geology and focuses on GIS, with experience in analysis and geoprocessing of earthquake hazard data. He also has experience in interpretation and processing of aerial photography.
	Jamey Turner, M.S., Senior Staff Geologist Mr. Turner is a staff geologist with experience in geotechnical, environmental, and exploration geology. Mr. Turner's studies have focused on fluvial processes and aqueous geochemistry in alluvial aquifers using hydrologic and hydrogeologic investigations, geologic mapping, geochemical and reaction path modeling, and GIS.
	Robert Turner , M.S., Senior Staff Geologist Mr. Turner has experience conducting Quaternary paleoseosmic studies and the collection and analysis of geotechnical data pertaining to dam safety and other public water infrastructure. He is proficient in geomorphic mapping, trenching, ground penetrating radar surveying and GIS.
	Greg Van Etten, B.S., Senior Staff Geologist Mr. Van Etten has a background in investigating and mapping glacial sediments and processes and conducting engineering geology subsurface investigations utilizing test pits, soil and hard rock coring, and GIS techniques.
	Adam Wade , B.S., Senior Staff Geologist